A20-RX
Two-Channel, True Diversity Receiver
with SpectraBand Technology
User Guide v6.00
Table of Contents
A20-Mini GainForward Input Menu 13
Frequency Band Restrictions 24
Experience ultimate flexibility as you find available spectrum away from the crowded UHF TV band. The A20-RX two channel true diversity receiver features SpectraBand technology, which delivers a tuning range of 470 – 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.
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.
We are honored to be part of your kit.
Sincerely,
Sound Devices
The A20-RX introduces SpectraBand, a technology that enables the A20-RX to tune over a super wide range of 470-1525 MHz.
Tuning within this range varies by country. For instance:
In the USA, the available frequency ranges are:
In the UK, the available frequency ranges are:
Please see https://www.sounddevices.com/available-frequencies/ for further detailed information on which frequency ranges are available for each country.
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
3 & 8: Channel 1 & 2 Green/Red RF Status LEDs
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).
Bottom Panel
1: Screw Holes
Used to secure various backplate accessories to the A20-RX.
2: Multi-Pin Accessory Connector
Allows connection to various accessories and adapters. A20-RX either includes the A-SL, A-XLR, or A-TA3 (coming soon), depending on the model purchased. See Accessories and Adapters for details.
Navigating the A20-RX 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 A20-RX interface. Various screens and menus are described in detail throughout this User Guide.
The A20-RX 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 A20-RX 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.
The A20-RX is powered when DC power is present. There are no additional power switches.
A-SL
With the A-SL attached, the A20-RX 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 (coming soon)
With the A-TA3 attached, the A20-RX receives power from the 4-pin Hirose female connector or TA-4 connector.
A-XLR
With the A-XLR attached, the A20-RX 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 A20-RX receives power from its attached Sony L-Mount style battery.
A-15PIN
With the A-15PIN attached, the A20-RX receives power via the 15-pin connector from the Sony camera.
Channel Power
Each of the two channels of the A20-RX can be powered on or off individually. When a channel is powered down that portion of the A20-RX no longer draws power. When using A20-RX for a single wireless channel, best practice is to power down the unused channel.
Channel Power LEDs
The A20-RX has blue Channel Power LEDs for each of its two channels. When first powering the A20-RX without transmitters present, the LEDs illuminate indicating the receiver channel is powered.
The receiver channel can connect, or pair, to an A10-TX or A20-Mini transmitter that is powered on and set to the receiver frequency. The Channel Power LED then shows the battery status of its associated transmitter.
When a paired 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.
To power a channel on or off:
Using shortcuts to power channels on or off:
Standby Mode
The A20-RX 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:
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.
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 paired with an A10-TX, pressing the Left or Right button again shows the A10-TX Information screen.
When the channel is paired with an A10-TX, pressing the Left or Right button again shows the A10-TX Information screen.
When the channel is paired with an A20-Mini, pressing the Left or Right button enters the A20-RX Input menu. The Input Menu is not available when the A20-RX is connected to the 833, 888, or Scorpio via the SL-2 or SL-6. With this setup the A20-Mini Information screen is displayed. See GainForward Input Menu for more details.
Mute Function on the Transmitter
When the A10-TX or A20-Mini audio is muted from the transmitter, the A20-RX 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.
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 A20-RX’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:
Display Orientation
The A20-RX 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
.
The A20-RX supports the A20-Mini’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 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 A20-RX 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 A20-Mini transmitted signal.
When the A20-RX receiving A20-Mini signal is slotted into the SL-2 or SL-6, the A20-RX 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 A20-Mini signal.
| |
Low Cut Sets the Low Cut Filter frequency for the incoming A20-Mini signal.
| |
Limiter Sets the Limiter of the incoming A20-Mini signal.
| |
Information Displays the paired A20-Mini’s name and the A20-RX’s Input Gain and Low Cut values. |
The A20-RX 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. | |
Outputs Enters the Outputs sub-menu.
| |
Scan Enters the Scan menu. Scanner displays RF activity. Perform a scan on any available Band in the 470-1525 MHz range, 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. See Scan for more information. | |
Privacy Privacy is available on the A10-TX and the A20-RX. When enabled on the A10-TX the transmitted RF signal is encrypted. In order to be received a four-digit code must be entered.
See Privacy for more information. | |
Settings Enters the Settings sub-menu.
| |
System Enters the System sub-menu.
|
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 A20-RX is mounted via A-SL to SL-2 and 8-Series.
| |
Audio Polarity Selects the polarity of the balanced output signal. Setting applies per channel. Audio Polarity is not available when A20-RX is mounted via A-SL to SL-2 and 8-Series.
| |
Mode Choose the audio output type of the A20-RX. When the A20-RX-XLR is set to AES the channel 2 XLR connection is not used. This setting applies to both channels. Mode is not available when A20-RX is mounted via A-SL to SL-2 and 8-Series.
| |
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.
|
Settings Sub-menu
Icon | Description |
Exit Returns to the Main menu. | |
Selects Standard or Long Range Modulation. The Modulation setting must match between the A20-Mini or A10-TX and the A20-RX in order for the transmitted signal to be received.
| |
User Groups Sets whether receiver utilizes user groups (User) or manual frequency selection (Factory). See User Groups for more information
| |
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.
| |
LEDs When set to On the LEDs remain illuminated. Off deactivates the LEDs.
|
Display Sub-menu
Icon | Description |
Exit Returns to the Main menu. | |
Screen Brightness Sets the brightness of the OLED screen.
| |
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.
| |
Orientation Sets the operating orientation of A20-RX in relation to the buttons, screen, and LEDs. The A20-RX can be used in an orientation with the buttons below the screen (normal), or with the buttons to the top (flipped).
| |
Options Sets whether Frequency or TV Channel is displayed on the main display.
| |
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.
|
System Sub-menu
Icon | Description |
Exit Returns to the Main menu. | |
Power Turns power for RF receiver channel 1 and 2 on and off.
| |
Restore The restore function resets the A20-RX to the factory default settings. Restore sets Country to Other. Select the current Country in your locality before proceeding.
| |
Info Shows information about the A20-RX
|
The A20-RX is easy and quick to setup.
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.
To Set Country:
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 A20-Mini or A10-TX and the A20-RX in order for the transmitted signal to be received.
SpectraBand
The A20 Digital Wireless System incorporates SpectraBand technology. This allows operation across a frequency range of 470 - 1525 MHz making it possible to find available frequencies wherever you are.
To Set Band:
Select Set to confirm the selection or select the back arrow to cancel the Band change and return to the Frequency menu.
Frequency
Because the A10 and A20 digital RF transmission is inherently immune to intermodulation, multiple A10 and A20 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:
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.
TV Ch is not displayed or accessible throughout the A20-RX user interface when Band falls outside of the UHF band (470-694 MHz, country dependent).
To change frequency using TV Channel Frequency Presets:
Frequency Scanning
The frequency scanning tool uses the radios in the A20-RX 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 audio is muted while scanning.
Scan Options
The frequency range scan options vary depending on country.
To perform an RF Scan:
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?
Frequency AutoAssign
AutoAssign scans the current tuning band and selects available frequencies for the A20-RX’s two channels. This feature is designed to make frequency selection quick and easy. There are two ways to AutoAssign frequencies:
To AutoAssign frequencies without a prior scan:
The frequency assigned to the channel(s) is displayed on the screen. The preset frequency is also displayed when operating in the UHF band.
To AutoAssign from an existing scan:
The frequency assigned to the channel(s) is displayed on the screen. The preset frequency is also displayed when operating in the UHF band.
Antennae
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. See Antenna Guide for more details.
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 A20-RX 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 A20-RX 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 A20-RX 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 A20-RX-XLR the channel 1 XLR connector is used for AES3 output. The channel 2 XLR connector is not active when set to AES output.
The A20-RX-SL (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 A20-RX.
The Sound Devices SL-6 does not support the frequency range of the A20-RX. When using an A20-RX-SL with SL-6 and Scorpio, either limit the range to the UHF Band 470-694 MHz or attach antennas directly to the A20-RX-SL bypassing the SL-6 RF distribution.
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 (R[email protected]) 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)
Similar to the 914.5 - 944 MHz band,nationwide licenses are not typically granted for wireless operation in 1435-1525 MHz.
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/
The User Groups feature allows for easy, intuitive naming of specific frequencies for each A10 transmitter used on set, and grouped together for faster tuning. The operator of an A20-RX 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 A20-RX.
A20-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:
When the User Group .ALUG file is intended for use on the A20-RX, ensure that all user frequencies fall within the same A20-RX 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:
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:
To remove a user group:
Sending and Loading User Groups onto A20-RX
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 A20-RX. A user group is sent to the A20-RX-XLR by directly connecting it to a computer via USB. Sending a user group to the A20-RX-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 A20-RX via A-XLR, A-TA3, A-RXMON, or A-15PIN:
To send a user group to A20-RX-SL receivers via A10-RACK:
To send a user group to A20-RX-SL receivers via 8-Series with SL-2:
Loading User Groups on A20-RX
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.
A20-RX 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:
To dial in a specific User Group frequency:
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.)
Periodically Sound Devices issues new firmware for the A20-RX receiver. Make certain to register your product at the Sound Devices website to receive firmware update notifications.
Firmware is installed on the A20-RX 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.
A20-RX connects to SD-Utility via the A-XLR, A-TA3, A-RXMON, A-15PIN, or A10-RACK.
To update A20-RX firmware via A-XLR, A-TA3, A-RXMON, or A-15PIN:
To update A20-RX firmware via A10-RACK:
Updating A20-RX from Sound Devices Mixer-Recorders
Updating the firmware on the A20-RX-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 A20-RX-SL firmware via the Scorpio and SL-6 or the 8-Series and SL-2:
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.
The A20-RX comes in three models:
The A20-RX receiver is modular in design. Any of the following accessories can be used with the A20-RX, 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 A20-RX 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 A20-RX 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 A20-RX 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 A20-RX 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 A20-RX 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 A20-RX. 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.
Attaching A20-RX Backplate Accessories
Use the following instructions when removing and attaching the A-XLR, A-TA3, and A-SL.
For the A-SL, do not remove the two screws on either side of the 25-pin D-Type connector.
A20-RX-SL/DB-25 Connector Pin Assignments
The illustration below shows the pin assignments of the A20-RX-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 | no connection | |
7 | no connection | |
8 | no connection | |
9 | no connection | |
10 | no connection | |
11 | no connection | |
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 | no connection | |
18 | no connection | |
19 | no connection | |
20 | no connection | |
21 | no connection | |
22 | UART transmit (0/3.3V) | UART from A20-RX. 0/3.3V signaling. |
23 | UART receive (0/3.3V) | UART to A20-RX. 0/3.3 V signaling. |
24 | no connection | |
25 | Ground | Ground connection |
A20-RX-XLR/A-XLR Connector Pin Assignments
The illustration below shows the pin assignments of the A20-RX-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. |
A20-RX-TA3/A-TA3 Connector Pin Assignments
The illustration below shows the pin assignments of the A20-RX-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. |
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
Modulation
Latency
Audio Frequency Response
Maximum Output Level
Digital Audio Output
Menu and Controls
Privacy
Powering
Operating Temperature Range
Weight
Dimensions(H x W x D)
The A20-RX ships with an antenna set which includes:
Sound Devices offers additional pre-cut and uncut antennas as available options.
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.
# | Frequency Range | Antennae Length in mm | Antennae Length in inches |
1 | 470 - 548 MHz | 140 mm | 5.51” |
2 | 548 - 663 MHz | 120 mm | 4.72” |
3 | 638 - 738 MHz | 104 mm | 4.09” |
4 | 738 - 865 MHz | 89 mm | 3.50” |
5 | 902 - 1015 MHz | 74 mm | 2.92” |
6 | 1045 - 1154 MHz | 65 mm | 2.55” |
7 | 1240 - 1260 MHz | 57 mm | 2.24” |
8 | 1350 - 1525 MHz | 49 mm | 1.93” |
Do not attempt to service the A20-RX. The internal parts are microscopic and not user serviceable. Please send to Sound Devices for any service needs. https://service.sounddevices.com/contact-support/
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
Included Accessories
The A20-RX includes the following accessories.
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 trademark of Apple Inc. All other trademarks herein are the property of their respective owners.
FCC Conformity
The A20-RX 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.
Post Office Box 576
E7556 State Rd. 23 and 33
Reedsburg, Wisconsin 53959 USA
+1608.524.0625 main
800.505.0625 toll free (U.S. only)
www.sounddevices.com
A20-RX User Guide
