Astral ARX2
(Previously known as A20-RX)
Two-Channel, True Diversity Receiver
with SpectraBand Technology
User Guide v8.30
Astral ARX2 User Guide
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Table of Contents
Welcome to the Astral ARX2 3
SpectraBand 4
Panel Views 5
Top Panel 5
Bottom Panel 6
Basics of Navigating Astral ARX2 7
Power 7
Main Display 9
Astral Transmitters - GainForward Input Menu 12
Selection Menus 13
Main Menu 13
Outputs Sub-menu 14
Settings Sub-menu 15
Display Sub-menu 16
System Sub-menu 17
Tuning the Astral ARX2 18
Country 18
Modulation 18
Bands 18
Frequency 19
Frequency Scanning 20
Frequency AutoAssign 21
Frequency Band Restrictions 22
Audio Output and Control 23
SuperSlot 23
User Groups 23
Firmware Update 26
Accessories and Adapters 28
Connector Pin Assignments 30
Astral ARX2-SL/DB-25 Connector Pin Assignments 30
Astral ARX2-XLR/A-XLR Connector Pin Assignments 31
Astral ARX2-TA3/A-TA3 Connector Pin Assignments 32
Astral ARX2 Specifications 33
Antenna Guide 34
Servicing the Astral ARX2 35
Warranty 35
Legal Notices 35
Declaration of Conformity 37
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Welcome to the Astral ARX2
Experience ultimate flexibility as you find available spectrum away from the crowded UHF TV band. The Astral ARX2 two channel
true diversity receiver features SpectraBand technology, which delivers a tuning range of 169 – 1525 MHz in a single unit – an
industry first. Superior low-loss, brick-wall SAW filters deliver excellent performance in noisy RF environments, while the AutoAssign
feature makes frequency selection and setting quick and easy.
● 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.
● Advanced Digital True Diversity topology uses two complete RF receivers for each of the two channels, with four RF
receivers in total.
● State-of-the-art 100% digital long-range modulation delivers the longest transmission distance of any digital system on the
market.
● GainForward Architecture compatible with Astral transmitters. Set the transmitter’s gain levels via trim control (with an 8-
Series) or at the Astral ARX2 (for other mixers).
● Full 10 Hz – 20 kHz audio bandwidth; 100% digital RF modulation and transmission.
● SuperSlot compatible with the SL-2 and 8-Series mixer-recorders.
● Excellent immunity from nearby IFB or camera hop transmitters without the need for external filters or extra cabling.
● Maximum connectivity: SuperSlot, XLR, and TA3 backplates, A-RXMON headphone amp, and A-15PIN two-channel AES
Sony camera slot adapter.
● Analog line-level or AES digital audio output.
Our friendly and knowledgeable support team, based in the USA and the UK, is here for all your questions and comments. Our job
is to make your job easier.
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SpectraBand
The Astral ARX2 introduces SpectraBand, a technology that enables the Astral ARX2 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 (169-215 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 (173-209 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.
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Panel Views
Top Panel
1 & 10: Antenna Connector A & B
SMA connectors, connects to included 1/4-wave whip antenna.
2 & 9: Channel 1 & 2 Power LED
● Illuminates blue when the channel’s receiver circuitry is powered and operational.
● Blue LED flashes when the paired transmitter’s battery is critically low or depleted.
3 & 8: Channel 1 & 2 Green/Red RF Status LEDs
● Indicates signal strength of received RF
● Channel’s green LED illuminates solid green with good RF reception. It starts to flicker green as the received RF signal
quality deteriorates.
● Channel’s red LED illuminates solid red when the receiver channel loses lock to the transmitter signal due to weak signal
or transmitter being turned off.
● Channel’s green and red LEDs are off at the fringe of reception.
● Solid green LED and flashing red LED on both channels 1 & 2 when RF signal is approaching overload on either channel.
● Channel’s red LED flashes when RF overload is occurring.
4: Left Button
Moves the menu selection to the left, or decrements values.
5: Center Button
Enters the menu selection. Also used to select options in the menu.
6: Right Button
Moves the menu selection to the right, or increments values.
7: Display
The screen can be set to turn off after a period of inactivity from the Selection menu (Main
>Settings>Display>Screensaver).
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Bottom Panel
1: Screw Holes
Used to secure various backplate accessories to the Astral ARX2.
2: Multi-Pin Accessory Connector
Allows connection to various accessories and adapters, including the A-SL, A-XLR, or A-TA3, See Accessories and Adapters for
details.
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Basics of Navigating Astral ARX2
Navigating the Astral ARX2 is simple and quick using the display and buttons on the top panel.
This section is aimed to provide you with the basics of navigating the Astral ARX2 interface. Various screens and menus are
described in detail throughout this User Guide.
The Astral ARX2 displays the Dual Channel screen when powered on. Channel 1 status is displayed on the left and Channel 2 on
the right. Press the Left button to navigate through Channel 1 related screens. Press the Right button to navigate Channel 2 related
screens.
The directional buttons toggle through the Dual Channel screen, Single Channel screen, GainForward Input menu (under certain
conditions), and the Transmitter Information screens. Press the opposite direction to return to the previously displayed screen.
Press the Center button to access the Selection Menu for the channel displayed. The Channel 1 Selection Menu is always accessed
from the Dual Channel screen.
The Selection Menu contains channel specific settings and global Astral ARX2 settings. The Selection Menu displays the channel
number in the top left hand corner.
In the Selection Menu use the Left and Right button to move through the menus and options. Press the Center button to make a
selection. Select the back arrow to return to the previous screen.
Power
The Astral ARX2 is powered when DC power is present. There are no additional power switches.
A-SL
With the A-SL attached, the Astral ARX2 receives power via the D-sub. Power is provided by the host device, such as the 8-Series
and SL-2, the A10-RACK, or other third-party device.
A-TA3
With the A-TA3 attached, the Astral ARX2 receives power from the 4-pin Hirose female connector or TA-4 connector.
A-XLR
With the A-XLR attached, the Astral ARX2 receives power from the 4-pin Hirose female connector. The 4-pin male Hirose connector
is a power loop through.
A-RXMON
With the A-RXMON attached, the Astral ARX2 receives power from its attached Sony L-Mount style battery.
A-15PIN
With the A-15PIN attached, the Astral ARX2 receives power via the 15-pin connector from the Sony camera.
Channel Power
Each of the two channels of the Astral ARX2 can be powered on or off individually. When a channel is powered down that portion of
the Astral ARX2 no longer draws power. When using Astral ARX2 for a single wireless channel, best practice is to power down the
unused channel.
Channel Power LEDs
The Astral ARX2 has blue Channel Power LEDs for each of its two channels. When first powering the Astral ARX2 without
transmitters present, the LEDs illuminate indicating the receiver channel is powered.
The receiver channel can receive an A10-TX or Astral transmitter that is powered on and set to the receiver frequency. The Channel
Power LED then shows the battery status of its associated transmitter.
● Solid blue indicates the transmitter battery is in good condition.
● Flashing blue indicates the transmitter battery level is low or depleted.
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When a received transmitter is powered down, the blue LED continues to show the last condition of the transmitter battery. If the
transmitter is powered back on, or a new transmitter is activated on the channel, that transmitter pairs with the receiver and its
transmitter battery condition is shown with the blue LED.
Note: The LEDs change assignment based on the orientation of the display. Channel 1 is always shown left of the display and
channel 2 is always on the right.
Powering a channel on or off
1. Press the Center button to enter the Selection Menu.
2. Navigate to Menu>System>Power.
3. Select the channels you want powered on.
a. 1 - Channel 1 is powered on, Channel 2 is off.
b. 1+2 - Both channels are powered on.
c. 2 - Channel 1 is off, Channel 2 is off.
d. Off - Both channels are powered off. The Astral ARX2 enters Standby mode.
4. 4. Channels that are turned off appear as ‘Ch Off’ in the single and dual channel screens.
Using shortcuts to power channels on or off:
● To quickly power channel 1 on and off, press and hold the Left and Center button for two seconds.
● To quickly power channel 2 on and off, press and hold the Right and Center button for two seconds.
Standby Mode
The Astral ARX2 enters Standby mode when the receiver is powered and both channels are powered off.
Pressing any button displays the following.
Power on any channel to exit Standby mode using the power channel shortcut described above.
To power on both channels from Standby mode:
1. Press and hold the Center button for two seconds.
2. Release the Center button when the Channel Power LEDs turn blue.
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Main Display
When the receiver is first powered on, the main display shows the Dual Channel view.
Dual Channel View
The display shows channel 1 and channel 2 simultaneously. Parameters displayed include the RF signal strength at each antenna,
Q-meter, receiver frequency, audio level, and transmitter battery level.
1: Channel 1 Status
Displays Channel 1 RSSI, Q-meter, audio level, frequency, and transmitter information.
2: Channel 2 Status
Displays Channel 2 RSSI, Q-meter, audio level, frequency, and transmitter information.
3: TX Battery Status
Battery icons indicate status of transmitters’ batteries.
4: Audio Level
Each channel shows a horizontal meter for audio levels. For larger audio meter display, set Menu>Settings>Display>Q-meter to
small.
5: Transmitter Limiter/Overload/Mute
Displays the Limiter, Overload, or Mute status of the tuned transmitter. L = Limiter, ! = Overload, M = Mute.
6: Transmitter Record Status
The Record indicator is displayed when the tuned transmitter is recording.
7: Frequency
Displays the receiver channel frequency.
Region (X, Y, Z), TV Channel, and sub channel are displayed when the Display Options menu is set to TV Ch.
8: Q-meter
The Q-meter displays the difference between the signal from the transmitter and any interference using five circles. When a
frequency without little to no interference is selected, the Q-meter will display five bars.
9: RSSI Meter
Receive Strength Signal Indicators (RSSI) are displayed on the screen. The bars indicate RF signal strength at each antenna for the
selected frequency.
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Note: Even with the transmitter turned off or out of range, bars may still be displayed. This is due to the presence of background RF
signal at the selected frequency.
An asterisk next to the sub channel indicates that the set frequency is not directly on a preassigned sub channel.
The User Name is displayed when User Groups are active. See User Groups.
Single Channel View
Pressing the Left or Right buttons when in dual channel view changes the display to a single- channel view of channel 1 or 2,
respectively.
In addition to the parameters shown in two-channel view, the single channel screens display the transmitter name and the analog
output level or AES.
When the channel is receiving an A10-TX, pressing the Left or Right button again shows the A10-TX Information screen.
When the channel is receiving an A10-TX, pressing the Left or Right button again shows the A10-TX Information screen.
When the channel is receiving an Astral transmitter, pressing the Left or Right button enters the Astral ARX2 Input menu. The Input
Menu is not available when the Astral ARX2 is connected to the 833, 888, or Scorpio via the SL-2 or SL-6. With this setup the Astral
transmitter Information screen is displayed. See GainForward Input Menu for more details.
Mute Function on the Transmitter
When the A10-TX or Astral transmitter audio is muted from the transmitter, the Astral ARX2 displays ‘M’ in the dual channel screen
and ‘Mute’ in the single channel screen.
RF Signal Indicator LEDs
The RF Signal LEDs offer an at-a-glance indication of RF performance. The LEDs to the left of the display indicate channel 1
activity, while the LEDs to the right indicate channel 2 activity. Each channel has one green LED and one red LED.
● Indicates signal strength of received RF
● Channel’s green LED illuminates solid green with good RF reception. It starts to flicker green as the received RF signal
quality deteriorates.
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● Channel’s red LED illuminates solid red when the receiver channel loses lock to the transmitter signal due to weak signal
or transmitter being turned off.
● Channel’s green and red LEDs are off at the fringe of reception.
● Solid green LED and flashing red LED on both channels 1 & 2 when RF signal is approaching overload on either channel.
● Channel’s red LED flashes when RF overload is occurring on that channel.
The LEDs change assignment based on the orientation of the display set in Menu > Settings > Display > Orientation.
Channel 1 is always shown left of the display and channel 2 is always on the right.
The LEDs can be turned off in Menu > Settings > LEDs.
RF Overload Indication
When an RF signal is approaching overload on either channel, the Astral ARX2’s green LED is solid and its red LED flashes on both
channels 1 and 2. When the RF input is overloading on a channel, only the red LED flashes for that channel. This is an indication
that the quality of the signal is degrading. Correct an overload condition by:
● Reducing RF power on the transmitter
● Changing the tuning band and frequency such that the the interfering RF signal is out of band.
● Increasing the distance between transmitter and receiver
● Applying attenuation to the antenna system in use.
Display Orientation
The Astral ARX2 Menu screen operates with its Menu buttons either below or above the display. This is controlled in
Menu > Settings > Display > Orientation. Normal is the default orientation with the buttons positioned below the display
.
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Astral Transmitters - GainForward Input Menu
The Astral ARX2 supports the Astral transmitters’ GainForward feature. GainForward eliminates the need to adjust microphone
preamplifier gain at the wireless transmitter. Audio levels from the transmitter are controlled either directly at the mixer’s trim control
or at the wireless receiver. 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. Read more about GainForward at: https://www.sounddevices.com/gainforward-
explained/
From the Astral ARX2 home screen, press the channel’s directional button twice to enter the Input menu. From the Input menu,
press the middle button to select a sub-menu to adjust gain, low cut, or limiter of the incoming Astral transmitter signal.
When the Astral ARX2 receiving Astral transmitter signal is slotted into the SL-2 or SL-6 (using the A-SL adapter), the Astral ARX2
Input menu settings are bypassed and hidden. All gain, low cut, and limiter activity are performed and controlled by the 833, 888, or
Scorpio. See the Mixer-Recorder User Guides for more information.
The A10-TX does not support GainForward. The Input menu is not available on channels paired with an A10-TX.
Icon
Description
Exit
Returns to the single-channel view.
Gain
Sets the gain of the incoming Astral transmitter signal.
● 0 to 60 dB
Low Cut
Sets the Low Cut Filter freq for the received Astral transmitter signal. Low cut is 3rd order, 18dB/oct roll off.
● Off
● 40 Hz
● 60 Hz
● 80 Hz
● 100 Hz
● 200 Hz
Limiter
Sets the Limiter for the received Astral transmitter signal. Attack: 1 ms, Threshold: -6 dBFS, Release: 100 mS,
Ratio: 20:1
● On
● Off
Information
Displays the Astral transmitter’s name and the Astral ARX2’s Input Gain and Low Cut values.
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Selection Menus
The Astral ARX2 receiver is controlled through its main Selection menu. Enter the menu by first selecting either the channel 1
receiver (Left button) or channel 2 receiver (Right button), then press the Center button. Once in the menu, the Left and Right
buttons toggle among options, and the Center button makes the selection.
Main Menu
Icon
Description
Exit
Returns to the main display view.
Frequency
Provides access to the Frequency menu. Set the Band, Tune frequencies, and set frequency by TV Channel and
Sub Channel. Available Bands and Frequencies are dependent on the Country setting.
● Tune: Tunable from 169-1525 MHz in 25 kHz steps. Available frequencies depend on Country and Band
settings.
● TV Channel and Sub-Channel are displayed and can be used to set Frequency when operating in the
UHF Band (470-694 MHz). An asterisk next to the sub channel indicates that the set frequency is not
directly on a preassigned sub channel.
● Band sets the frequency range of operation and RF filters to ensure best RF performance.
Outputs
Enters the Outputs sub-menu.
● Maximum Level
● Audio Polarity
● Mode
● Test Tone
Scan
Enters the Scan menu. Scanner displays RF activity. Perform a scan on any available Band in the 470-1525 MHz
range, the VHF Band, the entire UHF Band (470-694 MHz), UHF1 (470-578 MHz), UHF2 (578-694 MHz), or User
Groups frequencies (when activated). The RF scan plot is displayed while a scan is in progress. AutoAssign
automatically selects the clearest frequencies based on the RF Scan results of the current Band selection.
Privacy
Privacy is available on the A10-TX, Astral transmitters, and the Astral ARX2. When enabled, the transmitted RF
signal is encrypted. In order to be received a four-digit code must be entered.
● On - Astral ARX2 decodes the received encrypted RF signal. Enter the four-digit key. Use the Left and
Right buttons to adjust the numeric value. Press the Center button to set the value and advance to the
next digit.
● Off - the received RF signal is not decoded. When Privacy is off, the four digit key is displayed as 0000.
Settings
Enters the Settings sub-menu.
● Modulation
● User Groups
● Country
● Display
● LEDs
System
Enters the System sub-menu.
● Power
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● Restore
● Info
Outputs Sub-menu
Icon
Description
Exit
Returns to the Main menu.
Maximum Level
Selects the maximum analog output level. Output level based on a 0 dBFS signal sent from the transmitter. Setting
applies per channel. Maximum Level is not available when Astral ARX2 is mounted via A-SL to SL-2 and 8-Series.
● +14 dBu
● +2 dBu
● -10 dBu
● -22 dBu
Audio Polarity
Selects the polarity of the balanced output signal. Setting applies per channel.
Audio Polarity is not available when Astral ARX2 is mounted via A-SL to SL-2 and 8-Series.
● Normal
● Inverted
Mode
Choose the audio output type of the Astral ARX2. When the Astral ARX2 (with A-XLR or A-TA3) is set to AES the
channel 2 XLR or TA3 output connection is not used. This setting applies to both channels.
Mode is not available when Astral ARX2 is mounted via A-SL to SL-2 and 8-Series.
● Analog
● AES
Test Tone
Activates a 1 kHz tone oscillator sent directly to the outputs. The transmitter audio signal on the receiver output is
disrupted while tone is active. Tone is activated per channel.
● -18 dBFS
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Settings Sub-menu
Icon
Description
Exit
Returns to the Main menu.
Selects Standard or Long Range Modulation.
The Modulation setting must match between the transmitter and the Astral ARX2 in order for the transmitted signal
to be received.
● Std (Standard)
● LR (Long Range)
User Groups
Sets whether receiver utilizes user groups (User) or manual frequency selection (Factory). See User Groups for
more information
● User
● Factory
Country
Selects the country of operation. This determines the bands, frequencies, and TV channel mapping of preset
frequencies for your area. Use the ‘Other’ option if your location is not listed.
Display
Enters Display sub-menu.
● Brightness
● Screensaver
● Orientation
● Options
● Q-meter
LEDs
When set to On the LEDs remain illuminated. Off deactivates the LEDs.
● On
● Off
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Display Sub-menu
Icon
Description
Exit
Returns to the Main menu.
Screen Brightness
Sets the brightness of the OLED screen.
● Five increments, 1–5, 5 is brightest
Screensaver
Sets the duration, in seconds, how long the screen remains on after a button press. Off keeps the screen on
continuously with no screensaver.
● Off - display remains on when unit is powered
● 5 sec
● 30 sec
● 120 sec
Orientation
Sets the operating orientation of Astral ARX2 in relation to the buttons, screen, and LEDs. The Astral ARX2 can be
used in an orientation with the buttons below the screen (normal), or with the buttons to the top (flipped).
● Normal
● Flipped
Options
Sets whether Frequency or TV Channel is displayed on the main display.
● Frequency
● TV Ch
Q-Meter
Determines the size of the Q-meter displayed on the single and dual channel screens. The audio meter display
size is larger when Q-Meter is set to small and is reduced when Q-Meter is Large.
● Large
● Small
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System Sub-menu
Icon
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Tuning the Astral ARX2
Country
The country of operation determines the available Bands and Frequencies. The country setting also determines the TV channel
mapping of preset frequencies in the UHF band. It is important to set the country before transmitting and receiving RF. Country
should be reset anytime you change your location to another country. See Frequency Band Restrictions.
To Set Country:
1. Enter the Menu.
2. Select Settings to enter the Settings sub-menu.
3. Select Country.
4. Use the Left and Right buttons to locate the current country of operation.
5. If the country is not listed, use the ‘Other’ option.
6. Press the Center button to select the country and return to the Settings sub-menu
Modulation
Modulation can be set to Standard (Std) or Long Range (LR) per receiver channel. Set Modulation in Menu > Settings > Modulation.
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 Astral Mini, Astral TX, Astral HH, or A10-TX and the Astral ARX2 in order for the
transmitted signal to be received.
Bands
The A20 Digital Wireless System incorporates SpectraBand technology. This allows operation across a frequency range of 169 -
1525 MHz making it possible to find available frequencies wherever you are.
To Set Band:
1. Press the Center button to enter the Menu.
2. Select Frequency.
3. Select Band.
4. Use the Left and Right buttons to find the band of frequencies to operate within.
5. Press the Center button to select the Band.
6. After selecting the Band, Set is highlighted. This is to confirm the change of Band. Changing Bands interrupts audio and
changes the frequencies assigned to Rx channels
Select Set to confirm the selection or select the back arrow to cancel the Band change and return to the Frequency menu.
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Frequency
Because the A10 and Astral ARX2 digital RF transmission is inherently immune to intermodulation, multiple A10 and Astral ARX2
Digital Wireless systems can be used simultaneously on nearby adjacent frequencies without 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.
To Tune Frequency:
1. Enter the Menu.
2. Select Frequency.
3. Select Tune.
4. Use the Left and Right buttons to set the frequency in MHz to the left of the decimal point. Values increment in 1 MHz
steps. Unavailable frequencies for the country of operation are not displayed.
5. Press the Center button to select the frequency and move the selector to adjust the kHz value.
6. Use the Left and Right buttons to set the frequency in kHz to the right of the decimal point. Values increment in 25 kHz
steps. Unavailable frequencies for the country of operation are not displayed.
7. Press the Center button to select the frequency and move the selector to Set.
8. Select Set to confirm the frequency or select the back arrow to cancel the frequency change and return to the Frequency
menu.
TV Channel Frequency Presets
To simplify frequency selection in the UHF Band (470 - 694 MHz, country dependent), frequencies are divided into channels and
sub channels. The specific frequencies corresponding to channels and sub channels depends on the Country setting (Main >
Settings > Country). Countries operate in either 6, 7, or 8 MHz spacing. On the A10-RX, this was labeled X, Y, and Z respectively.
● Channel - corresponds to broadcast television channels.
● Sub Channel - channels are divided in 400 kHz increments called sub channels to speed up frequency selection.
● Frequency - specific frequencies within the receivers tuning range can be selected in 25 kHz increments. When a selected
frequency does not correspond with a TV Channel Frequency Preset, an asterisk character (*) is shown in the display
adjacent to TV channel/sub channel assignment.
TV Ch is not displayed or accessible throughout the Astral ARX2 user interface when Band falls outside of the UHF band (470-694
MHz, country dependent).
To change frequency using TV Channel Frequency Presets:
1. Press the Center button to enter the Menu.
2. Select Frequency to enter the Frequency menu. Be sure that Band set to operate within UHF (470-694 MHz, country
dependent.
3. Highlight ‘TV Ch’, then press the Center button to change the TV Channel Frequency Preset.
4. Highlight ‘TV Ch’ then press the Center button to edit the TV Channel.
5. Use Left and Right buttons to adjust the ‘TV Ch’ value then press the Center button to select the value.
6. Highlight ‘Sub Ch’ then press the Center button to edit the sub-channel.
7. Use Left and Right buttons to adjust the ‘Sub Ch’ value then press the Center button to select the value.
8. Highlight ‘Set’ then press the Center button to set the frequency to the TV Ch Frequency Preset.
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Frequency Scanning
The frequency scanning tool uses the radios in the Astral ARX2 to display RF signal level within the selected scan range. This helps
locate available frequencies. The scan tool operates over the selected bandwidth of the receiver.
Channel 1 and 2’s audio is muted while scanning.
Scan Options
The frequency range scan options vary depending on country.
● Auto - Scans the current Tuning Band and automatically assigns frequencies to the Rx Channel(s). See Frequency
AutoAssign for more information.
● Band - Scans the current Tuning Band.
● UHF - Scans the entire UHF spectrum (470-694 MHz, country dependent).
● UHF 1 - Scans the first half of the UHF band (470-578 MHz).
● UHF 2 - Scans the second half of the UHF band (578-694 MHz).
● Other Bands - Lists all Bands available in your country from lowest to highest frequencies. Scans are performed on the
frequency range displayed. Performing a scan does not change the Band of operation.
● User Scan - When user groups are in use, the User Scan option is available in the Scan menu. This options scans only
frequencies of the loaded user group. See User Groups for more information.
To perform an RF Scan:
1. Enter the menu and select Scan.
2. Select the Scan option for the frequency range you want to operate in. The scan starts automatically.
Icon
Description
>>
Run Scan
Select >> to start the RF Scan.
Scans are performed from lower frequencies to higher frequencies. The scan is complete when the cursor reaches the end of the
scan range at the far right of the screen then returns to the beginning of the scan range on the far left.
Press the Left button to stop scanning.
>
Step Forward
Select > to move the cursor forward by 200 kHz.
<
Step Back
Select > to move the cursor backwards by 200 kHz.
<<
Run Backwards Scan
Select << to start the RF Scan from the higher frequencies of the scan range to the lower frequencies. The scan is
complete when the cursor reaches the beginning of the scan range at the far left of the screen then returns to the
end of the scan range on the far right.
Press the Right button to stop scanning.
Set
Set
Select Set to assign the frequency at the cursor position to the Rx channel.
Auto
AutoAssign
Select Auto to automatically assign frequencies to Rx channels. See Frequency AutoAssign for more information.
AutoAssign is available when scanning the current Band selection.
When setting a frequency that falls outside the range of the current Band selection, the following confirmation appears:
Change Tuning Band?
● Yes - changes the band and frequency of the Rx Channel.
● No - frequency and band remains unchanged and returns to the scan results.
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Frequency AutoAssign
AutoAssign scans the current tuning band and selects available frequencies for the Astral ARX2’s two channels. This feature is
designed to make frequency selection quick and easy. There are two ways to AutoAssign frequencies:
1. AutoAssign without a prior scan.
2. AutoAssign from an existing scan.
To AutoAssign frequencies without a prior scan:
1. Enter the menu and select Scan.
2. Select Auto. AutoAssign looks for clean frequencies in the current Band.
3. Select the channel(s) you want to assign.
a. 1 - AutoAssigns a frequency to channel 1.
b. 1+2 - AutoAssigns a frequency to channels 1 and 2.
c. 2 - AutoAssigns a frequency to channel 2.
The frequency assigned to the channel(s) is displayed on the screen. The preset frequency is also displayed when operating in the
UHF band.
4. Select the back arrow to return to the main menu.
To AutoAssign from an existing scan:
1. Enter the menu and select Scan.
2. Select Band to scan the current Band.
3. After the scan completes, select Auto.
4. Select the channel(s) you want to assign.
a. 1 - AutoAssigns a frequency to channel 1.
b. 1+2 - AutoAssigns a frequency to channels 1 and 2.
c. 2 - AutoAssigns a frequency to channel 2.
The frequency assigned to the channel(s) is displayed on the screen. The preset frequency is also displayed when operating in the
UHF band.
5. Select the back arrow to return to the main menu
Astral ARX2 User Guide
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Frequency Band Restrictions
The wireless system operator needs to be aware of local regulations and comply with all applicable laws regarding operation of
wireless devices.
In some restricted frequency bands, the operator will need to obtain an unlock code from Sound Devices to assign a restricted
frequency to the transmitter. Once a license has been granted, please contact Sound Devices (RF_Request@SoundDevices.com)
to obtain the necessary unlock code.
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 Radio Coordinating Council. This organization coordinates a number of 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 ARX2 User Guide
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Audio Output and Control
The Astral ARX2 outputs either analog line level or AES3 digital audio. This global setting applies to both channel outputs.
Analog Output
When set to analog in the Selection Menu the Astral ARX2 outputs low-impedance, balanced line level audio. It is designed to
connect to balanced or unbalanced line level inputs. To unbalance the output, float pin-3.
AES Digital Output
When set to AES output in the Selection Menu the Astral ARX2 outputs two-channel AES3 at 24-bit, 44.1 kHz. Channel 1 output
appears at AES left, channel 2 appears at AES right.
With the A-XLR accessory, the channel 1 XLR connector is used for AES3 output. The channel 2 XLR connector is not active when
set to AES output.
SuperSlot
The Astral ARX2 with A-SL accessory backplate slots directly into the Sound Devices SL-2 for powering, audio, and communication
with the 8-Series Mixer-Recorders. Visit the respective 8-Series Mixer-Recorder User Guide for full details on 8-Series SuperSlot
support of the Astral ARX2.
The Sound Devices SL-6 does not support the full frequency range of the Astral ARX2. When using an Astral ARX2 with SL-6 and
Scorpio, either limit the range to the UHF Band 470-694 MHz or attach antennas directly to the Astral ARX2 bypassing the SL-6 RF
distribution.
User Groups
(For use with A10-TX transmitters only).
The User Groups feature allows for easy, intuitive naming of specific frequencies for A10 transmitters used on set, and grouped
together for faster tuning. The operator of an Astral ARX2 may then easily switch between transmitters by choosing alphanumeric
names, such as “Jack” and “Jill”, instead of having to remember and manually tune to different, specific numerical frequencies.
For instance, a producer or director may want to monitor several different actors’ wireless transmitters. Rather than having to keep a
list of all of their frequencies, each transmitter may be pre-assigned a frequency and given an actor’s name. Then only those pre-
assigned frequencies that have been named will be available as possible options for tuning.
User Group files are created using SD-Utility—a Windows and Mac application available for free download from the Sound Devices
website. https://www.sounddevices.com/download/?prod=sd-utility
Once created, the User Group files are uploaded to A10-TX, A10-RX, or Astral ARX2.
Astral Mini does not support User Groups. User Groups are only available when operating within the UHF Band (470-694 MHz,
country dependent).
To create a new user group:
1. Open SD-Utility on your computer.
2. Do one of the following:
● On a Mac, select User Group File > New.
● On a PC, select File > User Groups > Create a new file.
3. Name the new group.
Astral ARX2 User Guide
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4. Select a range of frequencies via the Band drop-down list. Options include A, B, C, D and Any. This will automatically
restrict users in the group to the frequencies within the frequencies for the various A10-TX models available. Selecting
Any allows all frequencies available on the A10 system for assignment to users in the group.
5. All A10-TX will have the available bands listed on the printed label inside the battery compartment door as well as
displaying the frequencies capable of being generated by the transmitter in Menu > System > Info.
6. Select OK. The User Group Editor screen appears with fields for the first user (U1) available. Enter a Name and
Frequency for U1 in the fields provided. The A10-TX transmitter’s serial number is optional.
7. Entry of ineligible frequencies (or characters) will cause the text in the field to appear red. SD-Utility automatically fills in
.000 as the subchannel variable for frequencies entered as a whole number. SD-Utility automatically follows the best-
practice method of spacing adjacent transmitters by at least one subchannel, preventing possible interference from other
transmitters.
8. Click Add (on a PC) —or the Plus (+) button on a Mac— to add the user to the group. This also adds a new line for the
next user (U2, U3, etc). Each user in a group can be give a name and frequency, which after upload, will then be
displayed on A10 receivers and transmitters. Each group can have up to 32 users.
When the User Group .ALUG file is intended for use on the Astral ARX2, ensure that all user frequencies fall within the
same Astral ARX2 tuning band.
SD-Utility supports the creation of up to eight User Groups, each with a max of 32 users, per User Group file. User Group files have
a file extension of .ALUG.
To add additional user groups:
1. In SD-Utility, select Add Group.
2. Name the new group and select the band of frequencies for the group.
3. Add users (defining name and frequencies) to the group.
User Group files may be saved for future use and modification. When saving the User Group file, SD-Utility defaults the file name to
the first User Group name in the drop-down list.
To load an User Group file into SD-Utility:
1. In SD-Utility, select User Group File > Open.
2. Choose an .ALUG file on your computer.
To remove a user group:
1. In SD-Utility, select a User Group in the drop-down list.
2. Select Remove Group.
Astral ARX2 User Guide
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Sending and Loading User Groups onto Astral ARX2
While each User Group file may contain up to eight user groups, only one group at a time may be sent to and loaded on an Astral
ARX2. A user group is sent to the Astral ARX2-XLR by directly connecting it to a computer via USB. Sending a user group to the
Astral ARX2-SL is achieved via the A10-RACK or the Sound Devices 8-Series Mixer-Recorders with attached SL-2 or SL-6.
For instructions on sending user groups to A10 transmitters, see the A10-TX User Guide or the A10-TX-US User Guide.
To send a user group to an Astral ARX2 via A-XLR, A-TA3, A-RXMON, or A-15PIN:
1. Start the SD-Utility application.
2. Connect the Astral ARX2 via USB to the computer. The A-XLR and A-RXMON connect via Micro-USB. The A-TA3 and A-
15PIN connect via USB-C. Note: A USB 3.0 port is required to power the Astral ARX2 via the A-TA3 and A-15PIN. If a
USB 3.0 port is not available, connect two USB 2.0 ports to the A-TA3 or A-15PIN using the Sound Devices MX-USB Y
USB-C to two USB-A Y-Cable.
3. Load the .ALUG file into SD-Utility.
4. Select Send to RX. SD-Utility detects and displays the connected receiver.
5. Select the Send check box and click Send
To send a user group to Astral ARX2-SL receivers via A10-RACK:
1. Start the SD-Utility application.
2. Connect the A10-RACK to the computer’s USB port.
3. Load the .ALUG file into SD-Utility.
4. Select Send to RX. SD-Utility will detect and display all A10-RX and Astral ARX2 receivers installed in the A10-RACK.
5. Select the check boxes next to each receiver to which you want to send the User Group.
6. Click Send.
To send a user group to Astral ARX2-SL receivers via 8-Series with SL-2:
1. Using an SD card already formatted in an 8-Series Mixer-Recorder, save the .ALUG file to a formatted SD card.
2. Insert the SD card into the 8-Series Mixer-Recorder.
3. With the Astral ARX2-SL receiver(s) in the SL-2, power on the 8-Series Mixer-Recorder.
4. Access the Receiver Overview screen by doing either of the following:
● METERS + HP: Press and hold the METERS button, then press the Headphone encoder.
● Press MENU, then use the Select knob to select SuperSlot>SL-2 Receiver Overview.
5. Select a channel.
6. Slide RTN/FAV switch right to select Options.
7. Select User Groups > User > Load New.
8. Select a user group to load from the User Group file.
Loading User Groups on Astral ARX2
While the SD card can have multiple .ALUG files, each with up to eight groups, only one user group at a time may be loaded to a
receiver.
Astral ARX2 receivers can operate in one of two modes: User and Factory. In Factory mode, frequencies are manually dialed in, but
in User mode (when a user group is loaded), pre-set frequencies are dialed in by user name.
To set the receiver to User mode:
1. Press the Center Menu button on the receiver.
2. Select Settings > User Groups > User.
To dial in a specific User Group frequency:
1. Press the Center Menu button on the receiver.
2. Select Frequency
3. Press the Left or Right button to select one of the user names. The frequency will appear along with the name.
While in User mode, no non-user group frequencies will be selectable. To revert back to manual frequency selection, set
mode to Factory (Menu > Settings > User Groups > Factory.)
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Firmware Update
Periodically Sound Devices issues new firmware for the Astral ARX2 receiver. Make certain to register your product at the Sound
Devices website to receive firmware update notifications.
Firmware is installed on the Astral ARX2 via SD-Utility or via Sound Devices 8-Series Mixer-Recorders. Download the latest
firmware PRG from the Sound Devices website at: https://www.sounddevices.com/download/
SD-Utility
The Sound Devices SD-Utility software utility includes a receiver firmware update tool. SD-Utility is available as a free download for
MacOS 10.11+ or Windows 10+ computers.
Download the latest version of SD-Utility from the Sound Devices website at:
https://www.sounddevices.com/download/?prod=sd-utility
MacOS users need to download and install the CP210x USB to UART Bridge VCP Drivers from the Silicon Labs website. Read
installation instructions.
Astral ARX2 connects to SD-Utility via the A-XLR, A-TA3, A-RXMON, A-15PIN, or A10-RACK.
To update Astral ARX2 firmware via A-XLR, A-TA3, A-RXMON, or A-15PIN:
1. Download new Astral ARX2 firmware PRG file from the Sound Devices website.
2. Launch the SD-Utility application.
3. Connect the Astral ARX2 via USB to the computer. The A-XLR, A-TA3, A-RXMON connect via Micro-USB. The A-15PIN
connects via USB-C. Note: A USB 3.0 port is required to power the Astral ARX2 via the A-15PIN. If a USB 3.0 port is not
available, connect two USB 2.0 ports to the A-15PIN using the Sound Devices MX-USB Y USB-C to two USB-A Y-Cable.
4. Connect a power source to the A-XLR, A-TA3, A-RXMON. The A-15PIN does not require additional power.
5. Power on the Astral ARX2.
6. From SD-Utility, select File > Update RX and then select the firmware PRG file to install.
7. Follow the on-screen prompts.
To update Astral ARX2 firmware via A10-RACK:
1. Download new Astral ARX2 firmware PRG file from the Sound Devices website.
2. Launch the SD-Utility application.
3. Connect the A10-RACK back panel USB-B port to the computer’s USB-A port using a standard USB-A to -B cable.
4. Ensure all Astral ARX2 receivers are properly slotted into the A10-RACK.
5. Power on the A10-RACK and Astral ARX2-SL receivers.
6. From SD-Utility, select File > Update RX and then select the firmware PRG file to install. SD-Utility detects all Astral
ARX2-SL receivers in the A10-RACK. SD-Utility lists all connected Astral ARX2 receivers along with their serial number
and current firmware version.
7. SD-Utility detects receivers running older versions of Firmware and automatically selects them for updating. Otherwise,
select the Update check box for each Astral ARX2 to update, then click Update.
8. Click OK to confirm when prompted. A status bar indicates the progress of each Astral ARX2 update. Receivers are
updated one at a time. As the receiver is updated, its screen displays Programming and the LEDs turn off. After the
update, the receiver returns to normal operation. An Update Complete popup appears after all receivers have been
updated.
9. Click OK when Firmware Update is complete.
Updating Astral ARX2 from Sound Devices Mixer-Recorders
Updating the firmware on the Astral ARX2-SL may be done via the Sound Devices 8-Series Mixer-Recorders, while the receiver is
slotted into the SL-2 or SL-6.
To update Astral ARX2-SL firmware via the Scorpio and SL-6 or the 8-Series and SL-2:
1. Download new firmware PRG file from the Sound Devices website and copy it to an SD card.
Astral ARX2 User Guide
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2. Power on the 8-Series.
3. Insert the SD card into the slot on the side of the 8-Series.
4. Press and hold the METERS button, then press the Headphone knob to access Receiver Overview screen.
5. Turn and press the Select knob to select a receiver. This accesses the Receiver Details screen.
6. Slide RTN/FAV switch to select Options.
7. Select Update Firmware. Confirm the selected file when prompted and select OK to continue.
As the receiver is updated, its screen will display Programming and the LEDs will turn off.
Repeat steps for each receiver in the SL-2 or SL-6.
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Accessories and Adapters
The Astral ARX2 receiver is modular in design. Any of the following accessories can be used with the Astral ARX2, which may be
more suited to a particular workflow or application.
A-SL
25-Pin D-Type Uni/Superslot adapter. Provides power, analog or AES audio and communication with SuperSlot devices.
A-XLR
Breakout cables to 4-Pin Hirose Female DC power in, 4-Pin Hirose Male power loop through, two XLR Males for analog or AES
audio output. Includes Micro-USB for connecting Astral ARX2 to computers for firmware updating and transferring User Group files.
A-TA3
Offers TA4 and Hirose DC inputs, two TA3 connectors for analog or AES audio outputs, USB-C for connecting Astral ARX2 to
computers for firmware updating and transferring User Group files.
A10-RACK
4-slot wireless enclosure. The A10-RACK offers convenient mounting, powering, RF, and audio connectivity for four uni- or
SuperSlot wireless receivers in its 1 RU chassis. The A10-RACK includes built-in antenna distribution with powering for active
antennas. Up to eight channels of audio from single or dual-channel receivers appear on both its XLR outputs and over Dante™
audio-over-Ethernet.
A-15PIN
Cradle for Astral ARX2 with 15pin D-type adapter. For use with Sony camcorders that have slot-in for wireless, or Sony extension
units with slot-in for wireless. The A-15PIN allows the Astral ARX2 to be used in the Sony slot without the need for external cables.
The audio is passed through the internal slot as a 2 channel AES input. When connected to the camcorder via the A-15PIN, the
Astral ARX2 receives power and powers up and down with the camcorder.
Installation instructions for the A-15PIN and a list of supported Sony cameras can be found on the Sound Devices website:
https://www.sounddevices.com/a-15pin-installation/
A-RXMON
Monitor transmitters on set with this handy belt-worn headphone amp for your Astral ARX2. The A-RXMON provides a simple,
portable solution for easily monitoring two transmitter audio channels with headphones. See the A-RXMON User Guide for more
details.
A-VHF-HEL-SMA
Set of 2 helical dipole antennas with SMA connectors for the VHF (169 - 220 MHz) band.
Attaching Astral ARX2 Backplate Accessories
Use the following instructions when removing and attaching the A-XLR, A-TA3, and A-SL.
1. Remove the four perimeter screws of the attached backplate accessory. Set screws aside for later use.
For the A-SL, do not remove the two screws on either side of the 25-pin D-Type connector.
Astral ARX2 User Guide
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2. Remove the attached accessory.
3. Position the new accessory making connection to the Astral ARX2’s Multi-Pin Accessory connector, then replace the
screws removed in step 1.
Astral ARX2 User Guide
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Connector Pin Assignments
Astral ARX2-SL/DB-25 Connector Pin Assignments
The illustration below shows the pin assignments of the Astral ARX2-SL when viewing the bottom connector.
DB-25 Pin
Name
Description
1
Ground
Ground connection
2
Ch 1+ analog /
Ch 1,2 AES +
Ch 1 + analog audio out, +2 dBu level (+/- 0.5 dB), balanced.
Alternately, Ch1 and Ch 2 AES3+ (balanced, 110 ohm, transformerless).
3
Ch 1 - analog /
Ch 1,2 AES -
Ch 1 - analog audio out, +2 dBu level (+/- 0.5 dB), balanced.
Alternately, Ch 1 and Ch 2 AES3- (balanced, 110 ohm, transformerless).
4
Ground
Ground for power
5
6-18 VDC
Power supply, 6.0-18.0 V, 6 W max.
6 though 12
no connection
13
Ground
Ground connection
14
Ground
Ground connection
15
Ch 2+ analog
Ch 2 + analog audio out, +2 dBu level (+/- 0.5 dB), balanced.
16
Ch 2- analog
Ch 2 - analog audio out, +2 dBu level (+/- 0.5 dB), balanced.
17 through 21
no connection
22
UART transmit (0/3.3V)
UART from Astral ARX2. 0/3.3V signaling.
23
UART receive (0/3.3V)
UART to Astral ARX2. 0/3.3 V signaling.
24
no connection
25
Ground
Ground connection
Astral ARX2 User Guide
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Astral ARX2-XLR/A-XLR Connector Pin Assignments
The illustration below shows the pin assignments of the Astral ARX2-XLR when viewing the break-out connectors.
Connector
Pins
Name
Description
XLR Output 1
1
Ground
Ground connection
2
Ch 1+ analog /
Ch 1,2 AES +
Ch 1 + analog audio out, +2
dBu level (+/- 0.5 dB),
balanced.
Alternately, Ch1 and Ch 2
AES3+ (balanced, 110 ohm,
transformerless).
3
Ch 1 - analog /
Ch 1,2 AES -
Ch 1 - analog audio out, +2
dBu level (+/- 0.5 dB),
balanced.
Alternately, Ch 1 and Ch 2
AES3- (balanced, 110 ohm,
transformerless).
XLR Output 2
1
Ground
Ground connection
2
Ch 2+ analog
Ch 2 + analog audio out, +2
dBu level (+/- 0.5 dB),
balanced.
3
Ch 2 - analog
Ch 2 - analog audio out, +2
dBu level (+/- 0.5 dB),
balanced.
Hirose DC In
1
Power -
2
Not connected
3
Not connected
4
Power +
6-18 VDC
Hirose DC Loop-Through
1
Power -
2
Not connected
3
Not connected
4
Power +
6-18 VDC
Micro-USB
No pin out shown
Provides connection to computer for updating firmware and
transferring files. Micro-USB does not power the unit. If using Micro-
USB, power needs to be applied to the Hirose In.
Astral ARX2 User Guide
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Astral ARX2-TA3/A-TA3 Connector Pin Assignments
The illustration below shows the pin assignments of the Astral ARX2-TA3 when viewing the bottom connectors.
Connector
Pins
Name
Connection
TA3 Output 1
1
Ground
Ground connection
2
Ch 1+ analog /
Ch 1,2 AES +
Ch 1 + analog audio out, +2
dBu level (+/- 0.5 dB),
balanced.
Alternately, Ch1 and Ch 2
AES3+ (balanced, 110 ohm,
transformerless).
3
Ch 1 - analog /
Ch 1,2 AES -
Ch 1 - analog audio out, +2
dBu level (+/- 0.5 dB),
balanced.
Alternately, Ch 1 and Ch 2
AES3- (balanced, 110 ohm,
transformerless).
TA3 Output 2
1
Ground
Ground connection
2
Ch 2+ analog
Ch 2 + analog audio out, +2
dBu level (+/- 0.5 dB),
balanced.
3
Ch 2 - analog
Ch 2 - analog audio out, +2
dBu level (+/- 0.5 dB),
balanced.
TA4 DC In
1
Power -
2
Not connected
3
Not connected
4
Power +
6-18 VDC
Hirose DC In
1
Power -
2
Not connected
3
Not connected
4
Power +
6-18 VDC
USB-C
No pin out shown
Provides connection to computer for updating firmware and transferring
files. USB-C does not power the unit. If using USB-C, power needs to
be applied to the TA-4 or Hirose.
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Astral ARX2 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
RF Tuning
● 169 to 1525 MHz
● SpectraBand Technology
● Transmitters tunable in 25 kHz steps
● Available frequencies depend on country of operation
Modulation
● Proprietary digital RF modulation
● Standard or Long Range, selectable
Latency
● Standard modulation = 2 ms
● Long Range modulation = 3.9 ms
● Measured at analog output
Audio Frequency Response
● 10 Hz–20 kHz
Low Cut
● Off, 40 Hz, 60 Hz, 80 Hz, 100 Hz, 200 Hz
● 3rd order, 18dB/oct roll off.
Limiter
● Attack: 1 ms, Threshold: -6 dBFS, Release: 100 mS, Ratio: 20:1
Maximum Output Level
● +14 dBu, +2 dBu, -10 dBu, or -22 dBu, menu-selectable, with a 0 dBFS signal at the transmitter input, 130 ohms output
impedance
Digital Audio Output
● AES3 balanced connection, 110 ohms output impedance, left=channel 1, right=channel 2
Menu and Controls
● OLED menu display, 3 button navigation
Privacy
● User settable 4-digit PIN
Powering
● 6–18 VDC, approx 3.1 W with one receiver active, approx 4.2 W with two receivers active
Operating Temperature Range
● -10 °C to +55 °C
Weight
● 165 g, 5.8 oz, Measured without backplate accessories
Dimensions (H x W x D)
● 113.7 mm x 78.5 mm x 26.6 mm, 4.48 in x 3.09 in x 1.05 in, Measured without backplate accessories
Astral ARX2 User Guide
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Antenna Guide
The SMA antenna connectors are used to mount the included 1/4-wave whip antenna. For specialty applications external, high-gain
receiving antennae can be attached to the SMA connectors. Ensure that the antennae used are built for the correct frequency.
For best operation and reception with the included 1/4-wave antenna, keep it in the free field, away from metal objects or
transmitting devices.
The Astral ARX2 ships with an antenna set which includes:
● 2 470-548 MHz antennas (1 straight, 1 right-angle)
● 2 548-638 MHz antennas (1 straight, 1 right-angle)
● 2 uncut antennas (1 straight, 1 right-angle)
● 6 antenna caps
Sound Devices offers additional pre-cut and uncut antennas as available options. In addition, a set of 2 helical dipole antennas (A-
VHF-HEL-SMA) with SMA connectors is available for the VHF (169 - 220 MHz) band.
Attach antennas with a length specific to the frequency in use. Using the wrong length of antenna reduces RF range.
Cutting Antennas to Length
Uncut antennas need to be cut to the length specific to the frequency for intended use.
● Determine the frequency range intended for the uncut antenna using the Antenna Length chart.
● Measure the antenna for the cut point. Measurements should begin from the bottom of the SMA connector.
● Using a pair of cutters, cut the quarter-wave antenna at the specified cut point.
● Position the antenna cap onto the cut-end of the antenna and push the cap firmly onto the antenna.
#
Frequency Range
Antennae Length in
mm
Antennae Length in inches
1
169 - 216 MHz
388 mm
15.28”
2
470 - 548 MHz
140 mm
5.51”
3
548 - 663 MHz
120 mm
4.72”
4
638 - 738 MHz
104 mm
4.09”
5
738 - 865 MHz
89 mm
3.50”
6
902 - 1015 MHz
74 mm
2.92”
7
1045 - 1154 MHz
65 mm
2.55”
8
1240 - 1260 MHz
57 mm
2.24”
9
1350 - 1525 MHz
49 mm
1.93”
Astral ARX2 User Guide
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Servicing the Astral ARX2
Do not attempt to service the Astral ARX2. The internal parts are microscopic and not user serviceable. Please send to Sound
Devices for any service needs. https://service.sounddevices.com/contact-support/
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. In order 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. Product 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
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
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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 trademark of Apple Inc. All other trademarks herein are the property of their respective
owners.
FCC Conformity
The Astral ARX2 receiver complies with the following requirements: FCC (Federal Communications Commission) Part 15
Operation is subject to the following two conditions:
(1) This device may not cause harmful interference, and
(2) This device must accept any interference received, including interference that may cause undesired operation.
Industry Canada Conformity
This radio transmitter has been approved by Industry Canada to operate with the supplied monopole whip antenna only. Other
antenna types are strictly prohibited for use with this device.
This device operates on a no-protection no-interference basis. Should the user seek to obtain protection from other radio services
operating in the same TV bands, a radio license is required. Please consult Industry Canada’s document CPC-2-1-28, ‘Optional
Licencing for Low-Power Radio Apparatus in the TV Bands’, for details.
This device complies with Industry Canada’s license exempt RSSs. 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.
Le présent appareil est conforme aux CNR d’Industrie Canada applicables aux appareils radio exempts de licence. L’exploitation est
autorisée aux deux conditions suivantes:
(1) l’appareil ne doit pas produire de brouillage, et
(2) l’utilisateur de l’appareil doit accepter tout brouillage radioélectrique subi, même si le brouillage est susceptible d’en
compromettre le fonctionnement. .
WEEE Statement
If you wish to discard a Sound Devices product in Europe, contact Sound Devices (England) for further information.
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Declaration of Conformity
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