User's Guide

A20-MINI User Guide
13
Setting Frequency
The A20-MINI transmits on frequencies ranging from 470
MHz–694 MHz. The frequencies available are determined by
your geographic location. See https://www.sounddevices.com
for further information regarding the available frequencies and
TV channel mapping in your area.
Pre-selected frequencies are available based on TV channels
and sub channels. Three sets of frequencies are available
based on either 6, 7, or 8 MHz channel bandwidth. The channel
bandwidth is based on the geographic region where the unit is
operating.
• 6 MHz per TV channel:
North America, South Korea, Philippines,
China, Taiwan, Japan
• 7 MHz per TV channel:
Australia and New Zealand
• 8 MHz per TV channel:
UK and Western Europe , Greenland, Asia, Africa
Touch the frequency display to change the frequency manu-
ally with numeric values in 25 kHz increments or touch the TV
channel to select from available TV channels and sub-channels.
When User Groups are active, the method of selecting frequen-
cy changes. See User Groups for more details.
Setting RF Power
RF power is the strength of the transmitting signal. The A20-
MINIoersthefollowingRFpowersettings.
• O-A20-MINIisonbutisnottransmitting.
• 2 mW
• 10 mW
• 20 mW
• 40 mW
RF power settings are based on your location as some legal
restrictions may apply. Touch “RF Power” and select from the
drop-down list.
Tuning A20-MINI and the Audio Ltd A10-RX
Signal transmitted by the A20-MINI transmitters are received
by the Audio Ltd A10-RX. Enter the frequency of the transmitter
you wish to receive on the A10-RX either by manually tuning the
number or using the TV channel and sub channel. Be sure to
properly set the A10-RX to the proper TV channel map for your
area when using the TV channel method. See Frequency Tables
for more information.
The A20-MINI uses a very advanced codec and RF transmission
scheme such that the audio gain, low-cut, and limiter are adjust-
ed at the receiver instead of transmitter.
Adjusting Audio of the A20-MINI Signal from the A10-RX
From the A10-RX, press the channel’s arrow button twice to
view the status of the tuned A20-MINI. Press the middle button
to enter the menu. From the menu select to adjust gain, limiter,
or low cut of the incoming A20-MINI transmitted signal. Gain is
adjustablefrom0to40dB.Limitercanbeturnedonoro.Low
cutcanbesettoO,40Hz,60Hz,80Hz,100Hz,or200Hz.
See the A10-RX User Guide for more details.
Recording WAV Files
TheA20-MINIrecords32-bitoatRF64WAVlesat48kHz
samplingrates.Recordingofaudiolesisautomaticallydonein
32-bitoatsothatsettinggaintoohighorlowisneveraprob-
lem.Learnmoreabout32-bitoatat:
https://www.sounddevices.com/category/support/tech-notes/
Recordings are started and stopped using the record and stop
buttons in the TX View.
ThelenameformatisTXName-YYMMDDHHMMSS.WAV.For
example, the TX name has been changed to “Barney” and a
recording is created on June 10, 2021 at 9:30 in the morning,
theresultingleisnamedBarney-210610093000.WAV.Allles
are recorded at root of the internal SSD (no folders).
RecordingwithA20-MINIPurchasedintheU.S.A.
Simultaneous Record and Transmit mode is not available on
A20-MINI units sold in the United States of America.
Record features of A20-MINI transmitters purchased in the U.S.A. are
only available when RF Power is set to Off.
Jamming Timecode
The A20-MINI jams timecode from an external LTC source via
USB. The timecode value and frame rate are taken from incom-
ing LTC source. If timecode has not been jammed, the A20-MINI
stampslesusing the time of day, derived from the mobile
device running SD-Remote.
Timecode values are held for up to four hours after power
down, and for one hour after the battery has been removed.
This allows for time to swap batteries without having to re-jam
timecode.
To jam timecode, connect a valid LTC source using one of the
optional accessories Sound Devices XL-TCU-LEMO or XL-TCU-
BNC to the USB-C port. Timecode is automatically jammed
once a valid LTC source is connected.
Afterasuccessfultimecodejam,theAudio/LTCLEDashes
blue on the 00 frame crossing. Timecode is output from the
USB-C using the Sound Devices XL-TCU-LEMO so that you can
verify the A20-MINI timecode is in sync with the LTC source.
The A20-MINI can also jam timecode while connected to the
optional XL-PowerStation via USB-C. See XL-PowerStation for
more details.