Audio A10-TX-US User manual

A10-TX-US
Digital Transmitter
—User Guide —

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A10-TX-US User Guide
Copyright / Doc Rev History Info
Model A10-TX-US only. See separate documentation for A10-TX model.
Copyright © 2018 Audio Ltd. All rights reserved. | www.audioltd.com
7 Century Court, Tolpits Lane, Watford WD18 9RS, UK | [email protected]
Revision Date Description
1A Dec 2017 Initial Publication
1B Feb 2018 Added note re: Bluetooth remote range
1C Apr 2018 Edits made in sections: Specications and Certications
1D May 2018 Added v1.05 change (i.e. Orientation setting)
1E July 2018 Added v2.00 information about new recording feature
Copyright / Doc Rev History Info . . . . . . . 2
Overview . . . . . . . . . . . . . . . . . . . . 3
Key Features . . . . . . . . . . . . . . . . 3
System Quickstart . . . . . . . . . . . . . . . 4
At the Receiver . . . . . . . . . . . . . . . 4
At the Transmitter . . . . . . . . . . . . . . 4
At the Receiver . . . . . . . . . . . . . . . 4
Connectors, Controls Description . . . . . . 5
Powering . . . . . . . . . . . . . . . . . . . . 6
Main Display . . . . . . . . . . . . . . . . . . 6
Menu Control and Menu Selections . . . . . 7
Main Menu . . . . . . . . . . . . . . . . . 7
Audio Setup Menu . . . . . . . . . . . . . 8
Record / TC Menu . . . . . . . . . . . . . 8
Settings Menu . . . . . . . . . . . . . . . 9
System Menu . . . . . . . . . . . . . . . . 9
Basic Operation . . . . . . . . . . . . . . . . 10
Frequency Selection . . . . . . . . . . . . 10
Channel, Sub Channel, Frequency . . . . . 10
Audio Input and Control . . . . . . . . . . 10
Lavalier Microphones . . . . . . . . . . . 10
Balanced Microphones with Phantom . . . 10
Line-Level Sources . . . . . . . . . . . . . 10
Audio Level Control . . . . . . . . . . . . . 11
Antenna . . . . . . . . . . . . . . . . . . . 11
Recording . . . . . . . . . . . . . . . . . . 11
File Storage . . . . . . . . . . . . . . . . . 12
File Conversion .MIC to .WAV . . . . . . . . 12
Timecode and Time-of-Day Clocks . . . . . 12
Time-of-Day Clock . . . . . . . . . . . . . 12
External LTC Jamming. . . . . . . . . . . . 12
Timecode Output . . . . . . . . . . . . . . 13
Remote Control . . . . . . . . . . . . . . . . 13
Firmware Updates . . . . . . . . . . . . . . . 15
Specications . . . . . . . . . . . . . . . . . 15
Input Connector Wiring Diagram . . . . . . 16
Battery Runtime Chart . . . . . . . . . . . 16
Certications . . . . . . . . . . . . . . . . . 17
FCC Conformity . . . . . . . . . . . . . . . 17
Declaration of Conformity. . . . . . . . . . 17
Minimize RF Exposure . . . . . . . . . . . 17
Frequency Tables . . . . . . . . . . . . . . . 18
X Frequencies (6 MHz Per TV Channel) . . 18
Y Frequencies (7 MHz Per TV Channel) . . 19
Z Frequencies (8 MHz Per TV Channel) . . 20
Channel Assignments by Region . . . . . . 20
Table of Contents

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A10-TX-US User Guide
Overview
The A10 Digital Wireless System meets the demanding requirements of the professional
sound community engaged in lm and television production. It oers superb audio and RF
performance.
The digital RF transmission of the A10 system allows the user to operate up to 20 channels in
an 8 MHz TV channel, maximising spectrum eciency without compromising on range, audio
quality or latency.
The A10-TX-US is the U.S.-only version of the transmitter. It incorporates Audio Ltd’s
proprietary digital modulation scheme whilst maintaining the high audio quality that Audio Ltd
has become renowned for, and with extremely low end-to-end latency of 2 mS.
The A10-TX-US has an intuitive menu system allowing the user to become familiar with settings
within a few minutes of turning it on.
The A10-TX transmitter oers a universal audio input accepting two-wire lavalier microphones,
balanced microphones (selectable 12V or 48V phantom power), and balanced line-level signals.
It includes an integrated digital recorder with a precision timecode generator (recording not
available with lavalier microphones in U.S. market transmitters). An internal microSD card in the
transmitter stores audio data in proprietary .mic format. The free Mic-to-WAV utility for Mac OS
and Windows converts .mic les into industry-standard broadcast WAV les with timecode.
Key Features
• Low-noise, studio-grade balanced input for microphones and line level signals with analogue
limiter and phantom power.
• Fully digital RF transmission
• Integrated digital recorder with precision timecode generator (for Mic / Line-level operations)
• Remote controllable over Bluetooth® using the A10-TX-US Remote app for Android and iOS.
• Powered by easy-to-access AA batteries.

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A10-TX-US User Guide
System Quickstart
The A10 Digital Wireless System is easy to use. Follow the steps below for basic setup and
operation.
At the Receiver
1. Fit the included straight and right-angled antennas to the A10-RX receiver.
2. Connect the receiver to a power source. It will immediately power on.
3. Using the scanning tool in the Selection menu nd an available open frequency. If multiple
wireless systems are in use, make certain to keep frequencies least 400 kHz apart.
4. Connect the audio output from channel 1, channel 2, or both to an audio input on a mixer,
recorder, camera, or PA system.
5. Ensure that the receiver audio output type and level are set based on the input type.
At the Transmitter
1. Attach the straight antenna to the A10-TX-US.
2. Attach an audio source to the 3-pin LEMO input connector.
3. Insert AA batteries into the A10-TX-US battery compartment and power on the unit with the
red On/O button.
4. Set the audio input type to set to match the connected input.
5. Set the transmitting frequency on the A10-TX-US match the frequency set on the A10-RX
receiver channel.
6. Adjust the audio gain according to your environment and source, taking care not to overload
the signal. This is indicated by a red LED.
At the Receiver
1. Conrm that the blue channel power LED is solid blue.
2. Conrm that the RF status LEDs and display indicate good RF strength on both antennas.
3. Conrm that the audio level at the receiver corresponds to the audio connected to the A10-
TX-US input.
4. The system is now ready for use.

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A10-TX-US User Guide
Connectors, Controls Description
2
1
3
49
12
11
6
7
10
5
8
Figure 1: A10-TX-US transmitter with open battery compartment
1 - Antenna Socket
SMA connector, 50 ohm, connects to includ-
ed 1/4-wave whip antenna.
2 - Power LED
Blue LED illuminates when unit is powered
on. Flashes when unit is in sleep mode. LED
can be turned o in the Menu.
3 - Display
OLED screen. Screen automatically turns o
during operation for battery savings.
4 - Left Menu Button
Moves selection in menu to the left, or decre-
ments values.
5 - Power Button
Press to power on the unit. Press and hold to
power down the unit.
6 - Audio Input Connector
Balanced LEMO-3 connector. Accepts mul-
tiple audio input types including unbalanced
lavalier, balanced microphone, balanced line.
Also used for timecode input and output.
7 - Input Overload LED
Red LED illuminates when input signal is
3dB before clipping.
8 - Menu Button
Enters the menu selection. Also used to select
options in the menu.
9 - Right Button
Moves menu selection to the right, enters
record status screen, or increments values.
10 - microSD Card Slot
The card slot is used to record les and load
rmware updates on the unit.
11 - Battery Tray
Accepts two AA LR6 batteries.
12 - Battery Door Latch
Press both latches to open the battery door.

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A10-TX-US User Guide
Powering
The A10-TX-US is powered by two AA (LR6) batteries. For the longest runtime use Lithium
primary cells. The transmitter also accepts alkaline primary and Nickel Metal Hydride
rechargeable batteries. Select the battery type used in the menu to ensure that the battery
condition is indicated accurately in both the transmitter display and receiver.
1. Open the battery compartment by pressing both mechanical releases simultaneously. (See
Figure 1.)
2. Insert two fresh AA type (LR6) batteries. Note correct battery polarity.
3. Momentarily press the red On/O button. The blue power LED will light and the display will
illuminate. The transmitter is now powered on.
4. To turn the transmitter o, press and hold the red button until the “turning o’ progress bar
completes and the unit goes dark.
Main Display
After powering on the A10-TX-US the display shows the following.
Battery Condition
Input
Gain
RF Output
Power
Frequency in MHz
Frequency as
Channel–Sub Channel
Input Level
Meter
Record
Indicator
• RF Output Power - three power levels are indicated, Low (10 mW), Medium (20 mW),
High (50 mW)
• Input Gain - gain applied to the input source, in dB
• Battery Condition - shows the battery voltage level of the transmitter batteries, ve-
segments
• Frequency in MHz - the transmitting frequency is shown
• Frequency in Channel–Sub Channel - the transmitting frequency is shown in region,
channel, and sub channel
• Input Level Meter - shows audio input signal level
• Record “dot” Indicator - ashes in top left corner when recording is underway. The record
feature is not available for Lavalier operations. For more information, see Recording.
Press the Left button, to view the name of the transmitter. The serial number of the transmitter
is the default name of the transmitter. The transmitter name can be changed in the A10-TX-US
Remote app.
From the main screen on the transmitter, pressing the Right button shows record status
information, such as le name (when recording), le duration, remaining record time, timecode
values, and frame rate. Record status information is unavailable for Lavalier operations.

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A10-TX-US User Guide
Menu Control and Menu Selections
The A10-TX-US transmitter is controlled through its menu. Enter the menu via the centre Menu
button. Once in the menu the Left and Right buttons toggle among options, and the Menu button
makes the selection.
Main Menu
Selections Icon Description Options
Exit Returns to the main display screen.
Frequency Selection Sets the transmitter’s frequency. Frequency
selection and channel increments change based on
the region of operation the unit is set.
• TV Channel Increments
• Sub Channel Increments
• Frequency Increments in 25 kHz steps
Audio Gain Controls the gain range of the audio input. Gain
range is input type dependent. Gain control is in 1
dB increments.
• Lavalier: 0 dB to +40 dB
• Line setting: -10 to 16 dB
• Mic setting: 16 to 40 dB w/20dB pad
• Mic setting: 36 to 60 dB
Audio Setup Enters the Audio Setup sub-menu. • Low Cut
• Limiter
• Lav / Mic / Line
Record / TC Enters the Record / TC sub-menu. • Record
• File Info
• TX / Record Mode
• Timecode
• Frame Rate
ªTimecode and Frame Rate are the only options available for Lavalier operations.
Privacy Activates transmission privacy with a four-number
key set on the transmitter and receiver. When
active, the receiver must be set to the corresponding
key for audio to pass.
New Key option generates a key. The key symbol
is displayed on main default screen when privacy
is active.
• New Key - generates new key
• O - encryption cleared, set to ----, not
active
Settings Enters the Setting sub-menu. • Bluetooth
• RF Power
• Brightness
• Battery Type
• Blue LED
• TV Ch Map
System Enters the System sub-menu. • Sleep
• Lock Menu
• Set Time/Date
• Format Card
• Restore
• Info
• Update Firmware

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A10-TX-US User Guide
Audio Setup Menu
Selections Icon Description Options
Exit Returns to the main menu.
Low Cut Activates a low frequency cut lter to the audio
input. 18 dB/octave
• O
• 40 Hz
• 60 Hz
• 80 Hz
• 100 Hz
• 200 Hz
Limiter The limiter reduces peak levels of the analogue
audio input before digital conversion to prevent
audio overload. The recommended setting is On.
• On
• O
Lav / Mic / Line Selects the input type at the LEMO-3 connection.
ªFor Mic/Line, the AC-BAL-XLR accessory is
required.
• Lav
• Mic
• Line
• P48 - mic level with 48 V phantom
• P12 - mic level with 12 V phantom
Record / TC Menu
Selections Icon Description Options
Exit Returns to the main menu.
Record * Select Record to enter Record mode (This begins
recording). The Record status is remembered
across sleep and power cycles.
File Info * Shows important information about the le being
recorded.
• Time Elapsed
• Time Remaining
• Timecode
• File Name
TX / Record Mode * Select the operational mode of the A10-TX. • TX/Rec - simultaneous wireless
transmission and recording
• RecOnly - recording function only
Timecode Enter Timecode menu.
Timecode values from either the attached external
timecode generator or the internal generator are
shown.
ªWhilst in this menu, wireless transmission is
suspended, and timecode may be sent via AC-
TCBNC-OUT or AC-TCLEMO accessories.
• Time of Day
• External
• Jam - applies external timecode to the
internal generator.
ªJamming to an external timecode
source requires the AC-TCBNC-IN
or AC-TCLEMO accessories.
Frame Rate Sets the frame rate of the timecode clock. Select a
rate that matches the incoming timecode rate.
ªRejam is required after setting frame rate.
• 23.98
• 24
• 25
• 29.97
• 29.97 DF
• 30
• 30 DF
* These options are only available when Audio Setup > Lav / Mic / Line is set to Line or Mic level options. They are not available for Lavalier
operations.

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A10-TX-US User Guide
Settings Menu
Selections Icon Description Options
Exit Returns to the main menu.
Bluetooth Toggles Bluetooth On or O. Bluetooth oers
external control of the A10-TX via the A10-TX
Remote App (for iOS or Android).
• On
• O
RF Power Sets the RF output power of the transmitter. • Low - 10 mW
• Med - 20 mW
• High - 50 mW
Brightness Sets the brightness of the OLED screen Five increments, 1–5,
5 is brightest
Battery Type For accurate display of battery condition on the
transmitter and receiver select the battery type
from the available options.
• Alkaline
• NiMH
• Lithium
Blue LED If set to On, the LED illuminates blue when
powered on and screensaver is active.
• On
• O
TV Ch Map Selects the TV channel spacing in MHz to ensure
channel selection cooresponds to a specic
geographic region. See frequency chart.
• X – 6 MHz
• Y – 7 MHz
• Z – 8 MHz
Orientation Sets orientation of display — ideal for when
transmitter is attached upside down on boom pole.
• Normal (default)
• Flipped
System Menu
Selections Icon Description Options
Exit Returns to the main menu.
Sleep When selected, the A10-TX goes into low-power
Sleep mode. The blue LED ashes when the
unit is in a sleep state. The unit returns to normal
power operation when any button is pressed or the
transmitter is activated from the A10-TX Remote
App.
• Sleep
Lock Menu Activates a button lock to prevent unintentional
changes to menu selections.
• Unlock
• Lock
Set Time / Date Sets the time and date of the realtime clock.
Format Card Deletes all les and data present on the inserted
microSD card.
OK - begins formatting process.
Restore The restore function allows the user to reset the
A10-TX to the factory default settings.
Info Shows numerous attributes of the transmitter. • Serial Number
• Firmware Revision
• Frequency Band
Update (Firmware) Updates the rmware of the transmitter using a
rmware .PRG le on the microSD card.

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A10-TX-US User Guide
Basic Operation
Frequency Selection
The A10 Digital Wireless System available in the operates in the UHF frequency band from 470
to 608 MHz. There are two models of the A10-TX-US transmitter to cover this frequency range.
Multiple A10 Digital Wireless systems can be used simultaneously on nearby adjacent
frequencies without worry of intermodulation interference since the A10 Digital Wireless System
and its digital RF transmission is inherently immune to intermodulation. Systems can be used
together when separated by at least 400 kHz. Use the scan tool on the A10-RX receiver to search
for available frequencies.
ªWhen using A10 Digital Wireless systems in conjunction with analogue RF systems, an
intermodulation plan needs to be addressed for analogue receivers.
Channel, Sub Channel, Frequency
To simplify frequency selection, frequencies are divided into channels and sub channels.
• Channel - corresponds to broadcast television channels used in geographic region.
• Sub Channel - channels are divided in 400 kHz increments called sub channels to speed up
frequency selection. The number of sub channels depends on the channel mapping selected.
• Tune - specic frequencies within the transmitter’s tuning range can be selected in 25 kHz
increments.
To change TV channels, use the Left button to highlight the TV
Channel. Press the centre Menu button to select the TV channel.
Select the sub channel until the desired sub-channel is selected.
See the Frequency Tables in this guide for a complete list of
frequencies corresponding to the channel and sub channel selections.
Audio Input and Control
The A10-TX-US input accepts a wide range of audio input types, including lavalier microphones,
balanced microphones, and balanced and unbalanced line level signals. 12 V and 48 V phantom
power is available for balanced microphones. The Selection Menu oers options for audio level
control, input type, limiters, and low cut lter.
Lavalier Microphones
Unbalanced lavalier microphones wired in two-wire mode, are directly compatible with the
A10-TX-US input. When connected, the A10-TX-US auto-detects the presence of a lavalier
microphone.
Balanced Microphones with Phantom
Balanced microphones, including phantom powered shotgun microphones, can be connected
to the A10-TX-US. 12 V and 48 V phantom power are available for microphones requiring
it. For microphones that can properly operate on 12 V phantom, such as the Schoeps CMIT,
select 12 V phantom to signicantly increase battery runtime.
Line-Level Sources
Wireless systems are often used as “camera hop” systems. For most camera hop applications
the output of a eld mixer is connected to a wireless transmitter. The wireless receiver output
is connected to the camera input. The line level input selection simplies using the A10

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A10-TX-US User Guide
System as a camera hop. Select Line in the Selection Menu to accept balanced or unbalanced
line level inputs.
ªTo connect balanced microphone or line level sources to the A10-TX-US a cable wired as
described in the specications or the AC-BALXLR cable is required. This connects the shell
of the LEMO connector to pin-1 of an XLR connector.
Audio Level Control
Input levels are controlled from the Audio Gain option in the Selection Menu. The gain range
available is source-dependent as follows:
• Lavalier setting: 0 dB to 40 dB, 1 dB increments
• Line setting: -10 to 16 dB, 1 dB increments
• Mic setting (with 20 dB pad): 16 to 40 dB, 1 dB increments
• Mic setting (with no pad): 36 to 60 dB, 1 dB increments
Set input levels so that the limiter is active only on the strongest peaks.
Antenna
The SMA antenna connector is used to mount the included 1/4-wave whip antenna. The use of
any other type is forbidden.
For best operation and transmission power with the included 1/4-wave antenna keep it in the free
eld. If worn on a body keep the antenna away from direct contact with the wearer’s body.
Recording
On the A10-TX-US, the record feature is only available for line and mic-level operations. It is
intended for wireless boom and remote microphone locations that do not require a two-wire
lavalier. When the A10-TX-US auto-detects the presence of a lavalier microphone, recording is
disabled.
The A10-TX-US incorporates a data recorder that stores encoded digital waveform and timecode
data in proprietary, data-compressed binary .mic les.
Files recorded on the A10-TX-US are not sound les and require conversion using Audio Ltd’s
Mic2Wav application. (For more information, see “File Conversion .MIC to .WAV”). After
conversion, a usable 48 kHz digital audio WAV le is made. Files recorded in the A10-TX-US
are approximately 1/3 the size of WAV les generated from corresponding .mic les, saving
valuable space on the microSD card. Files have a maximum duration of six hours. After six hours
the le is automatically split into another recording. Resulting WAV les are sample accurate
across le splits.
To begin recording on the A10-TX-US:
1. Ensure Menu > Audio Setup > Lav/Mic/Line is set to either Mic or Line options.
2. Select Menu > Record/TC > Record.
Recording can also be initiated from the A10-TX Remote App. The default le name of the
.mic le is the serial number of the A10 transmitter; however, the le name may be renamed
via the A10-TX Remote app. For more information, see Remote Control.
A Record “dot” indicator ashes in the display to show that the A10-TX-US is recording. This
indicator is also shown on the A10-RX, when paired with the A10-TX-US, in the TX Data
screen.

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A10-TX-US User Guide
File Storage
Proprietary .mic les generated by the A10-TX-US are stored on FAT32-formatted microSD
cards. The microSD card slot is located in the battery compartment and is accessed by removing
the battery nearest the display.
If no microSD card is inserted in the unit, a ‘No card detected’ message is indicated.
New cards, or cards with material that can be overwritten, can be formatted in the A10-TX-US.
ªFormatting deletes all existing recordings present on the card.
There is no provision to manage les from the A10-TX-US. File management, including le
renaming and individual le deletion, is done when the microSD card is mounted to a computer
via a card reader.
File Conversion .MIC to .WAV
The .mic les generated directly on the A10-TX-US are not usable until converted. Audio Ltd.
provides a free Mic2Wav conversion utility, available for download from the Audio Ltd. website:
www.audioltd.com. This utility—available for Mac or Windows operating systems—converts
.mic les to usable Broadcast WAV les.
Timecode and Time-of-Day Clocks
The A10-TX-US includes high-precision internal clocks to maintain time-of-day/date and
SMPTE timecode. These clocks run continuously when AA batteries are in the unit and draw
negligible current (less than 1 uA). The A10-TX-US design incorporates a supercapacitor to
power the time-of-day clock for several days in the absence of batteries. The supercapacitor
reaches full charge when batteries have been in the unit for ve minutes.
Time-of-Day Clock
The time and date clock holds time and date for les recorded on the A10-TX-US, and can be
used for the Time of Day timecode value.
To set time and date:
1. Enter the Selection Menu option real time clock. (Menu > System > Set Time/Date)
2. Use the center Menu button to move between year, month, day, hours, and minutes. Use
the Left and Right buttons to change the values.
3. Press the center Menu button to select the Return arrow and view current values. Press
again to exit.
External LTC Jamming
External LTC timecode can be applied to the A10-TX-US to synchronize its internal timecode
clock. Synchronization of timecode clocks is called “jam syncing”. To jam the A10-TX-US
timecode clock, navigate to Menu > Record/TC > Timecode in the Selection menu. Connect
an LTC timecode source to the 3-pin LEMO™input connector using either the AC-TCLEMO
or AC-TCBNC-IN cables. The A10-TX-US will jam its timecode clock from the incoming
timecode signal.
ªWhile in the Timecode menu, RF transmission and recording are deactivated on the
A10-TX-US.
The timecode clock remains accurate when the transmitter is powered or in standby mode.
When the unit is powered down accurate timecode is held for six hours. After six hours the
timecode clock is reset to its default value.

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A10-TX-US User Guide
Timecode Output
The transmitter’s 3-pin LEMO connector also functions as a timecode output connection. In
the Selection menu navigate to Menu > Record/TC > Timecode. While in this screen, time-
code can be sent out of the A10-TX-US using the AC-TCLEMO or AC-TCBNC-OUT cables.
Upon exiting the Timecode screen, the 3-pin LEMO reverts back to the selected lavalier,
microphone, or line input. RF transmission is reactivated, and recording is available for mic or
line inputs.
Remote Control
The A10-TX-US can be remotely controlled from an Android or iOS device running the A10-TX
Remote app. The app is available as a free download from the Google Play store and iOS App
store, respectively.
The app appears dierently depending on the audio source used with the transmitter. When the
A10-TX-US transmitter is connected to line or mic-level sources, with the A10-TX Remote app,
you can:
1 - Change the transmitter’s name; it is set to
the transmitter’s serial number by default.
2 - Monitor Sleep status, Battery status,
Bluetooth signal strength and Record status
3 - Turn Sleep mode On/O
4 - Start/Stop recording at the transmitter
5 - Adjust Gain
6 - Set the low-cut lter
7 - Adjust RF Power
8 - Change TV Ch, Sub Ch and Frequency
1
23
8
5
6
4
7
1
2
The recording features are unavailable on the A10-TX Remote app when using lavaliers, as
shown in the following images.

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A10-TX-US User Guide
1
23
7
4
5
6
1
2
When the A10-TX-US transmitter is connected to a lavalier, with the A10-TX Remote app, you
can:
1 - Change the transmitter’s name; it is set to
the transmitter’s serial number by default.
2 - Monitor Sleep status, Battery status, and
Bluetooth®signal strength
3 - Turn Sleep mode On/O
4 - Adjust Gain
5 - Set the low-cut lter
6 - Adjust RF Power
7 - Change TV Ch, Sub Ch and Frequency
Touch the unit name (left screen) to access more information (image on right) about the
transmitter. Touch the Circle-I icon to send identication signal to the transmitter.
ªThe Bluetooth operational range is very short. Maintain close proximity to the transmitter
for reliable connection.

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A10-TX-US User Guide
Firmware Updates
Audio Ltd. issues new rmware for the A10-TX-US transmitter to change and introduce new
features to the unit. Make certain to register your Audio Ltd. product at the Audio Ltd. website to
receive rmware update notications.
To update rmware:
1. Download the new rmware update le from the Audio Ltd. website and copy the le onto
an approved microSD card that has been formatted in the A10-TX-US.
2. Insert the microSD card in the unit.
3. Insert fresh AA batteries in the unit.
4. Enter the System menu and choose Update. The unit will indicate the revision of rmare to
update.
5. Conrm that you want to update.
6. Verify the revision of rmware on the unit.
Specications
A10 U.S. Digital Wireless
System Frequency Range
470–608 MHz
Transmitter Switching
Bandwidth
U.S. Only Models
A10-TX-AU (470–548 MHz)
A10-TX-BU (518–608 MHz)
Modulation Mode Audio Ltd. proprietary digital RF modulation
Digital Audio Codec Audio Ltd. proprietary, high-performance digital encoding algorithm
Audio Frequency Response 20 Hz–20 kHz
RF Output Power 10 mW, 20 mW, 50 mW, selectable
Audio Gain Control Lavalier setting: 0 dB to +40 dB, 1 dB increments
Line setting: -10 to 16 dB, 1 dB increments
Mic setting (w/ 20 dB pad): 16 to 40 dB, 1 dB increments
Mic setting (w/ no pad): 36 to 60 dB, 1 dB increments
Input Gain
Input Type
Input Impedance
(ohms)
Input Clipping Level
(minimum gain)
Lav 6.8k +6 dBu
Bal Mic - plus P48 and P12 2.5k +10 dBu (20 dB pad)
Bal Line 3k +24 dBu
Low Frequency Cut O, 40 Hz, 60 Hz, 80 Hz, 100 Hz, 200 Hz, user selectable
Input Limiter Analog, (pre-A/D converter)
Input Type Microphone or line level, balanced or unbalanced
Bias and Phantom Power 5 V Bias, 12 V or 48 V phantom power
Menu and Controls OLED menu display, 3 button navigation
Recording File Format Audio Ltd. proprietary .mic data le, requires conversion to WAV le
microSD Card microSD, microSDHC, microSDXC
Timecode Clock 0.2 ppm accuracy, holds accurate clock for 6 hours without power
Privacy User settable 4-digit PIN, Audio Ltd. proprietary
Powering 2 x 1.5V LR6 AA size, lithium, NiMH, or alkaline
Operating Temperature
Range
-10 °C to +55 °C
Weight and Dimensions 104 g, 83 x 64 x 18 mm

- 16 -
A10-TX-US User Guide
Input Connector Wiring Diagram
The A10-TX-US LEMO input connector accepts numerous input types. Select the input type in
the Selection Menu before connecting an audio source.
LEMO Connection
Input Type pin-1 pin-2 pin-3 shell
Two-Wire Lavalier Microphone shield open audio/bias shield or open
Three-Wire Lavalier Microphone not compatible
Balanced Microphone XLR pin-3 XLR pin-2 XLR pin-1 XLR pin-1, shell optional
Balanced Line-Level XLR pin-3 XLR pin-2 XLR pin-1 XLR pin-1, shell optional
Unbalanced Microphone earth signal earth earth
Unbalanced Line-Level earth signal earth earth
ªPhantom power can be activated only when the shell of the LEMO-3 is connected to pin-3 of
the LEMO-3 connector.
Battery Runtime Chart
This section’s chart shows approximate battery runtime in minutes based on the listed operation.
Operation
Battery Type
NiMH (2450 mAHr) Alkaline Lithium (Energizer Ultimate)
10 mW (RF Power Low) 8 hr 12 min 4 hr 7 min 12 hr 18 min
20 mW (RF Power Med) 7 hr 29 min 3 hr 56 min 11 hr 31 min
50 mW (RF Power High) 4 hr 33 min 2 hr 21 min 7 hr 57 min
50 mW, 48 V 3 hr 29 min 1 hr 33 min 6 hr 20 min
ªThe 48 V tests were run with a Schoeps CMIT Mini. Other settings used for tests to compile
the chart are: Low Cut O, Limiter On, 40 dB gain (for 48 V)/30 dB gain (for Lavalier),
freshly formatted 8G card, Bluetooth On, Blue LED On, and Brightness set to 5.

- 17 -
A10-TX-US User Guide
Certications
FCC Conformity
The A10-TX-US transmitter complies with the following requirements:
FCC (Federal Communications Commission) Part 74
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.
Changes or modication not expressly approved.
A10-TX-US frequency ranges supplied for use in USA:
• 470.2–547.8 MHz
• 518.2–607.4 MHz
ªFrequency range 608–614 MHz is forbidden for use in US.
ªWarning! Any modications or changes made to this device, unless explicitly approved by
Audio Ltd. may invalidate the authorisation of this device. Operation of an unauthorised
device is prohibited under Section 302 of the Communications act of 1934, as amended,
and Subpart 1 of Part 2 of Chapter 47 of the Code of Federal Regulations.
Output power is conducted average. This device is certied for portable use.
Declaration of Conformity
The Declaration of Conformity documentation is provide online at: http://audioltd.com/doc/.
Before putting the products into operation, please observe the respective country-specic
regulations.
Minimize RF Exposure
To avoid the possibility of exceeding the FCC RF exposure limits, body-worn operations are
restricted to belt-clips, holsters or similar accessories that have no metallic component in the
assembly and which provide at least 7mm separations between the device and the user’s body.

- 18 -
A10-TX-US User Guide
Frequency Tables
The A10-TX-US oers preselected frequencies based on channels and sub channels.
X Frequencies (6 MHz Per TV Channel)
The chart below shows all frequencies available for the A10-TX-US transmitter.
Sub Channel
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Channel
14 470.2 470.6 471 471.4 471.8 472.2 472.6 473 473.4 473.8 474.2 474.6 475 475.4 475.8
15 476.2 476.6 477 477.4 477.8 478.2 478.6 479 479.4 479.8 480.2 480.6 481 481.4 481.8
16 482.2 482.6 483 483.4 483.8 484.2 484.6 485 485.4 485.8 486.2 486.6 487 487.4 487.8
17 488.2 488.6 489 489.4 489.8 490.2 490.6 491 491.4 491.8 492.2 492.6 493 493.4 493.8
18 494.2 494.6 495 495.4 495.8 496.2 496.6 497 497.4 497.8 498.2 498.6 499 499.4 499.8
19 500.2 500.6 501 501.4 501.8 502.2 502.6 503 503.4 503.8 504.2 504.6 505 505.4 505.8
20 506.2 506.6 507 507.4 507.8 508.2 508.6 509 509.4 509.8 510.2 510.6 511 511.4 511.8
21 512.2 512.6 513 513.4 513.8 514.2 514.6 515 515.4 515.8 516.2 516.6 517 517.4 517.8
22 518.2 518.6 519 519.4 519.8 520.2 520.6 521 521.4 521.8 522.2 522.6 523 523.4 523.8
23 524.2 524.6 525 525.4 525.8 526.2 526.6 527 527.4 527.8 528.2 528.6 529 529.4 529.8
24 530.2 530.6 531 531.4 531.8 532.2 532.6 533 533.4 533.8 534.2 534.6 535 535.4 535.8
25 536.2 536.6 537 537.4 537.8 538.2 538.6 539 539.4 539.8 540.2 540.6 541 541.4 541.8
26 542.2 542.6 543 543.4 543.8 544.2 544.6 545 545.4 545.8 546.2 546.6 547 547.4 547.8
27 548.2 548.6 549 549.4 549.8 550.2 550.6 551 551.4 551.8 552.2 552.6 553 553.4 553.8
28 554.2 554.6 555 555.4 555.8 556.2 556.6 557 557.4 557.8 558.2 558.6 559 559.4 559.8
29 560.2 560.6 561 561.4 561.8 562.2 562.6 563 563.4 563.8 564.2 564.6 565 565.4 565.8
30 566.2 566.6 567 567.4 567.8 568.2 568.6 569 569.4 569.8 570.2 570.6 571 571.4 571.8
31 572.2 572.6 573 573.4 573.8 574.2 574.6 575 575.4 575.8 576.2 576.6 577 577.4 577.8
32 578.2 578.6 579 579.4 579.8 580.2 580.6 581 581.4 581.8 582.2 582.6 583 583.4 583.8
33 584.2 584.6 585 585.4 585.8 586.2 586.6 587 587.4 587.8 588.2 588.6 589 589.4 589.8
34 590.2 590.6 591 591.4 591.8 592.2 592.6 593 593.4 593.8 594.2 594.6 595 595.4 595.8
35 596.2 596.6 597 597.4 597.8 598.2 598.6 599 599.4 599.8 600.2 600.6 601 601.4 601.8
36 602.2 602.6 603 603.4 603.8 604.2 604.6 605 605.4 605.8 606.2 606.6 607 607.4 607.8
37 608.2 608.6 609 609.4 609.8 610.2 610.6 611 611.4 611.8 612.2 612.6 613 613.4 613.8
38 614.2 614.6 615 615.4 615.8 616.2 616.6 617 617.4 617.8 618.2 618.6 619 619.4 619.8
39 620.2 620.6 621 621.4 621.8 622.2 622.6 623 623.4 623.8 624.2 624.6 625 625.4 625.8
40 626.2 626.6 627 627.4 627.8 628.2 628.6 629 629.4 629.8 630.2 630.6 631 631.4 631.8
41 632.2 632.6 633 633.4 633.8 634.2 634.6 635 635.4 635.8 636.2 636.6 637 637.4 637.8
42 638.2 638.6 639 639.4 639.8 640.2 640.6 641 641.4 641.8 642.2 642.6 643 643.4 643.8
43 644.2 644.6 645 645.4 645.8 646.2 646.6 647 647.4 647.8 648.2 648.6 649 649.4 649.8
44 650.2 650.6 651 651.4 651.8 652.2 652.6 653 653.4 653.8 654.2 654.6 655 655.4 655.8
45 656.2 656.6 657 657.4 657.8 658.2 658.6 659 659.4 659.8 660.2 660.6 661 661.4 661.8
46 662.2 662.6 663 663.4 663.8 664.2 664.6 665 665.4 665.8 666.2 666.6 667 667.4 667.8
47 668.2 668.6 669 669.4 669.8 670.2 670.6 671 671.4 671.8 672.2 672.6 673 673.4 673.8
48 674.2 674.6 675 675.4 675.8 676.2 676.6 677 677.4 677.8 678.2 678.6 679 679.4 679.8
49 680.2 680.6 681 681.4 681.8 682.2 682.6 683 683.4 683.8 684.2 684.6 685 685.4 685.8
50 686.2 686.6 687 687.4 687.8 688.2 688.6 689 689.4 689.8 690.2 690.6 691 691.4 691.8
51 692.2 692.6 693 693.4 693.8 694.2 694.6 695 695.4 695.8 696.2 696.6 697 697.4 697.8

- 19 -
A10-TX-US User Guide
Y Frequencies (7 MHz Per TV Channel)
Sub Channels
1234567891011 12 13 14 15 16 17
Channels
22 485.3 485.7 486.1 486.5 486.9 487.3 487.7 488.1 488.5 488.9 489.3 489.7 490.1 490.5 490.9 491.3 491.7
23 492.3 492.7 493.1 493.5 493.9 494.3 494.7 495.1 495.5 495.9 496.3 496.7 497.1 497.5 497.9 498.3 498.7
24 499.3 499.7 500.1 500.5 500.9 501.3 501.7 502.1 502.5 502.9 503.3 503.7 504.1 504.5 504.9 505.3 505.7
25 506.3 506.7 507.1 507.5 507.9 508.3 508.7 509.1 509.5 509.9 510.3 510.7 511.1 511.5 511.9 512.3 512.7
26 513.3 513.7 514.1 514.5 514.9 515.3 515.7 516.1 516.5 516.9 517.3 517.7 518.1 518.5 518.9 519.3 519.7
27 520.3 520.7 521.1 521.5 521.9 522.3 522.7 523.1 523.5 523.9 524.3 524.7 525.1 525.5 525.9 526.3 526.7
28 527.3 527.7 528.1 528.5 528.9 529.3 529.7 530.1 530.5 530.9 531.3 531.7 532.1 532.5 532.9 533.3 533.7
29 534.3 534.7 535.1 535.5 535.9 536.3 536.7 537.1 537.5 537.9 538.3 538.7 539.1 539.5 539.9 540.3 540.7
30 541.3 541.7 542.1 542.5 542.9 543.3 543.7 544.1 544.5 544.9 545.3 545.7 546.1 546.5 546.9 547.3 547.7
31 548.3 548.7 549.1 549.5 549.9 550.3 550.7 551.1 551.5 551.9 552.3 552.7 553.1 553.5 553.9 554.3 554.7
32 555.3 555.7 556.1 556.5 556.9 557.3 557.7 558.1 558.5 558.9 559.3 559.7 560.1 560.5 560.9 561.3 561.7
33 562.3 562.7 563.1 563.5 563.9 564.3 564.7 565.1 565.5 565.9 566.3 566.7 567.1 567.5 567.9 568.3 568.7
34 569.3 569.7 570.1 570.5 570.9 571.3 571.7 572.1 572.5 572.9 573.3 573.7 574.1 574.5 574.9 575.3 575.7
35 576.3 576.7 577.1 577.5 577.9 578.3 578.7 579.1 579.5 579.9 580.3 580.7 581.1 581.5 581.9 582.3 582.7
36 583.3 583.7 584.1 584.5 584.9 585.3 585.7 586.1 586.5 586.9 587.3 587.7 588.1 588.5 588.9 589.3 589.7
37 590.3 590.7 591.1 591.5 591.9 592.3 592.7 593.1 593.5 593.9 594.3 594.7 595.1 595.5 595.9 596.3 596.7
38 597.3 597.7 598.1 598.5 598.9 599.3 599.7 600.1 600.5 600.9 601.3 601.7 602.1 602.5 602.9 603.3 603.7
39 604.3 604.7 605.1 605.5 605.9 606.3 606.7 607.1 607.5 607.9 608.3 608.7 609.1 609.5 609.9 610.3 610.7
40 611.3 611.7 612.1 612.5 612.9 613.3 613.7 614.1 614.5 614.9 615.3 615.7 616.1 616.5 616.9 617.3 617.7
41 618.3 618.7 619.1 619.5 619.9 620.3 620.7 621.1 621.5 621.9 622.3 622.7 623.1 623.5 623.9 624.3 624.7
42 625.3 625.7 626.1 626.5 626.9 627.3 627.7 628.1 628.5 628.9 629.3 629.7 630.1 630.5 630.9 631.3 631.7
43 632.3 632.7 633.1 633.5 633.9 634.3 634.7 635.1 635.5 635.9 636.3 636.7 637.1 637.5 637.9 638.3 638.7
44 639.3 639.7 640.1 640.5 640.9 641.3 641.7 642.1 642.5 642.9 643.3 643.7 644.1 644.5 644.9 645.3 645.7
45 646.3 646.7 647.1 647.5 647.9 648.3 648.7 649.1 649.5 649.9 650.3 650.7 651.1 651.5 651.9 652.3 652.7
46 653.3 653.7 654.1 654.5 654.9 655.3 655.7 656.1 656.5 656.9 657.3 657.7 658.1 658.5 658.9 659.3 659.7
47 660.3 660.7 661.1 661.5 661.9 662.3 662.7 663.1 663.5 663.9 664.3 664.7 665.1 665.5 665.9 666.3 666.7
48 667.3 667.7 668.1 668.5 668.9 669.3 669.7 670.1 670.5 670.9 671.3 671.7 672.1 672.5 672.9 673.3 673.7
49 674.3 674.7 675.1 675.5 675.9 676.3 676.7 677.1 677.5 677.9 678.3 678.7 679.1 679.5 679.9 680.3 680.7
50 681.3 681.7 682.1 682.5 682.9 683.3 683.7 684.1 684.5 684.9 685.3 685.7 686.1 686.5 686.9 687.3 687.7
51 688.3 688.7 689.1 689.5 689.9 690.3 690.7 691.1 691.5 691.9 692.3 692.7 693.1 693.5 693.9 694.3 694.7

- 20 -
A10-TX-US User Guide
Z Frequencies (8 MHz Per TV Channel)
Sub Channels
1234567891011 12 13 14 15 16 17 18 19 20
Channels
21 470.2 470.6 471.0 471.4 471.8 472.2 472.6 473.0 473.4 473.8 474.2 474.6 475.0 475.4 475.8 476.2 476.6 477.0 477.4 477.8
22 478.2 478.6 479.0 479.4 479.8 480.2 480.6 481.0 481.4 481.8 482.2 482.6 483.0 483.4 483.8 484.2 484.6 485.0 485.4 485.8
23 486.2 486.6 487.0 487.4 487.8 488.2 488.6 489.0 489.4 489.8 490.2 490.6 491.0 491.4 491.8 492.2 492.6 493.0 493.4 493.8
24 494.2 494.6 495.0 495.4 495.8 496.2 496.6 497.0 497.4 497.8 498.2 498.6 499.0 499.4 499.8 500.2 500.6 501.0 501.4 501.8
25 502.2 502.6 503.0 503.4 503.8 504.2 504.6 505.0 505.4 505.8 506.2 506.6 507.0 507.4 507.8 508.2 508.6 509.0 509.4 509.8
26 510.2 510.6 511.0 511.4 511.8 512.2 512.6 513.0 513.4 513.8 514.2 514.6 515.0 515.4 515.8 516.2 516.6 517.0 517.4 517.8
27 518.2 518.6 519.0 519.4 519.8 520.2 520.6 521.0 521.4 521.8 522.2 522.6 523.0 523.4 523.8 524.2 524.6 525.0 525.4 525.8
28 526.2 526.6 527.0 527.4 527.8 528.2 528.6 529.0 529.4 529.8 530.2 530.6 531.0 531.4 531.8 532.2 532.6 533.0 533.4 533.8
29 534.2 534.6 535.0 535.4 535.8 536.2 536.6 537.0 537.4 537.8 538.2 538.6 539.0 539.4 539.8 540.2 540.6 541.0 541.4 541.8
30 542.2 542.6 543.0 543.4 543.8 544.2 544.6 545.0 545.4 545.8 546.2 546.6 547.0 547.4 547.8 548.2 548.6 549.0 549.4 549.8
31 550.2 550.6 551.0 551.4 551.8 552.2 552.6 553.0 553.4 553.8 554.2 554.6 555.0 555.4 555.8 556.2 556.6 557.0 557.4 557.8
32 558.2 558.6 559.0 559.4 559.8 560.2 560.6 561.0 561.4 561.8 562.2 562.6 563.0 563.4 563.8 564.2 564.6 565.0 565.4 565.8
33 566.2 566.6 567.0 567.4 567.8 568.2 568.6 569.0 569.4 569.8 570.2 570.6 571.0 571.4 571.8 572.2 572.6 573.0 573.4 573.8
34 574.2 574.6 575.0 575.4 575.8 576.2 576.6 577.0 577.4 577.8 578.2 578.6 579.0 579.4 579.8 580.2 580.6 581.0 581.4 581.8
35 582.2 582.6 583.0 583.4 583.8 584.2 584.6 585.0 585.4 585.8 586.2 586.6 587.0 587.4 587.8 588.2 588.6 589.0 589.4 589.8
36 590.2 590.6 591.0 591.4 591.8 592.2 592.6 593.0 593.4 593.8 594.2 594.6 595.0 595.4 595.8 596.2 596.6 597.0 597.4 597.8
37 598.2 598.6 599.0 599.4 599.8 600.2 600.6 601.0 601.4 601.8 602.2 602.6 603.0 603.4 603.8 604.2 604.6 605.0 605.4 605.8
38 606.2 606.6 607.0 607.4 607.8 608.2 608.6 609.0 609.4 609.8 610.2 610.6 611.0 611.4 611.8 612.2 612.6 613.0 613.4 613.8
39 614.2 614.6 615.0 615.4 615.8 616.2 616.6 617.0 617.4 617.8 618.2 618.6 619.0 619.4 619.8 620.2 620.6 621.0 621.4 621.8
40 622.2 622.6 623.0 623.4 623.8 624.2 624.6 625.0 625.4 625.8 626.2 626.6 627.0 627.4 627.8 628.2 628.6 629.0 629.4 629.8
41 630.2 630.6 631.0 631.4 631.8 632.2 632.6 633.0 633.4 633.8 634.2 634.6 635.0 635.4 635.8 636.2 636.6 637.0 637.4 637.8
42 638.2 638.6 639.0 639.4 639.8 640.2 640.6 641.0 641.4 641.8 642.2 642.6 643.0 643.4 643.8 644.2 644.6 645.0 645.4 645.8
43 646.2 646.6 647.0 647.4 647.8 648.2 648.6 649.0 649.4 649.8 650.2 650.6 651.0 651.4 651.8 652.2 652.6 653.0 653.4 653.8
44 654.2 654.6 655.0 655.4 655.8 656.2 656.6 657.0 657.4 657.8 658.2 658.6 659.0 659.4 659.8 660.2 660.6 661.0 661.4 661.8
45 662.2 662.6 663.0 663.4 663.8 664.2 664.6 665.0 665.4 665.8 666.2 666.6 667.0 667.4 667.8 668.2 668.6 669.0 669.4 669.8
46 670.2 670.6 671.0 671.4 671.8 672.2 672.6 673.0 673.4 673.8 674.2 674.6 675.0 675.4 675.8 676.2 676.6 677.0 677.4 677.8
47 678.2 678.6 679.0 679.4 679.8 680.2 680.6 681.0 681.4 681.8 682.2 682.6 683.0 683.4 683.8 684.2 684.6 685.0 685.4 685.8
48 686.2 686.6 687.0 687.4 687.8 688.2 688.6 689.0 689.4 689.8 690.2 690.6 691.0 691.4 691.8 692.2 692.6 693.0 693.4 693.8
Channel Assignments by Region
Region AL Frequency Region
North America, South Korea, Taiwan, Philippines X
UK and Western Europe , Greenland, Asia, Africa Z
Australia and New Zealand Y
Japan X
Taiwan X
China X
For further information, contact Audio Ltd or your local distributor
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7 Century Court, Tolpits Lane, Watford WD18 9RS, UK | inf[email protected]