Sound Devices Astral ARX8
4-, 6-, and 8-Channel, True-Diversity Receiver
with SpectraBand Technology
User Guide v8.30
Astral ARX8 User Guide Introduction
2
Contents
Chapter 1: Introduction ................................................................................................................................................................................................ 4
1.1 Key Features .................................................................................................................................................................................................. 4
1.2 SpectraBand .................................................................................................................................................................................................. 5
1.3 Digital Wireless Modulation ............................................................................................................................................................................ 5
1.4 NexLink Wireless Transmitter Control ............................................................................................................................................................. 5
1.5 GainForward .................................................................................................................................................................................................. 5
1.6 Safety Information .......................................................................................................................................................................................... 7
1.7 Architectural Overview .................................................................................................................................................................................... 8
Chapter 2: Panel Views ............................................................................................................................................................................................... 9
2.1 Front Panel ..................................................................................................................................................................................................... 9
2.2 Rear Panel ................................................................................................................................................................................................... 10
2.3 Bottom Panel ................................................................................................................................................................................................ 11
Chapter 3: Typical Setup ........................................................................................................................................................................................... 11
Chapter 4: Quick Start ............................................................................................................................................................................................... 13
Chapter 5: Powering .................................................................................................................................................................................................. 16
5.1 Powering when Astral ARX8 is standalone (not docked to an 8-Series) ........................................................................................................ 16
5.2 Powering when Astral ARX8 is docked to an 8-Series .................................................................................................................................. 16
5.3 Power – DC Outputs..................................................................................................................................................................................... 16
Chapter 6: Navigating the User Interface ................................................................................................................................................................... 17
Chapter 7: RX Views ................................................................................................................................................................................................. 19
7.1 All View ........................................................................................................................................................................................................ 19
7.2 4RX View ..................................................................................................................................................................................................... 20
7.3 1RX View ..................................................................................................................................................................................................... 22
Chapter 8: Menus ...................................................................................................................................................................................................... 28
Chapter 9: TX List ..................................................................................................................................................................................................... 29
9.1 Pairing an Astral Transmitter to the Astral ARX8 .......................................................................................................................................... 29
9.2 Pairing via USB ............................................................................................................................................................................................ 29
9.3 Wireless Pairing ........................................................................................................................................................................................... 30
9.4 Unpairing / Handoff ...................................................................................................................................................................................... 31
9.5 TX List Description ....................................................................................................................................................................................... 31
9.6 Assigning a Paired Transmitter to a Receiver Channel ................................................................................................................................. 31
9.7 TX View ........................................................................................................................................................................................................ 32
Chapter 10: TX Group Control ................................................................................................................................................................................... 33
Chapter 11: RF Menu ................................................................................................................................................................................................ 34
11.1 Antenna Setup ............................................................................................................................................................................................ 34
11.2 Tuning Band ............................................................................................................................................................................................... 35
11.3 RF History .................................................................................................................................................................................................. 35
11.4 Antenna Length .......................................................................................................................................................................................... 35
Chapter 12: Antenna RF Overload Indication ............................................................................................................................................................ 36
Chapter 13: Spectrum Analyzer ................................................................................................................................................................................. 37
13.1 RTSA Mode ................................................................................................................................................................................................ 37
13.2 Scan Mode ................................................................................................................................................................................................. 40
Astral ARX8 User Guide Introduction
3
13.3 Exclusion Regions ...................................................................................................................................................................................... 41
Chapter 14: AutoAssign............................................................................................................................................................................................. 42
Chapter 15: Audio Outputs ........................................................................................................................................................................................ 43
15.1 Routing ....................................................................................................................................................................................................... 43
15.2 Audio Out Sample Rate .............................................................................................................................................................................. 44
15.3 Audio Out Sync Reference ......................................................................................................................................................................... 44
15.4 Tone Generator .......................................................................................................................................................................................... 44
15.5 Audio Meters .............................................................................................................................................................................................. 44
Chapter 16: Timecode ............................................................................................................................................................................................... 45
16.1 Syncing Astral transmitters to Astral ARX8 timecode. ................................................................................................................................. 45
Chapter 17: NexLink Menu ........................................................................................................................................................................................ 46
17.1 NexLink Status Alerts ................................................................................................................................................................................. 46
Chapter 18: System Menu ......................................................................................................................................................................................... 47
18.1 Pair to Astral Remote App (Locale Settings) ............................................................................................................................................... 47
18.2 Country ...................................................................................................................................................................................................... 47
18.3 Syncing Astral Remote’s Country, Date, & Time to Astral ARX8. ................................................................................................................ 48
18.4 Frequency Authorization ............................................................................................................................................................................. 49
18.5 Miscellaneous Settings ............................................................................................................................................................................... 50
Chapter 19: Quick Setup Menu ................................................................................................................................................................................. 52
Chapter 20: Updating Firmware ................................................................................................................................................................................. 54
20.1 Firmware Update Status ............................................................................................................................................................................. 55
20.2 Aborting a Firmware Update ....................................................................................................................................................................... 55
20.3 Refresh List ................................................................................................................................................................................................ 55
Chapter 21: Channel Expansion Licenses ................................................................................................................................................................. 56
Chapter 22: Accessories ........................................................................................................................................................................................... 57
22.1 Included...................................................................................................................................................................................................... 57
22.2 Optional ...................................................................................................................................................................................................... 57
22.3 Astral QuickDock for 8-Series ..................................................................................................................................................................... 58
22.4 Monarch Antenna ....................................................................................................................................................................................... 62
22.5 Astral RX Shelf ........................................................................................................................................................................................... 62
22.6 Astral 2.4G Ant+Mount ............................................................................................................................................................................... 63
Chapter 23: Restricted Frequency Authorizations ...................................................................................................................................................... 64
Chapter 24: Connector Pin Assignments ................................................................................................................................................................... 65
Chapter 25: Specifications ......................................................................................................................................................................................... 67
25.1 Astral ARX8 Specifications ......................................................................................................................................................................... 67
25.2 Monarch Specifications .............................................................................................................................................................................. 70
Chapter 26: Note on RF Interference ......................................................................................................................................................................... 71
Chapter 27: Servicing the Astral ARX8 ...................................................................................................................................................................... 71
Chapter 28: Warranty ................................................................................................................................................................................................ 71
Chapter 29: Legal Notices ......................................................................................................................................................................................... 72
Chapter 30: Declaration of Conformity ....................................................................................................................................................................... 75
Astral ARX8 User Guide Introduction
4
Chapter 1: Introduction
The Astral ARX8 is an ultra-high performance, multichannel wireless microphone receiver in a compact ½-rack wide chassis. It features 4
independent, true-diversity channels that can be expanded to 6 or 8 true-diversity channels via software license. The Astral ARX8 features NexLink,
an innovative concept in wireless microphone receivers: full remote control of microphone transmitters via an integrated, long-distance RF link.
The Astral ARX8 is ideal for use in a portable bag setup or mounted in a standard 19-inch rack. Additionally, the Astral ARX8 can be docked to
Sound Devices 833, 888, or Scorpio mixer-recorders using the Astral QuickDock accessory, which provides convenient power, audio, and timecode
connections with no additional cables. This accessory allows the Astral ARX8 to connect and disconnect from the 833, 888, or Scorpio in seconds
with no tools.
1.1 Key Features
● 4-channel ultra-high-performance, true-diversity receivers in a ½ rack size (8.0” x 6.6” x 1.6”).
● Expandable to 6 or 8 channels via 2-channel expansion licenses.
● 169 MHz – 1525 MHz tuning range via SpectraBand Technology.
● Compatible with Astral transmitters including the Astral Mini and Astral TX bodypacks and Astral HH handheld.
● NexLink: integrated, long-distance remote control of all wireless transmitters, including group transmitter control.
● Integrated Real Time Spectrum Analyzer (RTSA) and scanner for visualization of RF activity. TV Channel Finder included.
● AutoAssign: automatic deployment of clean frequencies in seconds.
● Flexible powering: via DC input, 8-Series, or AC mains (with optional adapter).
● DB-25 connector for 8 channels of mic, line, or AES outputs.
● Wide, 6.2” color OLED array with touch for control and monitoring.
● Astral QuickDock allows docking and undocking in seconds from 8-Series mixer-recorders with no tools.
● Supports GainForward Architecture: No gain setting on the Astral transmitter. Adjust gain at the receiver or mixer.
● 100% digital long-range modulation delivers the longest transmission distance of any digital system on the market.
● RF SAW filters for excellent rejection of interference from nearby IFB or camera hop transmitters.
● Excellent audio quality, full 10 Hz – 20 kHz audio bandwidth.
● BNC timecode input for auto timecode sync of transmitters over NexLink.
● Front panel and rear panel BNC antenna inputs. Compatible with passive and bias-powered antennas.
● Supports control of the Wisycom LFA smart antenna.
● Cascade out option on rear BNCs for cascading multiple Astral ARX8 units.
● USB-A port for thumb drives, keyboards, transmitter pairing, and timecode syncing. Supports USB hubs.
Our friendly and knowledgeable support team, based in the USA and the UK, is here for all your questions and comments.
Astral ARX8 User Guide Introduction
5
1.2 SpectraBand
The Astral ARX8 incorporates SpectraBand, a technology that enables the Astral ARX8 to tune over a super wide range of 169-1525 MHz. Tuning
within this range varies by country.
For instance:
In the USA, the available frequency ranges are:
● The VHF band (169-216 MHz)
● The entire UHF TV band (470-608 MHz)
● The 600 MHz guard band (614-616 MHz)
● The 600 MHz duplex gap (653-663 MHz)
● The 900 MHz ISM Band (902-928MHz)
● The 950 MHz STL Band (941.5-960 MHz)
● The 1.5 GHz AFTRCC band (1435-1525 MHz), with an appropriate license.
In the UK, the available frequency ranges are:
● The VHF band (173-210 MHz)
● The core UK UHF TV band (470-702 MHz)
● The 800 MHz duplex gap (823-832 MHz)
● The 800 MHz guard band (863-865 MHz)
● The DME bands (961-1015 MHz, 1045-1075 MHz, 1105-1154 MHz), with an appropriate license.
● The IMT band (1518-1525 MHz)
Please see https://www.sounddevices.com/available-frequencies/ for further detailed information on which frequency ranges are available for each
country.
Tuning Bands
SpectraBand’s 169-1525 MHz range is divided into multiple, tightly filtered tuning bands. The sharp attenuation at either end of a tuning band’s
range significantly reduces out of band interference resulting in excellent range performance.
1.3 Digital Wireless Modulation
Long Range, Standard, and T&M (Test and Measurement) Modulation
The Astral wireless products offer three proprietary digital modulation schemes that provide unbeatable range, unrivaled audio quality, and very low
latency. Modulation schemes can be selected on a per-receiver-channel basis. Long Range modulation has better sensitivity which results in better
range. T&M (Test and Measurement) modulation has been specifically optimized for the flattest frequency response and phase response possible to
very accurately measure the phase and frequency response of loudspeaker arrays in indoor and outdoor venues. The modulation setting must
match between the transmitter and the Astral ARX8 for the transmitted signal to be received and decoded.
Intermodulation Immunity
Because the Astral digital RF transmission is inherently resistant to intermodulation, multiple A10 and Astral Digital Wireless systems can be used
simultaneously on nearby adjacent frequencies without significant worry of intermodulation interference. Systems can be used together when
separated by at least 400 kHz. When operating in the 902-928 MHz Band, it is recommended to separate channel frequencies by at least 1 MHz.
1.4 NexLink Wireless Transmitter Control
NexLink is a proprietary 2.4 GHz bidirectional wireless data link technology that allows multiple Astral transmitters to be controlled, monitored, and
timecode synced from an Astral ARX8 over long distance. NexLink is designed to offer robust and reliable control over distances far exceeding that
of the wireless audio transmission, even in the presence of Wi-Fi and Bluetooth interference. An Astral ARX8 can pair with up to 64 NexLinked
transmitters. Astral transmitters include the Astral Mini, Astral TX, and Astral HH.
1.5 GainForward
The Astral ARX8 supports the Astral transmitter’s GainForward feature. GainForward eliminates the need to adjust microphone preamplifier gain at
the wireless transmitter. Audio levels from the transmitter are controlled either directly from the 8-Series (or any other mixer) trim controls, or from
the Astral ARX8 receiver screen. If the talent speaks too softly or emotes too loudly after being “wired” with the transmitter, simply adjust the
transmitter gain with the mixer’s gain trim, instead of having to access the actual transmitter. Read more about GainForward at:
https://www.sounddevices.com/gainforward-explained/
Astral ARX8 User Guide Introduction
6
When an Astral ARX8 receiver channel is receiving signal from an Astral transmitter, adjust the receiver channel’s gain, low cut, and polarity from its
associated 1RX view.
When the Astral ARX8 is docked on an 8-Series, the Astral ARX8’s gain, low cut, and polarity settings are bypassed and hidden. In this case, adjust
the 8-Series’ trim, low cut and polarity gain as necessary. See the 8-Series User Guides for more information.
Astral ARX8 User Guide Introduction
7
1.6 Safety Information
All the safety and operating instructions should be read before the product is operated.
WARNING: To reduce the risk of fire or electric shock or damage, do not expose this product to rain or moisture.
The product should not be exposed to dripping or splashing or be used near water (e.g. in a bathroom, a kitchen, wet basement or near a swimming
pool etc.…) Similarly, do not place objects containing liquids on this product as care should be taken to prevent objects and liquids from entering the
product.
RETAIN INSTRUCTIONS: These safety and operating instructions should be retained for future reference.
HEED WARNINGS: All warnings on the product and in the operating instructions should be adhered to.
FOLLOW INSTRUCTIONS: All operation and user instructions should be followed.
VENTILATION: With its 16 channels of very high dynamic range RF Diversity in a tiny ½ rack wide chassis, the Astral ARX8 circuitry generates a bit
of heat. This heat must be exhausted into the air to keep the unit cool enough for operation. Cool air is drawn through the side panel of the unit and
exhausted through the other side panel. It is imperative that the sides stay unobstructed with decent airflow.
HEAT: The product should be situated away from heat sources such as radiators, heat registers, stoves, or other product (e.g. amplifiers) that
produce heat.
FLAME SOURCE: The product should be situated away from any naked flames such as candles, open fires or gas, oil or wood burning heaters.
POWER SOURCES: The product should be connected to a power supply only of the type described in the operating instructions or as marked on
the product.
ATTACHMENTS / ACCESSORIES: Only use attachments and /or accessories specified and approved by the manufacturer.
CLEANING: The product should only be cleaned with a soft dry cloth.
DAMAGE REQUIRING SERVICE: The product should be serviced by qualified service personnel when:
● the power supply cord or the plug has been damaged: or
● objects have fallen, or liquid has been spilled into the product: or
● the product has been exposed to rain or moisture; or
● the product does not appear to operate normally or exhibits a marked change in performance; or
● the product has been dropped, or the enclosure damaged.
SERVICING: The user should not attempt to service the product beyond that described in the operating instructions. All other servicing should be
referred to qualified service personnel.
INSTALLATION: The product should only be installed and used in accordance with the manufacturers operating instructions. Use only with a cart,
stand, tripod, bracket or table specified by the manufacturer, or sold with the product. When a cart is used, use caution when moving the
cart/product combination to avoid injury from tip-over.
HEADPHONES: The headphone outputs can produce high sound level which may be harmful to your hearing. The use of lower impedance
headphones/earpiece may cause unacceptable high sound levels.
Astral ARX8 User Guide Introduction
8
1.7 Architectural Overview
The Astral ARX8 takes a brand-new approach to professional audio receiver design. The Astral ARX8 combines several technologies resulting in a
very powerful and versatile product. The diagram below illustrates the architecture of the Astral ARX8.
The first thing to note about the architecture is that there are two entire signal paths. This performs the True Diversity reception inherent in the
design. This is a lavish proposition, as it doubles the circuitry, but it is absolutely the best way to perform spatial diversity - superior to any type of
antenna or phase diversity.
The first section that comes right after the receive antennas is the first SAW filter array. This pre-select filter is a key element of our unique
SpectraBand technology. It allows for a tuning range from 169 MHz - 1525 MHz which is divided into multiple, tightly filtered tuning bands. The
extremely sharp attenuation at either end of a tuning band’s range significantly reduces unwanted interference outside the selected tuning band
resulting in excellent range performance. Tuning bands vary in width but tend to be around 24 MHz wide.
Next is the Low-Noise Amplifier (LNA), which is one of the most important stages in the design. This section has been specially designed for very
low noise and high dynamic range, which results in long-range reception and high overload capability. This LNA stage exhibits a noise figure of only
0.35 dB, one of the very best on the market currently.
This is followed by yet another SAW filter array. This array further attenuates out-of-band signals, ensuring reliable reception, and greatly
suppressing any image frequencies.
The Local Oscillator and Mixer perform the traditional function of a single down conversion superheterodyne radio. This section has been
meticulously designed and is the other key element of our unique SpectraBand technology. This section exhibits extremely low phase noise and
wide dynamic range to accurately down convert the RF to a lower Intermediate Frequency (IF) for conversion into the digital domain.
Before conversion into the digital domain, the signal passes through its final array of SAW filters, rejecting any extraneous energy not wanted in the
down conversion, as well as providing anti-aliasing before the Analog-to-Digital (A/D) converter. The A/D converter is a wideband, extremely high
dynamic range part which accurately captures 24 MHz of IF energy into a digital version of that signal.
The real magic of the entire Astral ARX8 happens within the Field-Programmable Gate Array (FPGA). An FPGA is essentially a giant custom,
massively parallel processor programmed in house. The FPGA can perform filtering, frequency conversion, and demodulation in the digital domain
which far exceeds anything that can be done via analog or traditional digital circuitry. The FPGA can perform demodulation of 16 channels
simultaneously. The FPGA also performs the True Diversity operation which not only selects the best digital word from the two antennas but works
at the bit level for additional range. The resultant audio signals are then fed out of the FPGA to the various audio outputs.
Astral ARX8 User Guide Panel Views
9
Chapter 2: Panel Views
2.1 Front Panel
1 & 3: Antenna Connector A & B
BNC connectors, for connecting to active, passive, or smart antennas.
2: Touchscreens
Color OLED array for control and monitoring.
● Touch can be disabled to prevent inadvertent switching of the screens to different views. Press and hold the Headphone Knob for > 2 secs
to disable. Re-enable by pressing and holding the Headphone Knob for > 2 secs. Disabled touch is indicated by a thin orange border
around the four OLEDs. The Headphone Knob and Triangle button remain active when touch is disabled.
● Screensaver: To prevent burn in, the OLEDs can be set to turn off after a period of inactivity from the Main Menu>System>Screensaver
setting.
● Lockout Mode: The whole front panel interface (OLEDs, Headphone Knob, and Triangle button) can be disabled to prevent unauthorized
users from accessing settings. See Main Menu>System>Lockout Mode.
4: Triangle Button
● Press to power up. Press and hold to power down.
● When powered up, press to cycle through the current Receiver view, Main Menu, and RTSA. Backs out of sub-menus.
5: Control Knob
● Rotate to scroll through lists and select parameter values.
● Rotate to scroll frequency cursor or adjust horizontal/vertical zoom in RTSA/Scan view.
6: Multicolor Ring LED
● Solid blue when powering up
● Flashing orange when selected Sync Reference is not detected.
● Solid green when the front panel is locked out. See menu (Main Menu>System>Lockout Mode).
1
2
3
4
5
6
Astral ARX8 User Guide Panel Views
10
2.2 Rear Panel
1 & 8: Antenna Connector A & B Inputs / Cascade Outs
● BNC connectors for connecting active, passive, or smart antennas.
● Cascade outs for looping through the front panel antenna A & B inputs. Only available when front panel antennas are selected in the
(Main Menu>RF) menu. The cascade out passively splits the incoming signal, resulting in approximately 3.5 dB of loss. In some situations,
additional antenna gain and/or amplification may be desirable to maintain excellent range.
2: D-Sub Audio Output Connector
25-pin D-Sub connector for outputting analog (mic/line/guitar level) or AES digital. See menu (Main Menu>Audio Output). Disabled when mounted to
an 8-Series via the expansion port. Note: the pin-out follows the AES59 standard. The analog output pin-out is different from the AES digital output
pin-out. See Connector Pin Assignments section for more information.
3 & 5: NexLink Antenna Connectors
Dual SMA-F ports for connecting 2.4 GHz SMA-M antennas for NexLink. Both antennas need to be connected.
Note: Only use the 2.4 GHz SMA-M antennas supplied with the Astral ARX8 or equivalent. Do not use 2.4 GHz RP-SMA antennas such as those
used for the 8-Series bluetooth antenna.
4: LTC / Word Clock Input
BNC for connecting LTC or Word Clock input. Astral ARX8 auto-detects whether the signal is LTC or Word Clock, including the associated frame
rate or sample rate. Disabled when mounted to an 8-Series via the expansion port.
6: DC Input
TA4-M, 10-18V DC input. Disabled when docked to an 8-Series via the expansion port.
7 & 11: DC Outputs
Dual, 4-pin Hirose female DC outputs (500 mA max between both outputs) for powering IFB transmitters, camera hops, and other low-power
peripherals. Disabled when docked to an 8-Series via the expansion port.
When powered via TA4, voltage is passed through from the DC input (10-18V).
9: USB-A Port
Multifunction USB-A port for:
● Pairing and syncing timecode to Astral transmitters. Connect the transmitter to Astral ARX8 using a USB-C to USB-A cable.
● Connecting a USB keyboard for naming channels, quick setup files, and network. The USB keyboard is active whenever the virtual
keyboard screen is displayed.
● Mounting a USB thumb drive for updating firmware and loading/saving settings.
Tip: The USB-A port supports USB hubs so that multiple devices can be connected at the same time. Maximum power output of 2.5 Watts (5V, 500
mA)
10: USB-C Port
For factory use only.
12: Card Slot
For factory-use only.
1
2
3
4
6
8
10
11
12
Astral ARX8 User Guide Typical Setup
11
2.3 Bottom Panel
1: Mounting Point
1 / 4”, 20 screw hole for mounting purposes.
2: Expansion Port
For docking Astral ARX8 to an 8-Series mixer/recorder using the Astral QuickDock optional accessory.
The expansion port provides power from the 8-Series and passes the multichannel receiver digital audio signals from Astral ARX8 to the 8-Series.
When docked on an 8-Series:
● The Astral ARX8 and its NexLinked transmitters are controlled from the Astral ARX8 OLED touch screen user interface. The 8-Series
interface is not used for control.
● Astral ARX8 rear panel connectors are disabled apart from the antenna connectors, control network, and the USB-A port.
● The USB-A port has the following capabilities:
○ Pairing Astral transmitters to the Astral ARX8 by connecting a USB-C cable from the transmitter to the USB-A port.
○ Attaching a USB keyboard for entering text directly (e.g. receiver channel names) into the Astral ARX8.
○ Mounting a USB thumb drive for updating Astral ARX8 firmware and saving setup files.
○ Syncing 8-Series timecode to an Astral transmitter from the Astral ARX8.
3: Screw holes for Astral QuickDock and Astral RX Shelf
Four screw holes for mounting the Astral ARX8 to an Astral RX Shelf and Astral QuickDock
Chapter 3: Typical Setup
1
2
3
3
3
3
Astral ARX8 User Guide Typical Setup
12
The versatile Astral ARX8 can be used in many types of setups and workflows. Here is an example with a 6-ch Astral ARX8 (one expansion license
installed) docked to an 8-Series mixer-recorder. The Astral QuickDock accessory enables the Astral ARX8 to be docked to an 8-Series mixer-
recorder. The bottom panel incorporates a multi-pin expansion port that connects power from the 8-Series and passes the multichannel receiver
digital audio from Astral ARX8 to the 8-Series.
Astral ARX8 User Guide Quick Start
13
Chapter 4: Quick Start
This Quick Start guide assumes that the Astral ARX8 is being used as a standalone receiver.
1. Connect a 10-18V DC power source to the TA4-M DC input.
2. Connect suitable passive, bias-powered, or smart antennas to either the front or rear BNC A and B antenna ports.
3. If using NexLink to control & monitor Astral transmitters, connect 2.4 GHz antennas to both rear panel 2.4 GHz SMA ports.
4. Connect required rear panel audio outputs (Analog, AES) from the Astral ARX8 to external devices.
5. Power Up. Press the front panel triangle button to power up. Press and hold to power down. When powered up for the very first time,
receiver channels 1-4 are displayed. This view is called the ALL View (or 4RX View when expansion licenses are installed). All RX
channels default to Off.
ALL View
6. Press the triangle button to display the Main Menu.
7. Tap the System icon to enter the System menu.
8. Ensure Country is set to the country that you are in. The Country setting determines which Tuning Bands and RF frequencies are legally
unrestricted and available for selection in the Astral ARX8. If using Astral transmitters, make sure that the Astral Remote app they are
paired to is also set to the same country.
Main Menu
9. Tap the RF icon in screen 2 to access the RF menu.
10. Select Front or Rear antennas by tapping the button at the bottom of screen 2. When ‘Rear’ is displayed, the rear antennas are selected.
When ‘Front’ is displayed, the front antennas are selected.
RF Menu
11. If the antennas require bias-power, tap the A and B antenna gear icons to display A and B antenna settings respectively and set both their
Power (Bias) settings to On.
Astral ARX8 User Guide Quick Start
14
Antenna Settings
The antenna icons will show a lightning bolt icon next to them when bias power is enabled.
12. Pair and NexLink Astral transmitters. Pairing is a process that adds Astral transmitters to the Astral ARX8 TX List. The TX List is an
inventory of available transmitters that can be selected for wireless remote-control (via NexLink) and assigned to receiver channels.
Note: A10-TX transmitters cannot be paired or NexLinked with the Astral ARX8. To tune to an A10-TX, manually set the RF freq, Modulation &
Privacy of the Astral ARX8 receive channel to the same as the A10-TX.
From the Main Menu, tap the TX List icon.
To pair an Astral transmitter, ensure it has a charged battery or batteries installed, then connect its USB-C port to the Astral ARX8 USB-A
port. The Astral transmitter will appear on the TX List after a few seconds. The Astral ARX8 will then automatically establish a NexLink
connection between the transmitter and the next available receiver channel. This can take up to a minute or so. Once connection is
established, the NexLink RSSI icon is displayed in the TX List > NexLink column.
TX List
13. From the TX List, rotate the Control knob to highlight a receiver channel, then press the knob to jump to its 1RX View from which the
receiver and its NexLinked transmitter can be configured and monitored.
1RX View
14. In the 1RX View, ensure the transmitter is within NexLink range by checking that the NexLink RSSI indicator on the leftmost screen shows
good signal strength.
Astral ARX8 User Guide Quick Start
15
15. If the Astral transmitter is not already on, tap the Power ON button on screen 3 of the 1RX View.
16. Press the triangle button to access the Main Menu, then tap the RTSA icon.
17. In the RTSA, rotate the Control knob (or tap the top half of the plot) to move the blue vertical frequency marker to a clean frequency (i.e.
where there is low background RF noise). Press the Control knob to display the ‘Assign Frequency To:’ list then tap RX1 to assign the
clean frequency to the required receiver channel (in this example, channel 2). The frequency is automatically pushed to the transmitter
and its RF signal appears in the trace. Alternatively, select ‘Auto Assign All’ at the top of the list to automatically deploy clean frequencies
to all active channels.
Tip: Before assigning frequencies, it is highly recommended to perform a scan of the local RF environment using Scan Mode to identify and choose
a clear Tuning Band. See RTSA > Scan Mode for further information.
18. Tap the orange number below the transmitter signal to jump to the 1RX View for that channel number, tap the Gain button and rotate the
Control knob to bring up the gain until you see audio signal from the lav connected to the Astral transmitter. Press the Control knob to
store the gain value.
Congratulations! You have your first wireless channel ready to go.
Astral ARX8 User Guide Powering
16
Chapter 5: Powering
The Astral ARX8 is powered from TA4 (10-18 VDC), from the 8-Series (via expansion port), or via XL-WPTA4
AC mains adapter (purchased separately).
The control knob ring LED illuminates blue during power up, then goes out once fully booted.
When the Astral ARX8 is first powered on, the last accessed RX View is displayed.
Tip: Turn off unused receiver channels to reduce power consumption. See 1RX View.
5.1 Powering when Astral ARX8 is standalone (not docked to an 8-Series)
Connect a 10-18 VDC power source (20 watt minimum) to the TA4 DC power input. The power source is displayed along with its voltage beneath
the Power menu icon in the Main Menu and in screen 1 of the Power menu.
● To turn Astral ARX8 on, press the triangle button or, with Power menu > ‘Turn on when power is applied’ enabled, simply connect a power
source.
● To turn Astral ARX8 off, press and hold the triangle button until the ‘Powering down ...” progress bar completes.
5.2 Powering when Astral ARX8 is docked to an 8-Series
Connect power to the 8-Series. Power is supplied to the Astral ARX8 from the 8-Series expansion port.
Note: When docked, powering via the Astral ARX8 TA4 DC input is disabled.
Ensure that the 8-Series System Menu > Expansion Port is set to On.
● If Power menu > ‘Turn on when power is applied’ is enabled, Astral ARX8 automatically powers on when the 8-Series is turned on.
● If Power menu > ‘Turn on when power is applied’ is disabled, turn on the 8-Series then press the triangle button to turn on Astral ARX8.
● To turn Astral ARX8 off but keep the 8-Series on, press and hold the triangle button until the ‘Powering down …’ progress bar completes.
● To turn off both the 8-Series and Astral ARX8, move the 8-Series power toggle switch to Off.
5.3 Power – DC Outputs
The DC Outs can be used for powering IFB transmitters, camera hops, and other low power peripherals.
Enable or disable each DC Output from the Power menu.
● When powered via its TA4 DC input, the Astral ARX8 supplies 500 mA maximum between both DC outputs. DC Output voltage is passed
through from the DC input (10-18V).
● When powered by the 8-Series, Astral ARX8 supplies 3W maximum for each DC Output. Exceeding this limit may cause malfunction.
Voltage is dependent on 8-Series power source voltage.
Astral ARX8 User Guide Navigating the User Interface
17
Chapter 6: Navigating the User Interface
The Astral ARX8 is operated from its front panel triangle button, control knob, and four touch screens.
Triangle Button
● Press to power up. Press and hold to power down.
● When Astral ARX8 is powered up, press to cycle between the RX View, Main menu, and RTSA. When in a menu or submenu, the triangle
button exits to the menu above.
Control Knob
● Rotate to scroll through lists and select parameter values. Press to store.
● Rotate to scroll frequency cursor or adjust horizontal/vertical zoom in the RTSA/Scan view.
Touch Screen UI Elements
The Astral ARX8 uses different UI elements for changing settings i.e. toggle switch, list button, value button, action button, etc.
Note: When any touch screen UI element is selected, brightness is reduced, and touch is disabled on all other touch screens.
● Toggle Switch: Tap to toggle between On and Off. Typically used for functions that have on and off states e.g. Power > DC Out 1 and DC
Out 2.
Off On
● List Button: Displays a list of items to choose from. A list button is identified by a down arrow inside the button on the right. The currently
selected item is displayed inside the button.
○ Tap the list button to display a list of items to choose from.
○ Scroll the list of items by rotating the Control or tapping the up/down arrows, then press the Control knob to select the item and
exit the list. Alternatively, tap directly on the list option to select it.
○ To exit the list without making any changes, press the triangle button or tap anywhere in the list’s title bar.
● Value Button: Displays a parameter’s value.
○ Tap to select - the button turns orange.
○ Rotate the Control knob to adjust the value.
○ Press the Control knob or tap the button to exit.
● Action Button: A button that initiates a process e.g. Format USB Drive. The button contains the name of the process.
Astral ARX8 User Guide Navigating the User Interface
18
● Two-State Button: A button that has two values or options other than On/Off. The top row labels the function, and the bottom row shows
the current setting.
Astral ARX8 User Guide RX Views
19
Chapter 7: RX Views
RX Views display real-time receiver channel, transmitter signals, and status information across the four touchscreens.
There are several types of RX Views:
● ALL (Displays either 4, 6 or 8 channels, depending on how many channel expansion licenses are installed)
● 4RX View (available when at least one channel expansion license is installed)
● 1RX View
Upon power up, the Astral ARX8 shows the last displayed RX View.
7.1 All View
(‘All’ View when two 2-ch expansion licenses are installed)
● Displays 8 receiver channel strips, two per screen.
● Tap the right arrow at the bottom of screen four to bank to the next four or eight channels (w/expansion license only).
● Tap two neighboring screens simultaneously to display the 4RX View for those receiver channels. For example, tap screen 2 and 3
simultaneously to display the 4RX View for receiver channels 3-6.
● Tap any receiver channel strip to display its 1RX View.
1. Channel Name: Displays the name of the transmitters that is currently feeding the channel.
a. The transmitter name can be edited if the channel is NexLinked to an Astral transmitter.
b. The transmitter name cannot be edited if an A10-TX is assigned to it.
2. Transmitter Battery Level Icon: Indicates the remaining transmitter battery charge as a color and in % or V depending on the type of
battery the transmitter is using. If AA or AAA, the battery level is displayed as a voltage. If NP-BX1, then it is displayed as a %.
a. Gray = Transmitter is Off
b. Green = Good
c. Orange = OK
d. Red = Low
e. Flashing Red = Depleted (transmitter RF and audio are disabled)
3. NexLink RSSI Meter: Indicates the RSSI of the received 2.4 GHz NexLink signal from the transmitter. The RSSI color signifies the
transmitter NexLink status.
a. Green = Transmitter is on and NexLink active
b. White = Transmitter is off and NexLink active
c. Gray = No connection or out of range
1
2
3
4
5
6
7
8
9
Astral ARX8 User Guide RX Views
20
4. Record/Mute Status: Indicates whether the transmitter feeding the receiver channel is recording and/or muted.
a. Red = Recording
b. Blue = Muted
c. Blue fill, red border = Recording and muted
d. Gray = Not recording or muted
5. RF Frequency: Displays the receiver channel’s frequency.
a. If an Astral transmitter has an active NexLink connection and NexLink>NexLink Tuning Mode is set to ‘Automatic’, the
transmitter will follow the assigned receiver channel frequency.
a. Displays ‘RX Off’ when the receiver channel is Off.
b. The frequency flashes red when there is a NexLink issue. Go to the 1RX View > Gear Menu > NexLink Status screen to
determine the cause of the issue.
6. RF History: Displays the receiver channel’s RSSI or Q history. See RF Menu.
7. A and B RSSI Meters: Indicates the received antenna signal strength from the A and B antennas at the RX channel’s current frequency.
The RSSI meter scale is -100 to -65 dBm.
8. Link Q Meter: Indicates the quality of the received wireless audio transmission from the transmitter.
9. Audio Meter: Indicates the received audio level from the transmitter. The audio meter scale is -100 to 0 dBFS for GainForward sources
and -50 to 0 dBFS for non-GainForward sources.
7.2 4RX View
(or ALL View when no expansion licenses are installed)
● Displays 4 receiver channels, one per screen.
● If at least one channel expansion license is installed, tap the right arrow at the bottom of screen four to go to the next bank of channels. In
the next bank, tap the left arrow at the bottom of screen one to bank to the previous four channels 1-4.
● Tap any receiver channel screen to display its 1RX View.
● Tap the RTSA icon at the bottom of screen 4 to display the RTSA on screen 4.
1. Channel Name and Audio Meter: Displays the transmitter (channel) name inside an audio level meter. Tap the meter to edit the name
(12-character maximum) using the virtual keyboard.
a. The transmitter name can be edited if the channel is NexLinked to an Astral transmitter
b. The transmitter name cannot be edited if the channel is being fed from an A10-TX.
1
2
3
4
Astral ARX8 User Guide RX Views
21
c. If NexLinked to an Astral transmitter, the name is pushed to the transmitter.
d. The name is rippled to the 8-Series channel that the receiver channel is routed to if docked to an 8-Series and the 8-Series
menu [Channel Setup > Use Wireless Names] is enabled.
2. RF Frequency: Displays the receiver channel’s frequency. Tap to edit the frequency.
a. If NexLinked to an Astral transmitter and NexLink Tuning Mode is set to Automatic, it is the same as the transmitter frequency.
b. Displays ‘RX Off’ when the receiver channel is Off.
c. The frequency flashes red when there is a NexLink issue. Go to the 1RX View > Gear Menu > NexLink Status screen to
determine the cause of the issue.
d. Tap the frequency button to select a frequency within the current Tuning Band.
e. To enter a frequency, tap each frequency field then rotate the Control knob to select a value. Tap OK to store or Cancel to exit
without saving. Alternatively, jump through the frequency fields by pressing the Control knob.
f. To save power, turn off a receiver channel by setting the RX On/Off toggle to Off.
If NexLinked to an Astral transmitter, the frequency is automatically pushed to the transmitter unless System > More > NexLink Tuning
Mode is set to Manual.
3. HPF: Indicates if the HPF is active either on the transmitter (if an A10-TX) or receiver channel (if an Astral transmitter).
4. Record/Mute: Indicates if the transmitter is recording and/or muted. Red for record, blue for mute, and blue with red border for both record
and mute.
Astral ARX8 User Guide RX Views
22
7.3 1RX View
Displays a receiver channel’s received signal, audio level, control functions and status across the four OLEDs.
Use the 1RX View to perform detailed control and monitoring of a receiver channel and its associated transmitter. The 1RX View has different
control layouts depending on the following criteria:
● The model of the transmitter feeding the channel (Astral HH, Astral TX, Astral Mini, or A10-TX)
● Whether the channel is sourced from one or multiple transmitters.
● Whether the channel is sourced from a NexLinked or non-NexLinked (e.g. A10-TX) transmitter.
● Whether the channel’s Mode is set to RF Only, REC Only, or RF+REC
● Whether the Astral ARX8 is standalone or docked to an 8-Series mixer/recorder
Some 1RX View Layout examples
Astral
ARX8
Mode
Description
1RX View Layout
Standalone
REC+RF
Channel sourced from a
single Astral transmitter
(See Example 1 below
for a detailed description)
Standalone
RF Only
Channel sourced from a
single Astral transmitter
Standalone
REC+RF
Channel sourced from
multiple Astral
transmitters
(See Example 2 below
for a detailed description)
Docked
RF Only
Channel sourced from a
single Astral transmitter
(expansion license
installed)
Standalone
--
Channel sourced from an
A10-TX or non-
NexLinked transmitter.
To tune to an A10-TX,
manually set the RF freq,
Modulation & Privacy of
the Astral ARX8 receive
channel to the same as
the A10-TX.
Astral ARX8 User Guide RX Views
23
Example 1: 1RX View when sourced from a single Astral TX transmitter in REC+RF Mode,
Standalone
● Navigate to the next or previous channel’s 1RX View by tapping the right and left arrows at the bottom of screen 4.
● Navigate to other RX Views by tapping the RX View icons at the bottom of screen 3.
● Tap the RTSA icon at the bottom of screen 4 to display the RTSA for the selected channel frequency in screen 4. The RTSA is approx. 1
MHz wide and centered on the selected frequency. Tap the RTSA to jump to the full RTSA for the currently selected Tuning Band.
1. Channel Name and Audio Meter: Displays the transmitter (channel) name inside an audio level meter. Tap the meter to edit the name
(12-character maximum) using the virtual keyboard. The audio meter scale is -90 to 0 dBFS for GainForward sources and -50 to 0 dBFS
for non-GainForward sources, i.e. A10-TX.
a. The transmitter name can be edited if the channel is NexLinked to an Astral transmitter
b. The transmitter name cannot be edited if the channel is being fed from an A10-TX.
c. If NexLinked to an Astral transmitter, the name edits are pushed to the transmitter.
d. The name is rippled to the 8-Series channel that the receiver channel is routed to if docked to an 8-Series and the 8-Series
menu [Channel Setup > Use Wireless Names] is enabled.
2. Transmitter Battery Level Icon: Indicates the remaining transmitter battery charge as a color and in % or V depending on the type of
battery the transmitter is using. If an AA, AAA, or 18650, the battery level is displayed as a voltage. If an NP-BX1, then it is displayed as
a %.
a. Gray = Transmitter is Off
b. Green = Good
c. Orange = OK
d. Red = Low
e. Flashing Red = Depleted (transmitter RF and audio is disabled)
3. NexLink RSSI Meter: Indicates the RSSI of the received 2.4 GHz NexLink signal from the transmitter. The RSSI color signifies the
transmitter NexLink status.
a. Green = Transmitter is on and NexLink active
b. White = Transmitter is off and NexLink active
c. Gray = No connection or out of range
For receiver channels that are sourced from a single transmitter, tap the NexLink RSSI meter to display the NexLinked Transmitter List
from which you can select an Astral transmitter to NexLink to.
4. RF Frequency: Displays the receiver channel’s frequency.
a. The frequency flashes red when there is a NexLink issue. Go to the 1RX View > Gear Menu > NexLink Status screen to
determine the cause of the issue.
b. Tap the frequency button to select a frequency within the current Tuning Band.
1
2
3
4
5
6
7
8
9
10
11
12
14
13
15
16
17
18
20
19
21
Astral ARX8 User Guide RX Views
24
c. To enter a frequency, tap each frequency field then rotate the Control knob to select a value. Tap OK to store or Cancel to exit
without saving. Alternatively, jump through the frequency fields by pressing the Control knob.
d. To save power, turn off a receiver channel by setting the RX On/Off toggle to Off.
If NexLinked to an Astral transmitter, the frequency is automatically pushed to the transmitter unless System > More > NexLink Tuning
Mode is set to Manual.
5. RF History: Displays the receiver channel’s RSSI, Q, or RSSI+Q history. See Menu > RF.
6. A and B RSSI Meters: Indicates the strength of the received diversity signal from the transmitter.
7. Link Q Meter: Indicates the quality of the received diversity signal from the transmitter.
8. Gain: Adjusts receiver channel gain, -6 to 60 dB. Unavailable when docked to an 8-Series; use 8-Series channel trim gains instead.
9. HPF: Adjusts receiver channel HPF (Off, 40, 60, 80, 100, 120, 160, 200 Hz). Unavailable when docked to an 8-Series; use 8-Series
channel HPF instead.
10. More: Tap to access a second page of settings including:
a. Audio Outs: Tap to access the Audio Output Routing popup on OLEDs 1-4 from which the RX channel’s Main and Aux (1-3)
audio output paths can be configured.
The Astral ARX8 has 16 audio outputs which can be fed from up to 8 receiver channel main/aux paths. Each of these 16 audio
outputs can be selected as feeds for the analog and AES output interfaces. Multiple receiver channels can be summed to any of
these 16 audio outputs by assigning them to the same main or aux (1-3) path in the Audio Output Routing popup. When doing
so, the following is displayed: “Output already has one or more RX channels routed to it. Continue? OK, Cancel”. Select OK to
sum the RX channels to the same output or cancel, to cancel the routing.
Note: When multiple RX channels are summed to the same output, it is possible to clip the output (exceed 0 dBFS). Adjust RX
Channel gain controls or the Audio Menu’s Global RX Output Gain accordingly.
Note: An RX Channel’s Main and Aux (1-3) paths cannot be set to the same Output. “Main and Aux cannot have the same output.
Select another output. OK” is displayed if this routing is attempted.
The Main Audio Output path is typically used as the ‘normal’ program feed path. The Aux (1-3) Audio Output paths are typically
used for talkback purposes but there is a myriad of other possible use cases. Aux (1-3) are activated from Astral transmitter
control switches or buttons or using the RX channels’ Aux (1-3) On/Off toggles. Enable the ‘Aux (1-3) Mutes Main’ toggle switch
to mute the Main feed when Aux (1-3) are active.
Main: Selects the Main program feed output path. Select from Out 1 to Out 16. Factory default is RX Channel ‘n’ to Main Out ‘n’.
Aux (1-3): Selects the Aux (1-3) program feed output path. Select from Out 1 to Out 16. Factory default is RX Channel ‘n’ to Aux
Out ‘None’.
b. Polarity: Adjusts the polarity of the channel audio between Normal and Reverse. Unavailable when docked to an 8-Series; use
8-Series channel polarity instead.
c. Audio Offset: This setting is only available in a transmitter’s TX View and when the transmitter is assigned to an RX channel
with more than one transmitter assigned. The audio offset is a value stored in the Astral transmitter that tells the receiver
Astral ARX8 User Guide RX Views
25
channel it is feeding to apply a gain offset to the incoming transmitter audio signal. When a receiver channel has multiple
transmitters assigned, this can be used to compensate for the different transmitter audio output levels resulting from
microphones / lavs with different sensitivities.
d. Mode: Sets a NexLinked Astral transmitter’s Mode. Options are RF only, REC only, and REC+RF (non-US TX models only or
Astral TX models not set to Lav). The Astral HH does not support REC+RF mode.
e. <<Back: Tap to access the first page of settings.
11. Privacy: Tap to set a Privacy Key. This prevents unauthorized Astral receiver users deciphering the transmitter audio signal. Tap New
Key to generate a random 4-digit key or Clear Key, to reset to zeros. The key is pushed to NexLinked transmitters assigned to the receiver
channel.
12. Modulation: Sets Modulation between Standard, Long Range, and T&M (Test & Measurement). Compared to Standard Modulation, Long
Range Modulation has better sensitivity. This increased sensitivity results in better range in challenging RF environments. The Modulation
setting must match between the transmitter and the Astral ARX8 for the transmitted signal to be received.
If NexLinked to an Astral transmitter, the modulation setting is automatically pushed to the transmitter unless System > More > NexLink
Tuning Mode is set to Manual.
13. RF Power: Sets a NexLinked Astral transmitter’s RF power. Options are 2 mW, 10 mW, 20 mW, 40 mW, and 100mW (Astral HH only). RF
Power Level options are dependent on TX model, Country, Tuning Band, Frequency Authorization, and whether the ‘Allow Extra High RF
Power’ option is enabled in the Gear menu. The RF Power text changes to a red font if the actual transmitter power is different from that
selected RF Power, for example, if a restricted frequency authorization expires.
14. Power On/Off Buttons: Tap to power on and off the transmitter and receiver channel.
15. RF On/Off Buttons: Tap to enable or disable transmitter RF transmission.
16. Record Start/Stop Buttons and Status: Tap to start and stop the transmitter recording. Record button is red when recording. The record
stop/start buttons are not displayed when the Astral transmitters are in RF Only mode.
17. ID On/Off Buttons: Tap to identify the Astral transmitter. Its LEDs will start flashing and if it's an Astral TX, it will also vibrate.
18. Mute On/Off buttons: Tap to mute and unmute the transmitter.
19. Transmitter Timecode Status (only available in Rec Only or Rec+RF mode): Tap the TC Icon to display whether the Astral transmitter
has synced successfully to the Astral ARX8. Displays ‘TC synced’ when successfully synced. Tap again to return to the TC Icon.
Note: Astral transmitters hold their synced timecode accurately for 4 hours after power down, then reset. Without a battery inserted, they hold for 1
hr after power down.
20. Gear Menu: Provides access to two pages of other transmitter settings plus NexLink Status alerts. Available options depend on Astral
transmitter model, Astral Mini, Astral TX or Astral HH.
Gear Menu Page1/2
a. NexLink Status: Displays status alerts relating to communication over NexLink. See NexLink Status Alerts
b. Transmitter LEDs: Enables or disables the transmitter’s LEDs.
c. Auto-Power with Lemo Connection: Set to ON to have the Astral transmitter automatically power on when a Lemo is
connected.
d. Resume Record upon Powering On: Set to ON to have the Astral transmitter automatically resume recording on power up if it
was recording prior to powering down.
Astral ARX8 User Guide RX Views
26
e. Allow Extra High RF Power: Allows the selection of 40 mW (and 100 mW if an Astral HH) for RF Power. RF Level availability
is dependent on TX model, Country, Tuning Band, and Frequency Authorization.
f. Format TX: Sends a command to the Astral transmitter to format its recording media. Select OK or Cancel at the ‘Are you sure
you want to format?’ prompt. ‘Formatting in Progress’ is displayed during formatting. ‘Format Successful’ is displayed when the
process has completed successfully.
g. Restore TX Settings: Sends a command to the Astral transmitter to restore its setting to factory defaults.
h. More … Selects Page 2/2. Available settings depend on selected Astral transmitter model.
Example: Page 2/2 for the Astral TX
i. Power Mini when Removed from PowerStation: Astral Mini Only. Set to ON to have an Astral Mini transmitter automatically
power on when removed from a PowerStation-8M. Not available for the Astral TX transmitter.
j. Mini Battery Doubler Installed: Astral Mini Only. When set to YES, the battery remaining % indicator adapts to the Astral-
BatteryDoubler’s discharge characteristics to provide accurate readings.
k. Transmitter Information: Displays the NexLinked transmitter’s model, firmware version and serial number.
l. XLR Input Type: Astral TX Only. Select Mic, Line, P12, P48, AES3-1, AES3-2, AES42-1, or AES42-2. If Lav or Guitar are
connected to the Astral TX, they are automatically selected. When a Guitar is detected, the Guitar Cable Capacitance and Input
Impedance options below are un-grayed.
m. Lav Mic Type: Astral TX Only. Select Normal or 3-Wire. Note that the Astral TX’s auto-input type sensing is disabled when set
to 3-Wire.
n. Battery Chemistry: Astral TX Only. Selects chemistry type for 1.5V type batteries: NiMH, Alkaline, or Lithium Primary.
o. Control Ring Type: Astral HH Only. Selects what type of Control Ring is installed on the Astral HH. Select from Control-0,
Control-1, Control-3, and Control-Sw.
p. Control Ring LEDs: Astral HH Only. Selects what the selected Control Ring’s LEDs should show.
q. Slide Switch: Astral HH with Control-Sw installed only. Selects the function of the slide switch. Select from None, Mute, Rec,
Aux Latch, Power, GPIO, and RF.
r. Button: Astral HH with Control-1 installed only. Selects the function of the button. Select from None, Mute, Rec, Aux Hold, Aux
Latch, Power, Control, RF and PTT.
s. Button-L, -C, -R: Astral HH with Control-3 installed only. Selects the function of the L, C, and R buttons. Select from None,
Mute, Rec, Aux Hold, Aux Latch, Power, Control, RF and PTT.
t. Display LEDs: Astral HH Only. Selects what the selected ePaper Display’s backlight should show.
u. LED Mode: Astral TX Only. Select from All, Front Only, or Top Only
v. Astral TX Switch: Astral TX Only. Selects the function of the optional toggle switch. Select from None, Power, Mute, Record,
Aux, RF, Control.
w. Display Background: Astral TX Only. Selects Light or Dark background color
x. Display Orientation: Astral TX Only. Select between Normal or Flipped.
y. Display Name: Astral TX and Astral HH Only. Select between Top and Center.
21. RX View Navigation Icons: Tap to navigate to another RX View.
Astral ARX8 User Guide
27
Example 2: 1RX View when sourced from multiple Astral transmitters in REC+RF Mode,
Standalone
Many of the controls are the same as those described in Example 1. However, this 1RX View displays only those functions which are common to the
receiver channel and all assigned transmitters. To change settings pertaining to only one of the assigned transmitters, tap 'Configure
Transmitters…’, highlight the transmitter, then tap TX View. The TX View can also be accessed from the TX List.
When a receiver channel is sourced from multiple transmitters, the Assigned Transmitters list in OLED 3 displays a list of all assigned transmitters.
The transmitter name shown in OLED 1 and the one shown in green font in the Assigned Transmitters list, is the transmitter that is currently being
received by the channel over the forward link.
Frequency, Modulation, and Privacy settings are applied to all assigned transmitters when NexLink Tuning Mode is set to Automatic.
Note: Make sure to have only one assigned transmitter powered up at a time otherwise they will interfere with each other. Power On/Off buttons are
conveniently included in the view accessed by tapping ‘Configure Transmitters…’, to make it easy to ensure only one transmitter is powered on at a
time: select a transmitter in the list then tap the power ON or OFF buttons as necessary.
Astral ARX8 User Guide Menus
28
Chapter 8: Menus
All the Astral ARX8 settings are organized into menus which are accessed via the top-level Main Menu. The triangle button cycles between the
current RX view, Main Menu, and RTSA. Press the triangle button one or two times to display the Main Menu. The leftmost touch screen displays
icons for the various RX views. Tap an RX View icon to jump to its RX View. When in a menu, back out to the menu above by pressing the triangle
button or tapping the leftmost screen (except when in the RTSA menu).
Main Menu
Menu
Description
1RX
Displays a receiver channel’s received signal, audio level, control functions and status across the four screens.
4RX
Only available if expansion licenses are installed. Displays 4 receiver channels, one per screen.
ALL
Displays 4, 6, or 8 channels depending on how many 2-ch expansion licenses are installed.
TX List
Displays an inventory of paired TXs and which RX channels they are NexLink’d to. Pair/Unpair, Handoff &
control an individual TX or group of TXs. ‘TX List’ flashes yellow when any paired transmitter assigned to an RX
channel is not connected via NexLink.
TX Group
Accesses the TX Group Control menu where commands can be sent to all or custom groups of TX.
RF
Accesses antenna, tuning band, RF History settings, and Antenna Length menu
RTSA
Displays the RTSA, a real time spectrum analysis tool for assisting in frequency coordination.
AutoAssign
Scans the current tuning band for clean frequencies and assigns them to active channels and their paired TX.
Audio Out
Accesses D-Sub output, sync reference, sample rate settings, and tone generator settings.
Power
Displays the DC input voltage. Enables/disables DC Out 1 and 2 and configures whether the Astral ARX8
should power on automatically when power is applied.
Timecode
Displays incoming LTC BNC timecode and frame rate
NexLink
NexLink-related settings
System
Various system settings. See System Menu for details.
Quick Setup
Load and Save Setup files for quick recall. Setups can be saved to 4 internal memory slots or to an external
USB drive connected to the USB-A port.
1RX
Displays a receiver channel’s received signal, audio level, control functions and status across the four screens.
Astral ARX8 User Guide TX List
29
Chapter 9: TX List
The TX List is an inventory of all paired Astral transmitters and which RX channels, if any, they are assigned to. Up to 64 transmitters can be paired
with the Astral ARX8. ‘Pairing’ is a process that establishes a NexLink relationship between the Astral ARX8 and Astral transmitter. Once paired, an
Astral transmitter can be controlled and monitored from Astral ARX8. Transmitters can also be assigned to user-nameable groups. Up to 8 user
groups are available. When one or more transmitters are assigned to a group, that group is displayed at the top of the TX list. An ‘All TX Group’ is
optionally available and will appear at the top of the TX List if the System > Show All TX Group toggle is set to On.
One or more Astral transmitters can be assigned to a single receiver channel. When the Astral ARX8 is set to ‘Manually set frequency …’ in the
NexLink menu, all transmitters assigned to a receiver channel are sent that channel’s RX Frequency, Modulation, and Privacy settings. This makes it
easy to quickly switch between transmitters assigned to the same receiver channel, particularly useful in live scenarios such as switching to a
backup transmitter or switching between a performer’s different mics or instruments that are being fed to the same channel on an external mixer.
Note: When multiple transmitters are assigned to the same receiver channel and frequency, to prevent interference, ensure that only one of those transmitters
is actively transmitting.
9.1 Pairing an Astral Transmitter to the Astral ARX8
To establish NexLink wireless control between an Astral transmitter and the Astral ARX8, a new transmitter must be added to the TX List in a
process called ‘pairing’. Pairing is saved indefinitely over power cycles, and typically only must be done during initial system setup. Once paired, a
transmitter can be assigned to a receiver channel (‘Chan’) and group. Paired transmitters that are not assigned to a receiver channel can still be
controlled via NexLink from the TX List. A transmitter can only be paired with one Astral Receiver at a time; however, it is possible to wirelessly
‘handoff’ control to another Astral Receiver easily - see Unpairing/Handoff.
Pairing automatically assigns the transmitter to the next available receiver channel number, but it is easy to subsequently reassign to any receiver
channel. Should a transmitter not be required for a particular production or event, simply remove the receiver channel assignment by setting the
transmitter channel number to ‘-’. Once transmitters are paired, they remain persistently in the TX List until unpaired.
Transmitters can be paired wirelessly or via USB.
9.2 Pairing via USB
1. Enter the TX List by tapping the TX List icon in the Main Menu.
2. Connect the Astral transmitter’s USB-C port directly to the Astral ARX8’s rear USB-A port directly or via a USB hub. It is not necessary for
the Astral transmitter to be powered on or for it to have a battery installed during USB pairing.
3. Wait for several seconds while the Astral transmitter pairs to the Astral ARX8. The Astral transmitter will appear in the list once discovered,
then go through the pairing process - ‘Connecting’ then ‘Initializing’.
4. Disconnect the USB cable between the Astral transmitter and the Astral ARX8.
Tip: Use a USB Hub (or PowerStation-8M) to pair multiple Astral transmitters simultaneously.
Astral ARX8 User Guide TX List
30
9.3 Wireless Pairing
Note: A transmitter cannot be wirelessly paired with Astral ARX8 if the Astral Remote app is open and in communication with it.
1. Put the Astral transmitter into pairing mode as follows:
a. Astral Mini: Power off the Astral Mini, then press and hold the red button inside the battery compartment until the Mini’s blue
light flashes continuously.
b. Astral TX and Astral HH: Access the transmitters menu and select Pair. Its blue light will flash continuously and ‘Pairing. Please
wait … ‘ is displayed.
c. All TX: Use the TX List’s Handoff button from the Astral ARX8 that currently has NexLink control.
2. Go to the Astral ARX8’s TX List and tap the search icon in OLED 1 to display the ‘Searching for TX’ View.
Note: Astral ARX8 uses its local 2.4 GHz antennas to search for transmitters in pairing mode. Once found, transmitters are displayed in the list.
3. Tap a transmitter’s Select box to select/deselect it for pairing to the Astral ARX8. A ‘X’ in a blue Select box indicates that it is selected. Tap
Select All to select all transmitters.
4. Tap ‘Pair Selected’. When pairing multiple transmitters, the system assesses each TX, starting with the transmitter with the lowest
frequency and assigns it to the lowest available RX channel.
5. At the popup, select whether to apply the transmitter’s current frequency to the RX Channel.
a. Select No to have the Astral ARX8 send the assigned RX channel’s frequency to the transmitter.
b. Select Yes to have the Astral ARX8 get the frequency from the transmitter and assign it to the RX Channel. When assigning to
RX channels, the system assesses each TX in turn and assigns it to the lowest available RX channel that is in a band that
corresponds to the transmitter’s frequency. If it can’t find a corresponding band, it will not assign the transmitter i.e. ‘RX Chan’ is
set to ‘--’.
6. During pairing, the green ‘Searching for TX’ text in OLED 1 changes to ‘Pairing TX’. Pairing progress is indicated in the NexLink column in
OLED 3 and changes from ‘Waiting’ to ‘Connecting’ to ‘Initializing’. The NexLink RSSI icon is displayed once NexLink communication is
fully established. Allow the process to fully complete before exiting out of the screen. Leaving the screen before all selected transmitters
are paired, displays ‘Transmitter(s) are still being paired or being assigned to channels. OK’.
7. Tap Abort Pairing to abort pairing of transmitters that are not yet paired.
8. Tap Exit once all transmitters have paired. Exiting the screen before all selected transmitters are paired, displays ‘Abort pairing
transmitters that are not yet paired? OK, Cancel’
Astral ARX8 User Guide TX List
31
9.4 Unpairing / Handoff
Unpairing or handing off a transmitter breaks its NexLink relationship with the Astral ARX8 and removes it from the TX List. You may want to do this
if you want to clear out unused transmitters from the TX List or hand off NexLink control to another Astral ARX8, Astral-RX16, or Astral-RX32. Once
a transmitter is unpaired or handed off, the Astral ARX8 can no longer control it via NexLink. Unpairing and Handoff are very similar actions:
● Select Unpair to simply unpair a TX from the Astral ARX8 and remove it from the TX List. Groups of transmitters cannot be unpaired.
● Select Handoff to unpair and put the TX into pairing mode, ready to be paired with another Astral Receiver. Groups of transmitters can be
handed off.
To Unpair, rotate the Control knob to select a transmitter in the list and tap the Unpair button in OLED 4. An ‘Are you sure …” popup appears. Tap
OK to unpair and remove the transmitter from the TX List.
To Handoff, rotate the Control knob to select a transmitter or transmitter group in the list and tap the Handoff button in OLED 4. This unpairs the
selected transmitters and puts them into Pairing mode. They are now discoverable by other Astral Receivers. Follow the instructions in Wireless
Pairing to establish pairing with another Astral-Receiver.
9.5 TX List Description
The TX List displays the following columns:
● Name: The name of the paired transmitter. Tap to edit the name.
● RX Chan: The receiver channel number to which the transmitter is assigned. Tap to assign. Unassign by setting to ‘-’.
● Batt: Displays the transmitter’s power status and battery level. A battery icon with gray fill is powered off.
● NexLink: Displays NexLink status.
○ ---: After powering up, Astral ARX8 is waiting to hear from the Astral transmitter. Transmitter is out of range or its battery is
depleted if it remains in this state.
To conserve power, powered-off transmitters enter sleep mode after 4 hours of NexLink inactivity. This occurs when both the Astral
ARX8 and the transmitter have been powered off for more than 4 hours. While in sleep mode, the transmitter's NexLink communication
is disabled. To wake up a sleeping transmitter, it must be near the Astral ARX8. Once awakened, long-range NexLink communication is
automatically restored.
○ Connecting: Establishing NexLink communication.
○ Initializing: Initializing connection.
○ NexLink RSSI icon: NexLink communication established. Displays the quality of the NexLink signal.
■ When TX is on, the RSSI level display is green
■ When TX is off, but NexLink is active, the RSSI level display is white
■ When TX has no NexLink communication, the RSSI level display is gray.
● Freq: Displays the transmitter’s frequency.
● Group: Assign the selected transmitter to a transmitter group. Grouping allows multiple transmitters to simultaneously respond to a group
command such as Power On/Off. There are 8 groups, 1-8. Set to ‘-’ to unassign a transmitter from a group. If no transmitters are assigned
to a group, then that group is inactive and does not appear in the TX List. Active groups are displayed as rows at the top of the TX List in
ascending numerical order. Tap a group’s name to edit it. The group number is shown in parentheses after the group name. A group
name can be up to 12 characters long.
The TX List is sorted according to ascending receiver channel (RX Chan) number. When multiple transmitters are assigned to the same receiver
channel, they are sorted in alphabetical order within that channel number’s group.
9.6 Assigning a Paired Transmitter to a Receiver Channel
Assigning a paired transmitter to a receiver channel enables synchronization of frequency, modulation, and privacy settings between the transmitter
and that receiver channel. Up to 16 transmitters can be assigned to the same receiver channel.
1. Rotate the Control knob to select a transmitter, then tap the ‘RX Chan’ box.
2. Rotate the Control knob to choose a channel number, then press the Control knob to store.
a. If the selected receiver channel has no transmitters already assigned, the selected transmitter is immediately assigned to that
channel.
b. If the selected receiver channel already has one or more transmitters assigned to it, a popup is displayed in OLED 2 prompting
whether the selected transmitter should be added to that receiver channel or replace the transmitter that is currently assigned to
it. If Replace is selected, the replaced transmitter is unassigned from the RX Channel.
Astral ARX8 User Guide
32
c. If you are only working with a single transmitter per receiver channel, you can select that single transmitter directly from that
channel’s 1RX View. In the 1RX View, tap the NexLink Icon to display the ‘NexLinked Transmitter’ List from which you can
select an Astral transmitter.
Tip: Rotate the Control knob to scroll through the TX List. Select a transmitter by highlighting its row, then press the Control knob to jump directly to
its receiver channel’s 1RX View.
Tip: The TX List icon in the Main Menu is yellow if not all transmitters are connected and green when all transmitters are successfully connected or
when no transmitters have been paired. If using the Astral Remote app for control, it is best practice to fully close the Astral Remote app or disable
transmitter control in the app’s Manage Transmitters view until transmitters are shown as connected in the TX List.
9.7 TX View
Tap the TX View button to access the selected transmitter’s settings. The button is grayed out when the transmitter is not connected via NexLink. TX
settings can also be accessed via the 1RX View of the receiver channel that the transmitter is assigned to.
For a detailed description of many of the TX View’s controls which it shares with the 1RX View and its Gear menu, see 1RX View.
Astral ARX8 User Guide TX Group Control
33
Chapter 10: TX Group Control
The TX Group menu provides access to commands that are applied simultaneously to All or custom groups of NexLinked transmitters assigned to
RX channels. Tap the Group Selector Button in OLED 1 to select the Group of transmitters to which commands should be sent to. Alternatively,
access the TX Group Control by selecting the Group at the top of the TX List menu and tapping the Group Ctrl button in OLED 4. The following
commands are supported:
● Power On/Off
● Record On/Off
● LEDs On/Off
● Mute On/Off
● RF Power
● Modulation
● Mode
● Format
● ID
If at least one transmitter does not respond correctly or match the command status, ‘Partial’ is displayed below the respective command’s buttons.
Partial status for REC, LEDs and Mute functions are only reported for transmitters that are powered on.
Tap the More … button to cycle between the two pages of group commands. Page 2 includes Modulation, Mode, Format, and ID.
Astral ARX8 User Guide RF Menu
34
Chapter 11: RF Menu
The RF Menu accesses antenna, tuning band, and RF History settings. From the Main Menu, tap the RF icon to enter the RF Menu.
11.1 Antenna Setup
The antenna inputs A and B can be switched as a pair between the front or rear panel BNCs. When set to front, the antenna’s matching rear BNC
can be set to Cascade Out, ideal for daisy chaining units.
When daisy chaining Astral ARX8, it is recommended to use an external powered antenna to overcome the 3 dB splitting loss in the Astral ARX8 so
that the receivers maintain excellent range.
● Antenna In button: Tap to toggle between the Front and Rear BNCs for the A and B antenna inputs.
● A, B Gear Icons: Tap to access settings for the A and B antennas.
○ Power (Bias): Provides 12 VDC bias power for active or smart antennas. When On, a lightning power icon appears next to the
antenna’s icon in the RF Menu. When setting Power (Bias) to On, a “Turn on Antenna Bias Power” prompt is displayed. Select
OK to turn on bias power.
○ Cascade out: When the Front/Rear antenna input button is set to Front, the rear BNCs can be set as cascade outs for daisy
chaining units. The Cascade out option is grayed out when the antenna BNC inputs are set to Rear.
○ Smart Antenna: Tap to enable remote control of the Wisycom LFA smart antenna. The LFA control settings are grayed out
when Smart Antenna is disabled. After turning power bias On, allow about 20 seconds for the smart antenna fields to become
accessible.
○ LFA Gain Mode: Sets gain of Antenna A or B in 1 dB steps. [Off, Bypass, -12 to 27dB].
○ LFA Gain: Sets gain of Antenna A or B in 1 dB steps. [Off, Bypass, -12 to 27dB].
○ LFA Filter Type: Sets the filter type of Antenna A or B.
○ LFA Filter Freq: Sets the filter freq of Antenna A or B.
○ LFA Name: Displays name of Antenna A/B.
○ LFA Display Brightness: Sets Antenna A/B display brightness in increments of 1. [1-10]
○ LFA Display Color: Sets Antenna A/B display color. [White, Black]
○ LFA Display Timeout: Sets the duration of Antenna A/B display timeout in steps of 1 second. [5 to 240 seconds]
○ LFA Display Rotate: Sets the rotation of the Antenna A/B display. [0 or 180]
○ LFA LED: Sets Antenna A/B LED activity. [On or Off]
○ LFA Version Info: Displays system information about the Wisycom LFA- B-F1.
Astral ARX8 User Guide RF Menu
35
11.2 Tuning Band
Sets the Astral ARX8’s Tuning Band and displays its trace across the rightmost screen. The Tuning Band can also be set from the RTSA. See RTSA
and Architectural Overview for more information.
11.3 RF History
The RF History plot is displayed in the 1RX, 4RX, and 8RX Views. It displays RF signal level (RSSI) or link quality history over a specified duration.
● Duration: Set from 30 to 600 seconds in 10 second steps.
● Type: Choose from the following:
○ RSSI: Displays Antenna A or B’s RSSI, whichever is the highest. Displayed a green bars.
○ Link Q: Displays Link Quality. Displayed as purple bars.
○ RSSI + Q: Displays RSSI, Link Quality, and RF overload status.
■ Purple bars for Link Q
■ Blue line for Ant A RSSI and
■ White line for Ant B RSSI.
■ Orange bars indicate that the antenna inputs are approaching overload and
■ Red bars indicate that the antenna inputs are overloading.
See Antenna RF Overload Indication below.
11.4 Antenna Length
For convenience, the Astral ARX8 includes a ¼ wave whip antenna length measurement view. Simply select the desired frequency range, line up
the whip antenna to the displayed graphic and cut to size.
Astral ARX8 User Guide Antenna RF Overload Indication
36
Chapter 12: Antenna RF Overload Indication
The Astral ARX8 indicates whether its A and B antenna inputs are approaching overload or overloading.
● Red = Overload
● Orange = Approaching overload
● Left indicator (in OLED 1) = A antenna overload status
● Right indicator (in OLED 4) = B antenna overload status
● The red and orange indicators are held for a minimum of 2 seconds. Tap the indicator to manually clear it for at least 10 seconds.
Tip: Things to try when an RF signal is approaching overload or overloading an antenna input:
● Increase the distance between transmitter and receiver antennas
● Reduce RF power on the transmitter
● If using amplified external antennas, reduce the amplifier gain
Use the RTSA screen to examine where the interference is coming from. If the interference is not from the transmitters in use but other sources,
consider changing the tuning band and frequency such that the interfering RF signal is moved out of band.
Astral ARX8 User Guide Spectrum Analyzer
37
Chapter 13: Spectrum Analyzer
The Astral ARX8 incorporates a real-time, spectrum analyzer for assisting in frequency coordination and selection of clean RF frequencies anywhere
within the entire SpectraBand range (169 MHz to 1525 MHz). The Spectrum Analyzer also includes:
AutoAssign: an algorithm that finds the cleanest frequencies and automatically assigns them to RX channels and their paired transmitters.
TV Channel Finder: an algorithm that automatically looks for and displays 6 MHz or 8 MHz TV Channels so that those frequency regions
can be avoided when assigning frequencies.
The analyzer is accessed from the RTSA menu, the RF menu, or by tapping the RTSA icon in OLED 1 of any menu.
The Spectrum Analyzer includes two Modes of operation:
1. RTSA Mode: Live real-time spectrum analysis of the currently selected band filter range while maintaining reception of multichannel
wireless audio. RTSA is an acronym for Real Time Spectrum Analyzer.
2. Scan Mode: Analysis of the entire or user-selectable portions of the 169 MHz - 1525 MHz spectrum. The trace is typically refreshed a few
times per second. All channel audio is muted in Scan Mode.
In both modes, RF signal level (in dBm) as ‘seen’ by each antenna is displayed on the vertical axis with RF frequency (in MHz) displayed on the
horizontal axis. Toggle between RTSA Mode and Scan Mode by tapping the Scan / RTSA button in OLED 4.
Recommended Workflow
It is best practice to first use the Scan tool to find the cleanest band, then use the RTSA or AutoAssign to find the cleanest frequencies within that
band. Once clean frequencies are found they can be assigned to receiver channels and their associated NexLinked transmitters directly from the
RTSA or AutoAssign views.
13.1 RTSA Mode
RTSA Mode displays live RF signal level for the current band filter range.
The RTSA View can be displayed on a single screen (touch screen 4) or expanded across all 4 touch screens.
Single Screen RTSA View in OLED
● From any RX View, show the single screen RTSA View on OLED 4 by tapping the RTSA icon at the bottom of OLED 4.
● Hide the single screen RTSA view by tapping the ‘X’ at the top right of the view.
● Change the vertical ‘dBm’ scale by tapping the up/down arrows.
● Switch to the expanded RTSA view by tapping the center of the screen.
● The single screen RTSA view is also displayed in the RF menu.
Expanded RTSA View
1
2
4
3
5
7
6
8
9
10
11
12
13
14
15
16
17
Astral ARX8 User Guide Spectrum Analyzer
38
Access the expanded RTSA View by tapping the center of the single screen RTSA View or by tapping the RTSA icon in the Main Menu or bottom of
screen 1 in other menus.
Exit the expanded RTSA View by pressing the triangle button.
1. Start Frequency: Shows the start frequency of the displayed plot.
2. Frequency Marker: Tap anywhere in the top half of the three OLEDs to locate the blue frequency marker at any desired frequency. To
more precisely position the marker, rotate the Control knob with the Zoom Tool set to horizontal scroll mode (blue Zoom Tool icon). The
marker can be used to identify a specific frequency and its received signal strength.
Press the Control knob to display the “Assign Frequency To:” list. Assign the blue frequency marker’s current frequency to any receiver
channel or select ‘Auto Assign All’ to automatically scan and assign multiple clean frequencies at once. See AutoAssign for more
information.
3. Marker MHz/dBm: Displays the Frequency Marker’s current frequency and dBm value.
4. End Frequency: Shows the end frequency of the displayed plot.
5. Antenna Options: Selects which antenna (Ant) signals are displayed.
a. Ant A: Only antenna A (red line)
b. Ant B: Only antenna B (white line)
c. Ant A+B: Highest of Ant A and Ant B.
d. Ant A, B: Both Ant A and Ant B.
6. Tuning Band: Sets the Astral ARX8’s Tuning Band and displays its trace across the first three screens. The Tuning Band can also be set
from the RF Menu.
A Tuning Band is a tightly filtered frequency band from within which Astral ARX8’s receiver channels must operate. RF signals outside the
selected tuning band are sharply attenuated to significantly reduce unwanted out-of-band RF interference. See Architectural Overview for
further information
● Tap the Tuning Band button. If System > More > Notifications > ‘Audio Off Warnings’ is enabled, a popup appears to warn that
audio will stop on all channels if the Tuning Band is changed. Select OK to display a list of the currently selected Country’s
Tuning Bands and their width in MHz. Country is set from the System menu.
● With the Tuning Band list open, rotate the Control knob to scroll through the list. To make it easy to select a Tuning Band with
the least amount of RF congestion, the Tuning Band and its RTSA display switches ‘live’ as the list is scrolled.
● Tap the Tuning Band list title bar to close the Tuning Band list.
Astral ARX8 User Guide Spectrum Analyzer
39
Tuning Band List
Quick Recall of a Tuning Band’s Assigned Frequencies
Each Tuning Band’s assigned receiver channel frequencies are stored and automatically recalled when selecting a Tuning Band. This is
particularly useful for:
a) Quickly comparing the RF performance of assigned freq groups as you switch between tuning bands.
b) Pre-configuring alternate tuning bands with pre-assigned frequencies to prepare for unforeseen changes in the RF environment.
Note: Each Tuning Band’s assigned frequency cache is cleared when Astral ARX8 is powered down.
7. Trace Type: Sets the trace characteristic.
a. Normal: Displays the live view of the spectrum seen by each antenna
b. Average: Displays temporally averaged (smoother) live view of the spectrum seen by each antenna.
c. Peak Hold: Displays and holds peak values. To reset, tap the Trace Type popup and tap Peak Hold.
d. Normal + Pk: Shows both Normal and Peak Hold traces.
e. Average + Pk: Shows both the Average and Peak Hold traces.
8. Show/Hide TV Channel: Tap to show or hide TV channels. When Show TV Ch is selected, Astral ARX8 analyzes the filter band to
discover and display TV channels.
9. Zoom Icon: Tap the Zoom icon to cycle the Control knob’s rotate function between the three zoom modes - marker locate (blue), zoom
horizontal (yellow), and zoom vertical (pink). Tapping to locate the frequency marker automatically changes the Zoom icon to the blue
marker locate function.
10. Stop/Start Button: Tap to start or stop the RTSA or Scan mode. Pressing stop freezes the current display.
11. Exclusions: Tap Exclusions to create or delete frequency Exclusion Regions. See Frequency Exclusion Regions for more info.
12. Scan/RTSA Button: Tap to switch between RTSA and Scan modes. When switching to Scan mode, the following popup is displayed if
System > More > ‘Show Audio Off Warnings’ is enabled.
“Changing to Scan Mode will stop audio on ALL channels. Continue? [OK, Cancel]”
13. Trace: The real time trace of the received RF spectrum.
14. Frequency Exclusion Region: Translucent red regions indicate user-created Frequency Exclusion Regions.
15. RX Channel Indicator: Indicates the frequency and channel number of an enabled receiver channel. The channel number and frequency
portion of the trace that is associated with that number, is highlighted orange. Tap the orange number to jump directly to that channel’s
1RX View.
16. TV Channel or Restricted Frequency Region:
a. A vertical gray region without a TV channel number indicates a restricted frequency region. It is not possible to assign a
receiver channel to frequencies within this region.
b. When ‘Show TV Ch is activated, a vertical gray region with a TV channel number identifies a discovered TV channel. It is
possible to assign a receiver channel to frequencies within a TV channel, but it is not recommended.
Note: In Scan Mode, TV Channel number labels are not displayed in the gray TV channel regions.
17. Vertical dBm scale: Displays the vertical dBm scale. Adjust the scale using the Pink Zoom Tool. Choose from +10 to -130dBm, -10 to -
130 dBm, -30 to -130 dBm, and -50 to -130 dBm
Astral ARX8 User Guide Spectrum Analyzer
40
13.2 Scan Mode
Use Scan mode to view the whole Astral ARX8 169 MHz - 1525 MHz spectrum and zoom in to see smaller sections in more detail. The complete
scan trace is refreshed a few times a second. Scan mode makes it quick and easy to find and select a clean Tuning Band. Access Scan mode by
tapping the Scan button in OLED 8 of the RTSA View. The Scan trace width and start/end points can be adjusted in several ways:
1. Tap ‘Scan Width’ at the top of OLED 3 to display the Scan Width popup. Enter a Start and End frequency of reset to the default 470-616
MHz setting.
2. Select the zoom horizontal tool by tapping the zoom icon in OLED 4 until the yellow zoom icon is displayed. Rotate the Control knob
clockwise to zoom in and counterclockwise to zoom out.
3. Tap '> to bank to the next range of frequencies with the same width. For example, if 470 to 616 MHz is currently displayed, tapping ‘>’ will
display 616 to 762 MHz
4. Tap '<' to bank to the previous range of frequencies with the same width.
Note: When entering Scan mode, the last selected range is shown.
Note: The scan trace shows the various selectable filter ranges as colored strips at the bottom of the display. Filter ranges can overlap. These
overlapping ranges are shown as gray strips.
To select a Tuning Band:
● Locate the vertical blue frequency marker within a Tuning Band, then press the Control knob to select the Tuning Band that the marker is
located in.
● If the blue frequency marker is located within an overlapping Tuning Band ’gray’ strip, pressing the Control knob will display a prompt
asking to select the Upper or Lower Band. Cancel the popup by pressing the triangle button.
● When a Tuning Band is selected, the RTSA mode is automatically selected for that Tuning Band.
Astral ARX8 User Guide Spectrum Analyzer
41
13.3 Exclusion Regions
Create Exclusion Regions to prevent RX channel frequencies from being manually assigned or AutoAssigned to specific frequencies or frequency
ranges. This can be helpful in avoiding certain blocks of frequencies that are reserved for other uses e.g. IEMs. Up to 12 Exclusion Regions can be
created.
Note: An Exclusion Region can span neighboring filter ranges.
Note: The vertical blue frequency marker used for assigning frequencies cannot be located within an Exclusion Region.
Exclusion List
From the RTSA or Scan Mode view, tap the Exclusions button in OLED 4 to display the Exclusions List.
The Exclusion List displays all created Exclusion Regions. Rotate the Control Knob to scroll through the list and highlight a region for editing. A new
Exclusion Region can be created by selecting the ‘+’ button, the last item in the list.
Creating an Exclusion Region
1. Tap Exclusions in OLED 4 to display the Exclusion list. The frequency marker changes from blue to red.
2. Tap ‘+’ to create a new Exclusion Region centered on the red frequency marker.
Note: If there are 3 or more exclusion regions already in the list, rotate the Control Knob clockwise to scroll to the ‘+’ button at the bottom of the list.
The new Exclusion Region appears in the spectrum as an orange-bordered red region with a default width of 0.4 MHz (400 kHz). The
frequency cell in OLED 4 is automatically highlighted orange indicating it is ready to be set.
3. There are two methods for creating Exclusion Regions. Toggle between the two methods with the bottom left button in OLED 4 labelled
either ‘Start End’ or Freq Width’.
a) Using the Frequency and Width method.
a. Set the Exclusion Region’s center frequency by rotating the Control Knob or tapping anywhere in the spectrum.
b. Set the Exclusion Region’s width by tapping the width cell so that it is highlighted orange then rotate the Control Knob.
c. Tap the width cell to deselect it.
b) Using the Start and End frequency method.
a. Tap the Start cell then set the start frequency by rotating the Control Knob or tapping anywhere in the spectrum.
b. Tap the End cell then set the end frequency by rotating the Control Knob or tapping anywhere in the spectrum.
c. Tap the End cell to deselect it.
4. Repeat steps 2-3 to create additional Exclusion Regions.
5. Tap Done to Exit the Exclusion List.
Selecting an Existing Exclusion Region for Editing or Deleting
1. Tap Exclusions in OLED 4 to display the Exclusion List.
2. Select an Exclusion Region by scrolling through the Exclusion List or tapping a Region on the spectrum display. The selected exclusion
region is indicated by an orange border.
3. Once selected, tap a Start, End, Frequency, or Width cell to edit the Exclusion, or tap the Delete button and choose whether to delete the
selected Exclusion Region or All Exclusion Regions.
Astral ARX8 User Guide AutoAssign
42
Chapter 14: AutoAssign
Use AutoAssign to find and automatically assign multiple clean frequencies to selected RX channels. AutoAssigned RX Channel frequencies are by
default, automatically sent to their assigned NexLinked transmitters.
The AutoAssign Process
AutoAssign performs the following steps:
● Disables RF for those transmitters assigned to selected RX channels. (RX channels are selected by tapping the Select Channels button in
the AutoAssign view)
● Stops audio on all channels.
● Analyzes the selected AutoAssign range for clean frequencies and assigns them to enabled RX channels and their paired transmitters.
● RF is re-enabled for those transmitters that were ON prior to the AutoAssign process.
● If it is not possible to find clean frequencies for all the selected RX channels, a popup displays how many channels out of the total were
assigned.
How to Start the AutoAssign Process
1. Tap the Main Menu > AutoAssign icon. The RTSA View appears with the full tuning band range highlighted blue. The AutoAssign Range
popup is displayed in screen 4 with the Start button already selected.
2. Tap Select Channels in OLED 4 to display the Select Channels popup. Choose channels to AutoAssign, then tap Done.
3. Tap OK to start the AutoAssign process.
4. From the RTSA:
a. Tap the display or rotate the Control knob to position the AutoAssign vertical start marker at the frequency where the
AutoAssign range should start.
b. Tap the End button in OLED 4, then tap the display or rotate the Control knob to position the AutoAssign vertical end marker at
the frequency where the AutoAssign range should end.
c. Tap Select Channels to display the Select Channels popup. Choose channels to AutoAssign, then tap Done.
d. Tap OK to begin analyzing the selected range.
Note: By default, the full range of the band is selected.
Note: It is not possible to select a range less than 1 MHz
Note: It is not possible to set an End frequency lower than the Start frequency.
AutoAssign can also be instigated from the RTSA View.
1. Press the Control knob to display the ‘Assign Frequency To:’ list.
2. Select ‘Auto Assign’.
Note: Channels are not necessarily assigned in numerical order from lowest to highest frequency.
Astral ARX8 User Guide Audio Outputs
43
Chapter 15: Audio Outputs
The Astral ARX8 has 16 audio outputs which can be fed from up to 8 receiver main/aux paths. Multiple receiver channels can be summed to any
audio output by assigning them to the same main or aux path from their 1RX Views. These 16 audio outputs are fed to other devices via the analog
and AES physical output interfaces. All Audio and Sync settings are configured from the Audio Out Menu. When docked to an 8-Series
mixer/recorder, the Astral ARX8’s multichannel outputs are output via the expansion port to the 8-Series and Astral ARX8’s analog and AES outputs
are disabled. Audio Outputs are configured in the Audio Out Menu.
15.1 Routing
Routing Astral ARX8 Audio when Docked to an 8-Series Mixer/Recorder
From an 8-Series channel screen, select any one of the Astral ARX8’s audio outputs as channel source. Astral ARX8 outputs are only shown when
an Astral ARX8 is docked via the expansion port and enabled via the 8-Series System > Expansion Port menu.
833 Mixer/Recorder Channel Screen
Routing Astral ARX8 Audio to Analog or AES Outputs
Configure what to output from the D-Sub connector in the Audio Out > D-Sub list. The options are:
Disabled
Out 1-8 → Line
Out 1-8 → 10
Out 1-8 → Mic
Out 1-8 → AES
Out 1-8 → Guitar
Out 9-16 → Line
Out 9-16 → 10
Out 9-16 → Mic
Out 9-16 → AES
Out 9-16 → Guitar
Astral ARX8 User Guide Audio Outputs
44
15.2 Audio Out Sample Rate
● The sample rate of the AES digital outputs is determined by the Audio Out > Sample rate and Sync Reference settings.
● The Astral ARX8 outputs digital audio at 44.1, 48, or 96 kHz sample rates. Factory default is 48 kHz.
● The sample rate can only be set when the Sync Reference is set to Internal or BNC In (when receiving timecode). Otherwise, the sample
rate field is read-only.
15.3 Audio Out Sync Reference
The Astral ARX8’s AES outputs can be synced to the following sync reference sources:
● Internal
● BNC In (Word Clock or LTC). The Astral ARX8 auto-detects whether the incoming signal is word clock or timecode
● 8-Series (automatically selected when docked to an 8-Series)
The following table indicates how the digital output sample rate is determined for each type of sync reference source:
Sync Reference
Astral ARX8 Sample Rate Setting
Internal
44.1k, 48k or 96k
BNC In (Word Clock)
Determined by incoming Word Clock frequency
BNC In (LTC)
44.1k, 48k or 96k
8-Series (automatically selected
when docked to 8-Series)
Determined by the 8-Series sample rate. Timecode and sync reference are
received from the 8-Series.
● If the selected sync reference input is not detected, the Astral ARX8 switches to its internal clock AND the Control knob ring LED flashes
orange to indicate that the selected sync reference is not present or invalid.
● When synced to Internal, the BNC In can still be used as an LTC source.
15.4 Tone Generator
Enable the Tone Generator to send a tone (sine wave) at a specific level and frequency to selected RX Channel outputs. The tone level can be
adjusted from -20 to 0 dBFS and the tone frequency from 10 Hz to 20 kHz. When the Tone toggle is enabled, a popup appears confirming whether
to turn on the tone or not. Tap Yes or No.
Tap Tone Routing to display Tone to RX channel routing screens. Select which RX channel outputs to route the tone to. When activated, the tone
signal will be viewable on the selected RX channel audio meters in the RX Views. Tone on selected RX channels is fed to external devices by
routing them to physical analog and digital outputs via the main and aux feeds to Audio Outs 1-32 in OLED 2 of the 1RX Views. To output via analog
or AES, make sure to select the applicable Audio Outs in the D-Sub source drop down lists. Audio Outs 1-32 are directly fed 1:1 to Dante outputs 1-
64.
15.5 Audio Meters
Audio meters for Audio Outs 1-32 are displayed in OLED 4. The meter scale uses colors to signify level thresholds as follows:
● Green: up to -20 dBFS
● Yellow: -20 to -12 dBFS
● Orange: -12 to -1 dBFS
● Red: 0 dBFS, clipping
Astral ARX8 User Guide Timecode
45
Chapter 16: Timecode
With NexLink, the Astral ARX8 can simultaneously sync multiple Astral transmitters when they are set to REC only or REC+RF mode. This feature
ensures zero-frame drift between multiple recording transmitters and therefore making it easy to sync with picture in post especially when the free
SD-Utility software tool
(https://www.sounddevices.com/sd-utility-v2-00/) is used to conform and merge the individual Astral transmitter recordings into a single polyphonic
wav file.
The Timecode menu displays BNC input LTC and its frame rate. Tap the timecode slate icon in the Main Menu to access the Timecode menu. The
incoming timecode is displayed below the icon making it unnecessary to enter the Timecode menu to check valid timecode is being received.
Enable the 75-ohm BNC input termination in OLED 3 to ensure optimum signal integrity and prevent signal reflections. This applies to both WCK
and LTC signals.
The Astral ARX8 receives timecode in two possible ways:
1. From the rear panel LTC/WCK BNC In port. The Astral ARX8 automatically detects whether a word clock or timecode signal is
connected. When the source is timecode, the frame rate is automatically detected.
2. From the 8-Series when docked via the expansion port. When docked to the 8-Series, the Astral ARX8’s BNC In port is disabled and
timecode and sync are received from the 8-Series. Use the 8-Series Timecode/Sync menu to set up timecode and sync as necessary.
16.1 Syncing Astral transmitters to Astral ARX8 timecode.
● The Astral ARX8 will automatically sync timecode to all Astral transmitters when a timecode source is plugged into the BNC In port. When
synced, the Astral transmitters blink their blue timecode LED for about 10 seconds and the Astral ARX8 displays ‘TC synced’ in transmitter
1RX View > TC menus (accessed by tapping the TC Icon).
● An Astral transmitter is also synced from the Astral ARX8 by connecting its USB-C port to the Astral ARX8 USB-A port while in the
Timecode menu. When connected, the Timecode Menu displays a Sync Astral button at the bottom of screen 4.
● The top of screen 1 displays how many of the NexLinked transmitters are synced.
Astral ARX8 User Guide NexLink Menu
46
Chapter 17: NexLink Menu
The Astral ARX8 can wirelessly control and monitor Astral transmitters via NexLink over long distances.
Tap the NexLink Menu Icon in the Main Menu to access NexLink settings.
Manually Set Frequency, Modulation, and Privacy on Transmitters
Determines whether Astral transmitter frequency, modulation, & privacy settings are automatically or manually sent from the Astral ARX8 to the
Astral transmitter over NexLink. When the toggle switch is off, these settings are automatically sent from Astral ARX8 to the transmitters. When the
toggle switch is on, it is necessary to manually set frequency, modulation, & privacy on both the Astral ARX8 & TXs. Note: If these settings do not
match between the Astral ARX8 and TXs, audio is not received.
17.1 NexLink Status Alerts
The NexLink Status View allows you to monitor NexLink communication between the Astral ARX8 and Astral transmitters. This can assist in
resolving NexLink issues. Access the NexLink Status View from the 1RX View Gear menu, TX View Gear menu, or, if the channel is sourced from
multiple transmitters, directly from the 1RX View’s NexLink Status button.
A receiver channel’s Gear icon, NexLink Status button, and RF Frequency display turn red when there is a NexLink error.
NexLink Status Alerts
Message
Text Color
Description
Searching for transmitter
Yellow
An Astral transmitter has been linked to the Astral ARX8 but NexLink communication
to the transmitter has not yet been established or has been lost. The transmitter may
be out of range, or its battery drained.
Transmitter powered off
White
An Astral transmitter is NexLinked to Astral ARX8 and is powered off.
NexLink connected
Green
An Astral transmitter has been successfully NexLinked to Astral ARX8
UHF frequency synchronized
Green
The frequency of the transmitter matches that of the receive channel that it is
assigned to.
Modulation synchronized
Green
The modulation of the transmitter matches that of the receive channel that it is
assigned to.
Frequency mismatch.
Set the transmitter frequency.
Red
The frequency of an assigned transmitter does not match that of the receive channel.
Manually set the transmitter frequency to the same frequency as the receiver channel
or set the Astral ARX8’s NexLink Tuning Mode to ‘Push’.
Modulation mismatch.
Set the transmitter modulation.
Red
The modulation setting of an assigned transmitter does not match that of the receive
channel. Manually set the transmitter’s modulation to the same modulation as the
receiver channel or set the Astral ARX8’s NexLink Tuning Mode to ‘Push’.
Privacy key mismatch.
Set the transmitter privacy key.
Red
The privacy key setting of an assigned transmitter does not match that of the receive
channel. Manually set the transmitter’s privacy key to the same modulation as the
receiver channel or set the Astral ARX8’s NexLink Tuning Mode to ‘Push’.
Country conflict.
Change the transmitter country.
Red
The country code of the transmitter does match that of the Astral ARX8. No
synchronization of settings will be done until these match. Either change the country
from Astral Remote or from the Astral ARX8.
No receive frequency.
Set the receive frequency
White
The frequency of the receive channel is set to 'Off’. In the 1RX or 4RX View
frequency popup, set the channel to a valid frequency & ensure the channel is ‘On’.
Astral ARX8 User Guide System Menu
47
Chapter 18: System Menu
Tap the System Icon in the Main menu to access System settings. The System menu includes various system settings organized over two pages.
Switch to the 2nd page by tapping the ‘More >>’ button.
System menu page 1
18.1 Pair to Astral Remote App (Locale Settings)
The Astral ARX8 must be paired with the Astral Remote iOS /Android app to set Country and activate Frequency Authorizations on Astral ARX8 and
its paired transmitters.
● Download the Astral Remote iOS or Android app from their respective App stores
● Open the app and select the Manage Devices view
● From the Astral ARX8 > System menu, tap ‘Pair to Astral Remote App’
● The Astral ARX8, along with its name and firmware version automatically appear in the Astral Remote’s Manage Devices List
18.2 Country
The Country setting determines which Tuning Bands, RF frequencies, and transmit powers are legally available for selection in a Country.
● Astral ARX8 and Astral transmitters must be set to the same Country.
● When the Country setting is changed, Astral ARX8 must restart for the changes to take effect.
● Changing the Country setting sets the Tuning Band to the default filter range for that Country.
● If the Astral ARX8 and an Astral transmitter’s country settings are not matched, a warning popup appears in OLED 1 as follows:
“Cannot use 1 or more TX as they are set to a different country than the Astral ARX8. Change country on the Astral ARX8 or the
TX from the Astral Remote App.”
Country, OK.
The Astral ARX8 can quickly change the country setting of all its paired transmitters automatically to make changing locations very easy.
To accomplish this, the Astral ARX8 uses the Astral Remote iPhone/Android app along with a smartphone’s GPS to verify the current
location; the Astral ARX8 must be paired with the Astral Remote app.
Astral ARX8 v8.20
Astral ARX8 User Guide System Menu
48
Once Astral ARX8 is paired, use Astral Remote to sync the mobile device’s country (determined by the mobile device’s location services) and
date/time to the Astral ARX8.
18.3 Syncing Astral Remote’s Country, Date, & Time to Astral ARX8.
○ Select the Astral ARX8 in the Astral Remote app’s Device List (left pane).
○ In the Astral ARX8’s Details View (right pane), tap the “Synchronize Date/Time and Country” button.
○ When successfully synchronized from Astral Remote, the Astral ARX8’s Country button displays the updated Country setting in
green font and its Date/Time button displays the updated date and time. The Astral Remote app displays "Country Changed.
Changing the country will not take effect until the Astral ARX8 is restarted.”
○ Restart the Astral ARX8 for the Country setting to take effect.
Once the Astral ARX8 is synced and restarted, it relays its Country and Date/Time information automatically to all NexLinked transmitters.
If the Astral Remote app is not available to sync Country to Astral ARX8, tap the Astral ARX8’s Country button to manually set the Country. In this
case, the Country setting is not automatically pushed to the transmitters. The following message is displayed: “A manually selected country will not
be automatically pushed to transmitters. Choose one anyway? Yes, No”
Tap ‘Yes’ to select a country from the list. “Changing the country will restart the unit. Continue?” is displayed. Tap OK to restart.
When manually setting the country on Astral ARX8, be sure to also manually set the Astral transmitters to the same country using Astral Remote.
Refer to the Astral transmitter user guides for more information. If the Astral ARX8 and an Astral transmitter’s country settings are not matched, a
warning popup appears in OLED 1 as well as a ‘Country conflict’ alert in the NexLink Status screen.
Astral ARX8 User Guide System Menu
49
18.4 Frequency Authorization
Displays information pertaining to frequency authorizations. The button is grayed out if no valid Frequency Authorizations are loaded. See Restricted
Frequency Authorization for further details.
● Authorization ID/Status: A Frequency Authorization can be “active” or “inactive”. In either case, the presence of the frequency
authorization unlocks in the Astral ARX8 and paired transmitters the ability to tune to the frequencies and desired RF power levels listed.
Only an “active” Frequency Authorization allows a transmitter to actually transmit RF on frequencies or at power levels not allowed in the
transmitter’s current country. A Frequency Authorization must be “activated” by the paired Astral Remote app which determines whether
the mobile device is within the effective time period, country and geolocation. If so, Astral Remote then activates the Frequency
Authorization in the Astral ARX8 and its paired transmitters.
To activate a frequency authorization:
○ In Astral Remote > Manage Devices > Frequency Authorizations, enter your approved Authorization ID (contact
RF_Request@SoundDevices.com to obtain the necessary authorization.
○ Tap the Submit button.
○ Select a paired Astral receiver in the Astral Remote’s Device List and tap ‘Send Frequency Authorization’. ‘Successfully sent
Frequency Authorization’ is displayed.
○ Tap the Astral Receiver’s System > Frequency Authorization button to access the Frequency Authorization view. ‘Pending
Restart’ is displayed in yellow if the authorization was received successfully. Restart the receiver.
○ Go to the Frequency Authorization view again to confirm that the authorization is loaded and displaying ‘active’ in green font.
○ Activate the authorizations in paired transmitters by restarting them.
● End Date/Time: The Date/Time where the authorization becomes inactive.
● Frequency Range / RF Power: Up to 8 frequency ranges and their associated max RF power levels that are authorized to be used when a
Frequency Authorization is active.
● Tap Delete Authorization to remove the frequency authorization. It will be removed from the Astral ARX8 and paired transmitters upon
next bootup of each device.
Astral ARX8 User Guide System Menu
50
18.5 Miscellaneous Settings
Date/Time
The Astral ARX8’s Date/Time has two purposes:
1. Sends the date/time to Astral transmitters where the value is used to set the creation time of the Astral transmitter recorded files.
2. Sets the creation date/time of Astral ARX8 Quick Setup files.
Tap Date/Time to bring up the Date/Time popup, then enter MM/DD/YY and HH/MM/SS. In each field, rotate the Control knob to set a value, then
press the Control to jump to the next field. Tap Done to store.
Time Zone
Set the time zone from GMT -12:00 to GMT +13:00
Show All TX Group
Shows or hides the All TX Group at the top of the TX List
Brightness
Tap to adjust the brightness of the OLED array and the LEDs.
Screensaver
The screensaver can help prevent OLED burn in. The screensaver time sets the duration from when the OLEDs were last touched to when the
OLEDs display the screensaver. Select between 1 min, 5 mins, 15 mins, 30 mins, and never. The screensaver is canceled upon the touch of any
front panel control.
Lockout Mode
Enable Lockout Mode to prevent unauthorized or accidental access to front panel controls including OLEDs, HP Encoder and triangle button. When
Lockout mode is enabled, the HP encoder ring LED is backlit green to indicate that the Astral ARX8 is still on.
To enable Lockout mode from the Astral ARX8, tap the Lockout Mode button. The following popup is displayed:
“Are you sure?
To disable Lockout, tap the
left display whilst pressing HP.
OK, Cancel”
To disable Lockup Mode, tap the left display whilst pressing the HP knob.
Note: You can also use Show Mode to prevent accidental changes to the front panel screens - this disables touch essentially making the screens
read-only. Press and hold the Control knob for 3 seconds to toggle Show Mode on/off. When on, an orange border is displayed around each screen
and if a screen is touched, a ‘The screen is locked’ popup appears.
System menu page 2
Notifications
Astral ARX8 User Guide System Menu
51
The Notifications popup menu provides options for enabling or disabling various notification popups from being displayed including:
1. Power Off Confirmation: When set to ON, powering off a transmitter from a 1RX View displays “Are you sure?”. Tap OK to power off the
transmitter. Use this function to prevent accidentally powering down transmitters.
2. Stop Confirmation: When set to ON, stopping a transmitter from recording from a 1RX View displays “Are you sure?”. Tap OK to stop the
transmitter recording. Use this function to prevent accidentally stopping recording.
3. Mute Confirmation: When set to ON, muting a transmitter from a 1RX View displays “Are you sure?”. Tap OK to mute the transmitter. Use
this function to prevent accidentally muting transmitters
4. RF Off Confirmation: When set to ON, setting RF to off on a transmitter from a 1RX View displays “Are you sure?”. Tap OK to disable RF
on the transmitter. Use this function to prevent accidentally disabling RF on transmitters.
5. Audio Off Warnings: When the toggle is off, the Astral ARX8 does not show a warning popup that audio will stop when switching Bands
and when switching to Scan mode.
6. Tx Battery Warnings: When the toggle is On, the Astral ARX8 flashes all its OLED’s borders red and displays a warning popup to indicate
one of the paired transmitters is low on battery. Choose to ignore the warning or tap OK, in which case the warning will reappear.
Format USB Drive
A USB drive connected to the USB-A port can be used for updating firmware and saving quick setup files. Before using the USB drive, it must be
formatted by the Astral ARX8.
● Tap Format USB drive, then select OK in the popup.
● USB Drives are formatted as FAT32.
Plugins
Tap Plugins to display and install licenses and plugins.
Firmware Update
See Updating Firmware
Legal/Patent
Displays legal and patent information for the Astral ARX8 across all OLED screens.
System Info
Displays model name, firmware version, and serial number
<< Back
Tap to go back to page 1 of the System menu.
Astral ARX8 User Guide Quick Setup Menu
52
Chapter 19: Quick Setup Menu
Quick Setup provides a way to save and load Astral ARX8 settings. Settings are saved to internal memory slots 1-4 or to a USB thumb drive
connected to the USB-A port.
Save Setup
● All Astral ARX8’s current settings are saved when saving a setup.
● Saving to an internal memory slot overwrites the existing setup file.
● Tap Erase Memory Slots to erase internal memory slots 1-4.
● Tap Save Setup to display a list of destinations (4 internal memory slots and USB thumb drive). Select a destination then use the virtual
keyboard to name the setup. Tap Save to store the current Astral ARX8 settings.
● During the save process, “Saving Setup …” is displayed.
Load Setup
● Choose which categories (Channel, RF, RTSA/Scan, Audio, Other) to load. This allows you to select only the settings you want to change
and which ones you want to remain.
● Tap Load Setup to bring up a list of the setup files stored in the four internal memory slots and USB drive. Selecting a setup from the list
loads the selected categories from that setup. During the load setup process, “Loading Setup …” is displayed.
Category
Setting
Channel
RF Frequency
Modulation
Privacy key
RX On/Off
Transmitters assigned to channel
Polarity
Gain
HPF
RF
Rear/Front Antenna Select
Astral ARX8 User Guide Quick Setup Menu
53
A and B Antenna Bias Power
A and B Antenna Cascade out
Current Tuning Band
RF History duration
RF History Type
NexLink Tuning Mode (Automatic or Manual)
RTSA/Scan
RTSA/Scan Zoom Mode
RTSA/Scan Vertical dBm Scale
RTSA/Scan Antenna Display Selection
RTSA/Scan Antenna Display Characteristics
Scan Width
Bandwidth
Audio
Top D-Sub Output Routing and Analog Output Level
Bottom D-Sub Output Routing and Analog Output Level
Headphone Out Routing
Headphone Out Gain
Sync Reference and Sample Rate
Other
Brightness
Screensaver
DC Out 1
DC Out 2
Turn On when Power is Applied
Time Zone
Notification settings
Default Settings
The Load Setup list also includes a ‘Default Settings’ option for restoring the Astral ARX8 to default settings. Selecting default settings unpairs
transmitters from the TX List, clears settings, and erases memory slots. The ARX8 must reboot to complete the process.
Astral ARX8 User Guide Updating Firmware
54
Chapter 20: Updating Firmware
Periodically Sound Devices issues new firmware for the Astral series. Make certain to register your products at the Sound Devices website to
receive firmware update notifications.
Firmware updates are instigated from the System > Firmware Update menu. You can choose to update Astral ARX8 only, paired individual
transmitters, all paired transmitters, custom groups of paired transmitters, or all devices. When more than one device is selected, updates take place
sequentially with the Astral ARX8 updated last.
Paired transmitters are updated wirelessly from the Astral ARX8 via Bluetooth. Wirelessly updating a transmitter requires that it is powered on. Once
a PRG file has been completely sent to the transmitter, it automatically begins updating.
Note: Transmitters can also be updated via micro-SD card or USB-C. See the Astral transmitter user guides for further information.
1. Download new PRG update files for your Astral ARX8 and transmitters from the Sound Devices website at
https://www.sounddevices.com/download/
2. Copy the PRG files to the root of a USB thumb drive formatted by the Astral ARX8. See System menu.
3. Insert the USB thumb drive into the rear panel USB-A port.
4. Access the System > Firmware Update to access the Firmware Update menu.
5. Scroll the list in OLED 2 to select which device(s) to update.
a. Highlight Astral ARX8 to update Astral ARX8 only
b. Highlight a transmitter to update only that transmitter
c. To update more than one device, highlight the top row to open the Select Devices list, then choose:
i. All Devices (Astral ARX8 and all paired transmitters)
ii. All Transmitters
iii. Transmitter Group 1-8 (Not available if transmitters have not been assigned to a group. Assign transmitters to a group
via the Group column cells)
6. Tap the Start Update button in OLED 4 to display the ‘Choose [model name] update file’ list.
7. Select the applicable PRG update file for your device. If more than one device has been selected for update, a list is presented
sequentially for each model. Once the last model’s update file has been selected, tap OK to start the update process or Cancel to exit.
Update progress & status is displayed in the status view in OLED 3.
8. Once firmware has been updated successfully, ‘Update complete’ is displayed in the status view. See Update Status below.
Note: To wirelessly update paired transmitters, they must be powered on.
Note: Once Astral ARX8 has updated, it automatically restarts and displays “Unit has been updated.”
Note: Updating ARX firmware clears its TX List (unpairs all transmitters).
Astral ARX8 User Guide Updating Firmware
55
20.1 Firmware Update Status
Device firmware update progress and status is displayed in OLED 3. Status is reset when Astral ARX8 is restarted.
Status Display
Description
PRG update file is being sent wirelessly to the transmitter
Transmitter has received the PRG update file and is now updating. The Transmitter LEDs
flash red, green, and blue
Device has updated successfully. Device must restart before this status is displayed
Device update process has been aborted by the user
Selected PRG file is incompatible with the selected device. Update aborted
Transmitter is out of range - bring closer to the Astral ARX8
Or battery is dead - replace with charged battery
Transmitter battery is too low to begin updating. Update aborted
Battery is considered too low when in the red state
20.2 Aborting a Firmware Update
Abort sending a PRG file to a transmitter
Highlight the transmitter that is currently being sent an update file and tap the ‘Abort Update’ button. Tap OK to abort or Cancel to continue sending
the PRG file.
Abort Pending (Queued) Device Updates
Highlight the top row and tap the ‘Abort Update’ button or tap the left arrow in OLED 1 or the triangle button. Tap OK to abort pending updates or
Cancel to continue updates uninterrupted.
Note: It is not possible to abort an Astral ARX8 update once it has started.
20.3 Refresh List
Press the Refresh List button to update the current list of connected devices. This list is automatically refreshed upon entering the Firmware Update
menu. Use the Refresh List button only if you have remained in the menu for an extended period and the connected devices may have changed.
Astral ARX8 User Guide Channel Expansion Licenses
56
Chapter 21: Channel Expansion Licenses
The Astral ARX8 can be expanded from 4 channels to 6 or 8 channels by purchasing one or two 2-channel Expansion Licenses from the Sound
Devices website. Permanent or rental licenses (7-day or 30-day) are available.
Channel Expansion licenses are installed via a USB thumb drive inserted into the Astral ARX8 USB-A port.
To install a license
1. Download the purchased license (.lic file) from the Sound Devices website.
2. Copy the license to the root of a USB thumb drive that has been formatted by the Astral ARX8.
3. Insert the USB thumb drive into the rear panel USB-A port.
4. Access the System menu, tap More …, then tap Plugins.
5. Tap Install.
Once installation has finished, the Astral ARX8 will automatically restart.
Astral ARX8 User Guide Accessories
57
Chapter 22: Accessories
22.1 Included
● 2x Monarch Antennas
● 2x Articulating Arm with ¼”-20 mount for Mounting Monarch Antennas
● 2x 30” BNC to BNC Antenna Cables
● 2x 2.4 GHz Antennas, SMA-M
● 2x Astral 2.4G Ant+Mount for Mounting to Astral ARX8 Side Panels
● 4x Rubber Feet
● Astral ARX8 Product Document
● Audio Product Portfolio Brochure
● 2x Promo Stickers
22.2 Optional
● Astral QuickDock
● Monarch Antenna (inc. articulating arm, BNC to BNC cable, BNC to SMA cable)
● Astral RX Shelf
● 2.4 GHz Antennas, SMA-M (set of 2)
● Astral 2.4G Ant+Mount
● XL-WPTA4 Power Supply
● Astral VHF Dipole BNC (set of 2 VHF antennas)
Astral ARX8 User Guide Accessories
58
22.3 Astral QuickDock for 8-Series
The Astral QuickDock enables the Astral ARX8 to be docked to 833, 888, or Scorpio mixer-recorders. The bottom panel incorporates a multi-pin port
that connects power from the 8-Series and passes the multichannel receiver digital audio from Astral ARX8 to the 8-Series.
When docked on an 8-Series:
● Power must be provided by the 8-Series - Astral ARX8 TA4 DC input is disabled.
● The Astral ARX8 and its NexLinked transmitters are controlled from the Astral ARX8 front panel. The 8-Series user interface is not used
for control.
● Most Astral ARX8 rear panel connectors are disabled, apart from the antenna connectors, the USB-A port, and the DC Outs.
● The USB-A port has the following capabilities when Astral ARX8 is docked on an 8-Series:
○ Pairing Astral transmitters to the Astral ARX8 by connecting a USB-C cable from the transmitter to the USB-A port.
○ Attaching a USB keyboard for entering text directly (e.g. receiver channel names) into the Astral ARX8.
○ Mounting a USB thumb drive for updating Astral ARX8 firmware.
○ Jamming 8-Series timecode to an Astral transmitter via the Astral ARX8.
Attaching Astral ARX8 to an 8-Series
The Astral QuickDock accessory is required to mount the Astral ARX8 to an 8-Series mixer/recorder.
The Astral QuickDock comes with the following parts:
● Mounting plate with detachable Quick Release mechanism and multi-pin connector.
● 2 mm and 1/16” Allen keys.
● Four 1/16” Allen screws for securing the mounting plate to the bottom of the Astral ARX8.
● Three long 2 mm and two short 2 mm Allen mounting pillars for securing the rear of the Astral ARX8 with mounting plate to the top of the
8-Series.
● Additional mounting brackets and screws for Scorpio.
Use the following instructions for mounting and unmounting the Astral ARX8 to an 8-Series mixer/recorder.
1. Ensure both Astral ARX8, and 8-Series do not have power applied.
2. Place the Astral ARX8 upside down on a clean, flat surface.
3. Position the QuickDock mounting plate on the bottom of the Astral ARX8
Astral ARX8 User Guide Accessories
59
a. Align the four mounting plate holes (1) with the screw holes on the bottom of the Astral ARX8.
4. Secure the mounting plate.
a. To make it easy to secure the mounting plate with the four Allen screws, temporarily detach the Quick Release mechanism from
the mounting plate (if not already done so) by squeezing together both the rear red levers and lifting.
b. Using the 1/16” Allen key, secure the mounting plate by screwing the four Allen screws into screw holes (1)
c. Reattach the Quick Release mechanism. Squeeze both the rear red release levers and locate the quick release mechanism so
that the multi-pin connector mates with the expansion port on the Astral ARX8. Firmly press down and ensure the quick release
mechanism is flush with the surface of the mounting plate.
d. Scorpio only: Attach the two additional Scorpio mounting brackets using 2 screws per bracket as shown below.
Scorpio Only Brackets
1
1
1
1
Astral ARX8 User Guide Accessories
60
5. On the 8-Series, screw in the five mounting pillars.
a. Replace three screws (2) with the three long mounting pillars. Note: For Scorpio, only the top right corner screw (2) and bottom
right pillar screw (2) need to be replaced with mounting pillars.
b. Screw in the two short mounting pillars into screw holes (3). Note: For Scorpio, use the two screw holes just below and either
side of the bottom 16-pin expansion port.
2
2
(not needed for Scorpio)
2
3
3
Astral ARX8 User Guide Accessories
61
6. To mount the Astral ARX8 with attached Astral QuickDock to the top of the 8-series:
a. Start by hooking the Astral ARX8 mounting plate onto the two rear mounting pillars (833 and 888) or one rear mounting pillar
(Scorpio).
b. Next, squeeze both front red release levers together and press down firmly on top of the Astral ARX8. Once located in place,
release the red levers.
c. Finally, slide the Astral ARX8’s front-right black latch over the front-right 8-series mounting pillar.
Astral ARX8 User Guide Accessories
62
7. To undock the Astral ARX8 from the 8-Series,
a. Slide the Astral ARX8’s front-right black latch off the 8-Series mounting pillar.
b. Squeeze both the front red release levers and lift the Astral ARX8 from the front.
c. Slide out the Astral ARX8 towards the rear of the 8-Series to unhook.
22.4 Monarch Antenna
The Astral ARX8 ships with two Monarch, omnidirectional, wide-bandwidth (470-1525 MHz) antennas. These antennas provide uniform coverage
and gain across the exceptionally wide SpectraBand tuning range of Astral ARX8. Each antenna is paired with a multi-function clamp and
articulating arm, as well as an RG58 BNC-M to BNC-M cable (30 in.)
When purchased as a separate accessory, the Monarch antenna also includes an RG174 BNC-M to SMA-M cable (18 in.)
The Monarch kit comes with the following parts:
● 1x Monarch antenna with BNC-F connector and 1/4"-20 female threaded mount
● 1x adjustable clamp and articulating arm with ¼”-20 male threaded mount
● 1x 30 in/75 cm BNC-M to BNC-M cable
● 1x 18 in/45 cm BNC-M to SMA-M cable
22.5 Astral RX Shelf
The Astral RX Shelf is a 1RU, 19” rack shelf designed to accommodate two Astral ARX8 or one Astral ARX8 and one PowerStation-8M side by side.
The shelf’s rack ears have multiple fixing holes allowing the depth of the shelf to be adjusted. An Astral ARX8 or PowerStation-8M can be mounted
to the left, center, or right of the shelf. The Astral RX Shelf kit comes with the following parts:
● 1x rack shelf
● 2x rack ears
● 6x rack ear screws
● 8x mounting screws for securing in place two Astral ARX8 or PowerStation-8M, or one of each
Assembling the Astral RX Shelf
1. Fitting the rack ears. Each rack ear has multiple holes to allow the depth of the shelf to be adjusted. Position the rack ear on the side of
the shelf, then select which three holes to use for the preferred depth, making sure to align them with the screw holes in the shelf’s side
panels. Fix in place using three rack ear screws.
Astral ARX8 User Guide Accessories
63
2. Mounting an Astral ARX8 to the shelf. Turn the shelf upside down then align the Astral ARX8 front panel with the front edge of the shelf.
The holes in the shelf tray allow the Astral ARX8 to be positioned to the left, center, or right of the shelf.
22.6 Astral 2.4G Ant+Mount
These easy-to-install adjustable antenna brackets are perfect for when the Astral ARX8 is used in a bag and allow the 2.4 GHz antenna to be
mounted on either side panel towards the front of the Astral ARX8, extending the 2.4GHz antenna out of the top of the bag for better NexLink range.
The Astral 2.4G Ant+Mount Kit comes with the following parts:
● 1x 2.4 GHz Antenna (SMA-M)
● 1x 18 in/45 cm SMA-M to SMA-M Cable (RG58)
● 1x adjustable bracket with SMA-F coupler and mounting hardware
● 1x 1.5 mm Allen key
● 1x 2.0 mm Allen key
● 1x 3/32” Allen key
Mounting the Antenna Brackets
1. Remove the bracket screw hole protective covers: Using the 1.5 mm Allen key to unscrew the two protective covers from each Astral
ARX8 side panel. Put the protective covers in a safe place should you need to reinstall them at a future time.
2. Installing the adjustable antenna brackets:
a. Position the adjustable bracket assembly (with fitted SMA to SMA cable) on the Astral ARX8 side panel such that the ¼” screw
aligns with the screw hole near the front of the Astral ARX8.
b. Use the 3/32” mm Allen key to screw in the ¼” bracket screw so that it loosely holds the bracket in place.
c. Adjust the lateral position and angle of the bracket to your preference, then tighten the bracket screw.
d. Adjust the position of the cable clamp so that it aligns with the side panel screw hole near the rear of the Astral ARX8.
e. Use the 2 mm Allen key to tighten the cable clamp.
f. Connect the SMA cable to the nearest rear panel 2.4 GHz SMA port.
g. Repeat above procedure for the other side’s antenna bracket.
Astral ARX8 User Guide Restricted Frequency Authorizations
64
Chapter 23: Restricted Frequency Authorizations
The wireless system operator needs to be aware of local regulations and comply with all applicable laws regarding operation of wireless devices.
Frequency Authorizations allow the unlocking of restricted frequencies that require proof of a valid license before they can be used. Once a license
has been granted, please contact Sound Devices (RF_Request@SoundDevices.com) to obtain the necessary authorization. An Authorization ID
and License Code will be generated by Sound Devices based on the license provided. The Authorization ID or License Code can be entered into the
Astral Remote App and then synchronized with an Astral ARX8, Astral-RX16, or Astral-RX32 receiver and its paired Astral transmitters.
Synchronized Frequency Authorizations can be viewed on the Astral ARX8 and paired Astral TX and Astral HH transmitters. See System Menu >
Frequency Authorization for more info.
An example of a frequency band requiring an unlock code in the United States is 1435-1525 MHz. Program Making and Special Events (PMSE)
wireless operators typically call 1435-1525 MHz the "AFTRCC band". AFTRCC stands for Aerospace and Flight Test Band Coordinating Council.
This organization coordinates several frequency bands for use by air and spacecraft in the United States. This includes 1435-1525 MHz.
Per the United States Federal Communications Commission (FCC) rules, wireless microphones are allowed as secondary users in the 1435-1525
MHz AFTRCC band. This is detailed in the FCC Part 74 rules:
https://www.ecfr.gov/current/title-47/chapter-I/subchapter-C/part-74
One section of the Part 74 rules that's of particular interest to operators seeking an AFTRCC band license is 74.803(d):
https://www.ecfr.gov/current/title-47/chapter-I/subchapter-C/part-74#p-74.803(d)
Generally speaking, a wireless operator needs to show they've used all other available spectrum before the AFTRCC will consider a license request
in the 1435-1525 MHz range. If granted, the license is normally assigned for a specific location and a specific time range.
Sound Devices encourages all wireless operators to obtain a Part 74 license, and specifically to make sure applicable parts of the 600 MHz and 950
MHz range are included with their license application. This can help show an operator is aware of the available spectrum and is utilizing it
responsibly.
More information on Part 74 licensing can be found here: https://www.local695.com/fcc-licensing/
Astral ARX8 User Guide Connector Pin Assignments
65
Chapter 24: Connector Pin Assignments
Connector
Pin Assignments
Notes
DB-25
(D-Sub)
(Ch 1-8 Analog Out)
8 analog output channels
when two 2-ch expansion
licenses are installed
1–Output 8 signal (+)
2–Output 8 Ground
3–Output 7 signal (-)
4–Output 6 signal (+)
5–Output 6 Ground
6–Output 5 signal (-)
7–Output 4 signal (+)
8–Output 4 Ground
9–Output 3 signal (-)
10–Output 2 signal (+) 11–
Output 2 Ground
12–Output 1 signal (-) 13–
unused
14–Output 8 signal (-) 15–
Output 7 signal (+) 16–Output 7
Ground
17–Output 6 signal (-) 18–
Output 5 signal (+) 19–Output 5
Ground
20–Output 4 signal (-) 21–
Output 3 signal (+) 22–Output 3
Ground
23–Output 2 signal (-) 24–
Output 1 signal (+) 25–Output 1
Ground
Mates with DB-25 Male Connectors
Wired per the AES59 standard
DB-25
(D-Sub)
(Ch 1-8 AES Out)
4 digital output signals (8
AES output channels)
when two 2-ch expansion
licenses are installed.
1–Digital Out 4 signal (+) 2–
Digital Out 4 Ground 3–Digital
Out 3 signal (-) 4–Digital Out 2
signal (+) 5–Digital Out 2
Ground 6–Digital Out 1 signal
(-) 7–Unused
8–Unused
9–Unused
10–Unused
11–Unused
12–Unused
13–Unused
14–Digital Out 4 signal (-) 15–
Digital Out 3 signal (+) 16–
Digital Out 3 Ground 17–Digital
Out 2 signal (-) 18–Digital Out
1 signal (+) 19–Digital Out 1
Ground 20–Unused
21–Unused
22–Unused
23–Unused
24–Unused
25–Unused
Mates with DB-25 Male Connectors
Wired per the AES59 standard.
Digital Out 1 = Ch 1,2
Digital Out 2 = Ch 3,4
Digital Out 3 = Ch 5,6
Digital Out 4 = Ch 7,8
BNC
(LTC/WCK) input
Center pin - signal
Sleeve - ground
Unbalanced
75-ohm connector recommended
BNC
(Front/Rear Antenna)
Center pin - signal
Sleeve - ground
50-ohm connector recommended
Astral ARX8 User Guide Connector Pin Assignments
66
SMA
(2.4 GHz, Rear NexLink)
Center pin - signal
Sleeve - ground
SMA-F ports for connecting 2.4 GHz
SMA-M antennas for NexLink.
TA4
(DC In)
Pin 1 = ground
Pin 2 =
Pin 3 =
Pin 4 = positive volts
10-18V
4-pin Hirose
(DC Out 1 & 2)
Pin 1 = ground
Pin 4 = positive volts
10-18V, 500 mA max between both
outputs (i.e., 250 mA + 250 mA)
USB-A
Per USB-IF standard
5V, 500mA
Astral ARX8 User Guide Specifications
67
Chapter 25: Specifications
Specifications are subject to change without prior notice. For the latest information available on all Sound Devices products, visit our website:
www.sounddevices.com
25.1 Astral ARX8 Specifications
Patents: The Astral ARX8 is protected by US patents US10678294B2, US20190166523A1, International patent WO2018022209A1, and several
patents pending.
RF
Tuning
● 169 to 1525 MHz (1356 MHz switching bandwidth)
● 25 kHz steps
● SpectraBand Technology for maximum rejection of out-of-band signals
● Available frequencies depend on country of operation
Modulation
● Proprietary, 100% digital RF modulation
● Standard, Long Range, or T&M, selectable per channel
Spurious Rejection
● >100 dB typical
Cascade output
● 50 ohm
● 3.5 dB Insertion Loss from front BNC through rear BNC: It is recommended to use an external powered antenna to overcome
the 3 dB splitting loss in the Astral ARX8 so that the receivers maintain excellent range.
● Wideband power split, pre-LNA
RF Bias output
● 12V, 200 mA each BNC
● Smart antenna support, Wisycom-compatible
Audio
Latency
● Standard modulation = 2 ms, analog or digital outputs
● Long Range modulation = 3.9 ms, analog or digital outputs
● T&M (Test and Measurement) = 7 ms, analog or digital outputs
Audio Frequency Response
● 10 Hz–20 kHz, +/- 1 dB relative to 1 kHz
Dynamic Range
● > 130 dB with an Astral transmitter
Output Level
● Line-level: +20 dBu for 0 dBFS
● Mic-level: -20 dBu for 0 dBFS
Tone Generator
● 1 kHz tone, adjustable from -20 to 0 dBFS
Audio Output Sample Rate
● 44.1, 48, or 96 kHz
Digital Audio Output
● AES3 balanced connection, 110-ohm output impedance
Astral ARX8 User Guide Specifications
68
Sync
● LTC / Wordclock BNC input, software-switchable 75-ohm termination
● 8-Series (when docked)
Powering
Sources
● DC Input on locking TA4 connector, pin-4 = (+), pin-1 = (-):
● 8-Series (through unit-to-unit connector when docked)
● AC mains adapter (XL-WPTA4 sold separately)
Levels
● DC input, 10 to 18V in, 2A minimum at 10 VDC
● 10W idle, default configuration
● Extra power passed through for USB power, active antenna power, and DC output power
● USB-A: 5V, 500 mA output; supports keyboards, thumb drives, Astral transmitters, and USB hubs
● DC Outs: max 500 mA between both outputs.
Environmental
Operating Temperature Range
● -10 °C to +55 °C
Dimensions (H x W x D)
● 4.0 cm x 20.3 cm x 16.7 cm
● (1.6 in x 8.0 in x 6.6 in)
Weight
● 1.22 kg (unpackaged)
● 2.7 lbs. (unpackaged)
Astral ARX8 User Guide Specifications
69
27.1.1 Astral ARX8 Threaded Holes
Astral ARX8 User Guide Specifications
70
25.2 Monarch Specifications
Frequency range
● 470 MHz - 1600 MHz
Gain
● 2.2 dBi
Pattern
● Omnidirectional
Return Loss
● Better than 15 dB across entire 470 - 1600 MHz range
Mounting Threads
● ¼”-20
Dimensions (H x W x D)
● 17.0 cm x 21.0 cm x 1.7 cm
● (6.68 in x 8.26 in 0.67 in)
Weight
● 0.12 kg (unpackaged)
● 0.26 lbs. (unpackaged)
Astral ARX8 User Guide Note on RF Interference
71
Chapter 26: Note on RF Interference
Sound Devices does not guarantee the absence of any interfering spurs across all bands in all situations. Some small spurs can originate within the
Astral ARX8, and others can come from many sources (AES/EBU interconnects, external mixer-recorders, USB drives, USB keyboards, etc.). This,
combined with the extreme sensitivity of the Astral ARX8's front end, mean that the user has to be very careful with the quality of cables used, as
well as antenna and antenna cable routing and placement.
We highly recommend placing antennas as far as possible from other pieces of equipment, especially antennas from intentional transmitters, such
as IFB units.
Chapter 27: Servicing the Astral ARX8
Do not attempt to service the Astral ARX8. The internal parts are microscopic and not user serviceable. Please send to Sound Devices for any
service needs. https://service.sounddevices.com/contact-support/
Chapter 28: Warranty
Sound Devices, LLC warrants the items listed above against defects in materials and workmanship for a period of ONE (1) year from date of original
retail purchase. Users who register their product directly with Sound Devices Technical Support using the online form or by phone, will receive an
additional ONE (1) year of warranty coverage, extending the complete warranty period to TWO (2) years from the date of original retail purchase. To
extend the warranty coverage period, registration must be completed within the initial ONE (1) year warranty period. Products must be purchased
through authorized Sound Devices resellers to qualify for Warranty coverage. Damage resulting from the opening of a Sound Devices product or
attempted repairs by a non-authorized Sound Devices repair technician will void warranty coverage.
This is a non-transferable warranty that extends only to the original purchaser. Sound Devices, LLC will repair or replace the product at its discretion
at no charge. Warranty claims due to severe service conditions will be addressed on an individual basis.
THE WARRANTY AND REMEDIES SET FORTH ABOVE ARE EXCLUSIVE. SOUND DEVICES, LLC DISCLAIMS ALL OTHER WARRANTIES,
EXPRESS OR IMPLIED, INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. SOUND
DEVICES, LLC IS NOT RESPONSIBLE FOR SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING FROM ANY BREACH OF
WARRANTY OR UNDER ANY OTHER LEGAL THEORY. Because some jurisdictions do not permit the exclusion or limitations set forth above, they
may not apply in all cases.
For all service, including warranty repair, please contact Sound Devices for an RMA (return merchandise authorization) before sending your unit in
for repair. Products returned without an RMA number may experience delays in repair. When sending a unit for repair, please do not include
accessories, including SSD drives, CF cards, batteries, power supplies, carry cases, cables, or adapters unless instructed by Sound Devices. Sound
Devices repairs and replacements may be completed using refurbished, returned or used parts that have been factory certified as functionally
equivalent to new parts.
Sound Devices, LLC
Services Repair RMA #XXXXX
E7556 State Road 23 and 33
Reedsburg, WI 53959 USA
Telephone: +1-608-524-0625
Astral ARX8 User Guide Legal Notices
72
Chapter 29: Legal Notices
Product specifications and features are subject to change without prior notification. Read and fully understand this manual before operation.
Copyright© 2022 Sound Devices, LLC. All rights reserved. This product is subject to the terms and conditions of a software license agreement
provided with the product and may be used in accordance with the license agreement. This document is protected under copyright law. An
authorized licensee of this product may reproduce this publication for the licensee’s own personal use. This document may not be reproduced or
distributed, in whole or in part, for commercial purposes, such as selling copies or providing educational services or support. This document is
supplied as a technical guide. Special care has been taken in preparing the information for publication; however, since product specifications are
subject to change, this document might contain omissions and technical or typographical inaccuracies. Sound Devices, LLC does not accept
responsibility for any losses due to the use of this guide.
LIMITATION ON SOUND DEVICES’ LIABILITY. TO THE FULLEST EXTENT PERMITTED BY LAW, SOUND DEVICES SHALL HAVE NO
LIABILITY TO THE END USER OR ANY OTHER PERSON FOR COSTS, EXPENSES, DIRECT DAMAGES, INCIDENTAL DAMAGES, PUNITIVE
DAMAGES, SPECIAL DAMAGES, CONSEQUENTIAL DAMAGES OR OTHER DAMAGES OF ANY KIND OR NATURE WHATSOEVER ARISING
OUT OF OR RELATING TO THE PRODUCTS, THESE TERMS AND CONDITIONS OR THE PARTIES’ RELATIONSHIP, INCLUDING, WITHOUT
LIMITATION, DAMAGES RESULTING FROM OR RELATED TO THE DELETION OR OTHER LOSS OF AUDIO RECORDINGS OR DATA,
REDUCED OR DIMINISHED AUDIO QUALITY OR OTHER SIMILAR AUDIO DEFECTS ARISING FROM, RELATED TO OR OTHERWISE
ATTRIBUTABLE TO THE PRODUCTS OR THE END USER’S USE OR OPERATION THEREOF, REGARDLESS OF WHETHER SUCH
DAMAGES ARE CLAIMED UNDER CONTRACT, TORT OR ANY OTHER THEORY. “CONSEQUENTIAL DAMAGES” FOR WHICH SOUND
DEVICES SHALL NOT BE LIABLE SHALL INCLUDE, WITHOUT LIMITATION, LOST PROFITS, PENALTIES, DELAY DAMAGES, LIQUIDATED
DAMAGES AND OTHER DAMAGES AND LIABILITIES WHICH END USER SHALL BE OBLIGATED TO PAY OR WHICH END USER OR ANY
OTHER PARTY MAY INCUR RELATED TO OR ARISING OUT OF ITS CONTRACTS WITH ITS CUSTOMERS OR OTHER THIRD PARTIES.
NOTWITHSTANDING AND WITHOUT LIMITING THE FOREGOING, IN NO EVENT SHALL SOUND DEVICES BE LIABLE FOR ANY AMOUNT OF
DAMAGES IN EXCESS OF AMOUNTS PAID BY THE END USER FOR THE PRODUCTS AS TO WHICH ANY LIABILITY HAS BEEN
DETERMINED TO EXIST. SOUND DEVICES AND END USER EXPRESSLY AGREE THAT THE PRICE FOR THE PRODUCTS WAS
DETERMINED IN CONSIDERATION OF THE LIMITATION ON LIABILITY AND DAMAGES SET FORTH HEREIN AND SUCH LIMITATION HAS
BEEN SPECIFICALLY BARGAINED FOR AND CONSTITUTES AN AGREED ALLOCATION OF RISK WHICH SHALL SURVIVE THE
DETERMINATION OF ANY COURT OF COMPETENT JURISDICTION THAT ANY REMEDY HEREIN FAILS OF ITS ESSENTIAL PURPOSE.
The “wave” logo is a registered trademark of Sound Devices, LLC. Windows is a registered trademark of Microsoft Corporation in the U.S. and other
countries. Bluetooth LE is a registered trademark of Bluetooth SIG, Inc. Android is a registered trademark of Google. iPad, iPhone, and iOS are
registered trademarks of Apple Inc. All other trademarks herein are the property of their respective owners.
Astral ARX8 User Guide Legal Notices
73
FCC Conformity
NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These
limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and
can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio
communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful
interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct
the interference by one or more of the following measures:
—Reorient or relocate the receiving antenna.
—Increase the separation between the equipment and receiver.
—Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
—Consult the dealer or an experienced radio/TV technician for help.
This device complies with FCC RF exposure limits for general population / uncontrolled environments. A separation distance of at least 20 cm must
be maintained between the antenna and all persons. This device must not be co-located with any other antenna or transmitter. This device has been
approved to operate with the antenna type listed below:
Model: W1010 Type: Wireless External Antenna for 2.4 GHz Application
Manufacturer: PulseLarson Max. Gain: 2.0dBi
No change to the antenna type is permitted. Any change to the antenna could result in the device exceeding the RF exposure requirements and void
the user’s authority to operate the device.
Changes or modifications not expressly approved by the manufacturer could void the user’s authority to operate the equipment.
To comply with FCC part 15 rules in the United States, the Astral ARX8 receiver must be professionally installed.
It is the responsibility of the operator and professional installer to ensure that only certified antennas are to be used in the United States.
Astral ARX8 User Guide Legal Notices
74
Industry Canada Conformity
This device complies with ISED RF exposure limits for general population / uncontrolled environments. A separation distance of at least 20 cm must
be maintained between the antenna and all persons. This device must not be co-located with any other antenna or transmitter. This device has been
approved to operate with the antenna type listed below:
Model: W1010 Type: Wireless External Antenna for 2.4 GHz Application
Manufacturer: PulseLarson Max. Gain: 2.0dBi
No change to the antenna type is permitted. Any change to the antenna could result in the device exceeding the RF exposure requirements and void
the user’s authority to operate the device.
This Device complies with Industry Canada License-exempt RSS standard(s). Operation is subject to the following two conditions: 1) this device may
not cause interference, and 2) this device must accept any interference, including interference that may cause undesired operation of the device.
Cet appareil se conforme aux normes ISED sur les limites d'exposition aux radiofréquences pour la population générale et environnements non
controllés. Une distance minimale d'au moins 20cm doit être maintenue entre l'antenne et toute personne. Cet appareil ne doit pas être co-localisé
avec toute autre antenne ou transmetteur. Cet appareil a été aprouvé pour fonctionner avec le type d'antenne ci-dessous:
Model: W1010 Type: Antenne externe sans fil pour application à 2.4 GHz
Manufacturer: PulseLarson Gain Max: 2.0 dBi
Aucun changement de type d'antenne n'est permis. Tout changement sur l'antenne pourrait causer l'appareil à excéder les limites d'exposition RF et
annuler le droit de l'usager à faire fonctionner cet appareil.
Cet appareil est conforme avec Industrie Canada, exempts de licence standard RSS (s). Son fonctionnement est soumis aux deux conditions
suivantes: 1) ce dispositif ne peut pas causer d’interférences, et 2) ce dispositif doit accepter toute interférence, y compris les interférences qui
peuvent causer un mauvais fonctionnement de l’appareil.
WEEE Statement
If you wish to discard a Sound Devices product in Europe, contact Sound Devices (England) for further information.
Astral ARX8 User Guide Declaration of Conformity
75
Chapter 30: Declaration of Conformity
Manufacturer’s Name: Sound Devices, LLC
Manufacturer’s Address: E7556 State Road 23 and 33 Reedsburg, WI 53959 USA
We, Sound Devices LLC, declare under our sole responsibility that the product
Product Name: Astral ARX8
Model Number: Astral ARX8
Description: Digital Wireless Receiver
is in conformity with the essential requirements of the following relevant Union harmonization legislation:
Radio Equipment Directive (RED) 2014/53/EU
Low Voltage Directive 2014/35/EU
RoHS Directive 2011/65/EU
The following harmonized standards and/or normative documents were applied:
Health & Safety (Article 3.1(a) of RED) EN 62368-1:2014
EN 50566:2017
EMC (Article 3.1(b) of RED) EN 301-489-1 v2.2.3:2019
EN 301-489-9 v2.1.1:2019
EN 301-489-17 v3.2.4:2020
RF Spectrum (Article 3.2 of RED) EN 300 422-1 v2.1.2:2017
EN 300 328 v2.2.2:2019
EN 300 440 v2.1.1:2017
Signed for and on behalf of Sound Devices LLC:
July 21st, 2023
__________________________________ ______________________________________
Date Matt Anderson - Sound Devices, LLC President
Post Office Box 576
E7556 State Rd. 23 and 33
Reedsburg, Wisconsin 53959 USA
support@sounddevices.com
+1608.524.0625 main
800.505.0625 toll free (U.S. only)
www.sounddevices.com