GME TX3120S User manual

Super compact 5 watt UHF CB radio
ScanSuite
faster, smarter scanning
™
5 YEAR WARRANTY
INSTRUCTION MANUAL

PAGE 2 INSTRUCTION MANUAL TX3120S
SUPPLIED WITH
TX3120S Radio DC Lead
Mounting Cradle Screw pack and Adaptor
Microphone Instruction Manual
Microphone clip
CONTENTS
SUPPLIED WITH...................................................2
INTRODUCTION ..................................................3
IMPORTANT INFORMATION CONCERNING UHF
CB RADIO ...........................................................3
POSSIBLE ISSUES.................................................3
EMERGENCY CHANNELS.....................................4
TELEMETRY CHANNELS.......................................4
FEATURES ...........................................................4
GENERAL OPERATION.........................................6
Front Panel Controls............................................6
Rear Panel...........................................................6
LCD Panel ...........................................................7
Microphone ........................................................7
ON/OFF Switch....................................................8
Volume ...............................................................8
Minimum Volume Setting (VMIN).........................8
Receive Audio Mute ............................................8
Selecting Channels..............................................8
Configuration Menu ............................................9
Flipping the Display...........................................11
Squelch.............................................................11
Signal Meter .....................................................12
Transmitting......................................................12
Time-out Timer ..................................................12
Backlighting......................................................12
Dynamic Volume Control (DVC) .........................14
Voice Scrambler.................................................14
Beep Tone Volume.............................................15
Silent Squelch Tail..............................................15
Disabling the Internal Speaker ...........................16
Repeaters and Duplex .......................................16
Priority Channel ................................................18
Scanning...........................................................18
Open Scan ........................................................19
Group Scan.......................................................21
Network Scan (Net-Scan)...................................22
CTCSS & DCS....................................................24
INSTALLATION ..................................................26
Fitting the Radio ...............................................27
Antenna Connection .........................................30
Microphone Connection ....................................31
WIRING ............................................................31
DC Power Connection .......................................31
Noise Suppression.............................................32
CTCSS TONE FREQUENCY CHART......................33
DCS CODE CHART.............................................34
UHF CB OPERATING FREQUENCIES ...................35
SPECIFICATIONS ...............................................36
SC WARRANTY AGAINST DEFECTS ....................38

TX3120S INSTRUCTION MANUAL PAGE 3
INTRODUCTION
Your GME TX3120S 80 channel radio is Australian
designed and built and is the most advanced UHF
Citizen Band radio available. It combines the very
latest in electronic hardware with the most up-to-
date computer aided design and manufacturing
techniques to produce an incredibly compact
mobile radio with outstanding specifications and
performance.
Your radio is designed for unobtrusive mounting
in modern vehicles. With its built-in loud speaker,
speaker microphone and extremely small size, it
can be mounted in almost any convenient location.
IMPORTANT INFORMATION
CONCERNING UHF CB RADIO
The use of the Citizen Band radio service is licensed
in Australia by the ACMA Radio communications
(Citizens Band Radio Stations) Class Licence and
in New Zealand by the Ministry of Economic
Development New Zealand (MED).
A General User Radio Licence for Citizens Band
radio and operation is subject to conditions
contained in those licences.
The class licence for users and equipment operating
in the CB/PRS 477 MHz band has been amended.
This radio meets the new 80 channel standard.
In simple terms the same amount of spectrum is
available; however, radio transceivers can now
operate in a narrower bandwidth and hence use
less spectrum. These radios are generally referred
to as narrowband or 12.5 kHz radios. By using
12.5 kHz channel spacing instead of 25 kHz,
the 40 channels originally allocated can now be
expanded to 80 channels thereby doubling the
channel capacity and relieving congestion in the
UHF CB/PRS band.
Original 40 channel wideband Radios will continue
to operate on the original 40 channels, however
they will not be able to converse on the newer
channels 41 – 80. The newer narrowband radios
will be able to converse with all older 40 channel
wideband radios on all channels 1 to 40 as well as
the newer channels allocated from 41 to 80.
The mixing of narrowband and wideband radios
in the same spectrum can cause some possible
operating issues of interference and varying levels
of received volume.
POSSIBLE ISSUES
When a new narrowband radio receives a
transmission from an older wideband radio the
speech may sound loud and distorted – simply
adjust your radio volume for best performance.
When an older wideband radio receives a signal
from a new narrowband radio, the speech may
sound quiet – simply adjust your radio volume for
best performance.
Depending on how close your receiving radio
is to another transmitting radio, there can be
interference from the transmitting radio if it is
using a channel adjacent to the channel you are
listening to. Simply try going up or down a few
channels from the currently selected channel.
The above situations are not a fault of the radio
but a symptom of operating wideband and
narrowband radios in the same bandwidth. This
possible interference will decrease over time as the
population of wideband radios ages and decreases.
Further information and updates are available
from the Australian Communications and Media
Authority (ACMA) at www.acma.gov.au and the
Ministry of Economic Development (MED), Radio
Spectrum Management at: www.rsm.govt.nz

PAGE 4 INSTRUCTION MANUAL TX3120S
EMERGENCY CHANNELS
The ACMA has allocated channels 5/35 for
emergency use only. Channel 5 is the primary
Simplex Emergency Channel. Where a Channel 5
repeater is available, you should select Duplex on
CH 5.
NOTE: Channel 35 is the input channel for
the Channel 5 repeater therefore Channel 35
should also not be used for anything other than
emergency transmissions.
TELEMETRY CHANNELS
ACMA regulations have allocated channels 22
and 23 for telemetry only applications and have
prohibited the transmission of speech on these
channels. Consequently your radio has a transmit
inhibit applied to channels 22 and 23.
In the event additional telemetry/telecommand
channels are approved by the ACMA, these
channels shall be added to those currently listed
where voice transmission is inhibited. Currently
transmissions on channels 61, 62 and 63 are also
inhibited and these channels are reserved for future
allocation.
FEATURES
TRANSMIT (TX)
Individually Programmable DUPLEX Function: User selectable for only those individual channels
in your area that have repeaters, leaving the others free for use as extra simplex channels.
RECEIVE (RX)
Silent Squelch Tail:Eliminates the Squelch noise burst normally audible when the Squelch closes
Signal Receive Indicator: Confirms that an incoming signal is being received
SCANNING AND MEMORY FUNCTIONS
Microprocessor Controlled Frequency Synthesiser: Allows user programmable control of
scanning, channel memories and selected feature options.
Programmable Scan Function
:Scans the selected UHF CB channels with Group, Open and Network
scan functions available.
Priority Channel: A user programmable Priority channel feature allows your working channel to be
instantly recalled at the press of a key
SIGNAL PROCESSING
Digital Signal Processing: Measures filters and compresses standard analogue audio signals and
converts them into digital format. Allows advanced RF and audio processing techniques to be applied
to maximise the radio’s performance..

TX3120S INSTRUCTION MANUAL PAGE 5
Advanced Signal Management: Identifies interference caused by strong local signals on adjacent
channels and prevents these from opening your Squelch. ASM also minimises distortion on reception by
fine tuning the receiver frequency to match that of the incoming signal.
Dynamic Volume Control: Automatically compensates for variations in received audio level to
provide a constant audio output level to the speaker.
PRIVACY FUNCTIONS
Voice Inversion Scrambler: When activated, scrambles your voice so that communications are only
intelligible to others using the same scrambler technology.
Inbuilt CTCSS & DCS: User selectable Continuous Tone Coded Squelch System and Digital Coded
Squelch system provides silent operation on individual channels.
PHYSICAL PROPERTIES
Over Voltage Protection: Special overvoltage detection circuitry protects the radio and warns of
excessive voltage conditions by flashing the display.
Rugged Construction: With die-cast chassis
Speaker Microphone: Improves receiver audio clarity in noisy environments by bringing the sound
closer to you.
USER CONTROLS AND INTERFACE
Full Spectrum Backlighting: User adjustable, totally customisable backlight settings to match the
vehicle’s dashboard lighting or driver’s preference.
Flip Feature: Unit can be mounted with the speaker facing upwards or downwards and the display
‘flipped over’ using a simple menu selection to allow viewing of the display from either mounting
orientation. Keys use symbols to provide readability in all installations.
High Contrast Liquid Crystal Display: Fully detailed LCD provides a visual indication of the selected
channel and all selected functions at a glance.
Rear Microphone Input: Facilitates ease of installation and operation across a wider range of
vehicles.
Digital Signal Strength Meter: Provides a numeric signal strength indication in numbers from 0 to
9+