GME TX3100VP User manual

Super compact 5 watt UHF CB radio
5 YEAR WARRANTY
INSTRUCTION MANUAL

PAGE 2 INSTRUCTION MANUAL TX3100
INTRODUCTION .........................................................................3
IMPORTANT INFORMATION........................................................3
TELEMETRY CHANNELS..............................................................4
FEATURES..................................................................................5
GENERAL OPERATION................................................................6
Unique Flip Feature.............................................................7
Power ................................................................................7
Volume ..............................................................................7
Selecting Channels .............................................................7
Transmitting .......................................................................7
Squelch Control..................................................................8
Squelch Sensitivity ..............................................................8
Backlight............................................................................9
Duplex Operation ...............................................................9
Dynamic Volume Control.....................................................9
Adjusting the Beep Tone Level ..........................................11
CTCSS & DCS...........................................................................11
Selecting the CTCSS or DCS Tone ......................................12
Enabling CTSS/DCS on a Channel......................................13
Disabling CTCSS/DCS on a Channel ..................................13
Monitoring the Channel....................................................13
SCANNING ..............................................................................14
Programming Scan Channels ............................................14
Using Scan...............................................................................14
Skipping Over Busy Channels While Scanning ...........................15
Transmitting While Scanning.....................................................15
INSTALLATION .........................................................................15
Antenna Installation .........................................................16
Noise Suppression ............................................................16
DC Power Connection.......................................................19
High Voltage Detection .....................................................20
Antenna Connection.........................................................20
UHF CB OPERATING FREQUENCIES ..........................................21
CTCSS TONE FREQUENCY CHART.............................................22
DCS TONE CHART.....................................................................23
SPECIFICATIONS ......................................................................24
SC CONTRACT WARRANTY AGAINST DEFECTS.........................26
CONTENTS
INTRODUCTION
The TX3100 is Australian designed and engineered to
produce an extremely compact mobile radio with outstanding
specifications and performance.
The TX3100, with its front mounted controls, is designed for
unobtrusive mounting in modern vehicles. Its innovative features
include a built-in loud speaker housed within an extremely
compact case.

TX3100 INSTRUCTION MANUAL PAGE 3
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.
ACCESSORIES SUPPLIED
Main Radio Unit
Mounting Bracket
Instruction Manual
Microphone
Microphone Clip
DC Lead
Screw Pack
Supplementary GME
model label
If any items are missing or
damaged, please contact your
retailer or place of purchase .

PAGE 4 INSTRUCTION MANUAL TX3100
The TX3100 uses advanced DSP processing to minimise the
possibility of interference on adjacent channels and the need to
adjust your volume control to compensate for wide/narrow
band reception.
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
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 the TX3100 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.
SAFETY MOUNTING GUIDELINES
FOR PLUG ‘N’ PLAY
The TX3100 Plug ‘n’ Play (TX3100PNP) is supplied with a suction
mount bracket - Part No: MB043, designed to hold the TX3100
UHF CB radio so that it can be remotely mounted onto the
windscreen within the vehicle or alternatively on a flat surface
where the suction base can take hold.
In order to ensure driver safety when using the TX3100
Plug ‘n’ Play, GME provides the following recommendations
and guidelines;
• The product should not be mounted in a way that blocks the
driver’s field of vision of the road.
• When mounting on the driver’s side of the front windscreen,
it is recommended the suction be placed as close as possible
to the corner of the windscreen to minimise interruption to the
driver’s field of vision.
• If fitted elsewhere on the windscreen it should be low down to
ensure the driver’s field of vision is not blocked.
•If it is not possible or practical due to the design of the dash or
the driver’s seating position, the unit may be placed low down
in the centre of the windscreen.
• The unit must not be located in a position that could
potentially cause injury during a crash – such as a head strike
to the unit. Airbag deployment should also be considered
when mounting the unit.
• Mounting the unit high up on any part of the windscreen is not
recommended as it may cause an interruption to the driver’s

TX3100 INSTRUCTION MANUAL PAGE 5
field of vision or interfere with rear view mirrors and sun
visors. It may also result in the DC power lead trailing in the
field of vision.
• Deciding on the location of the unit should also factor where
power leads may need to run to avoid the possibility of them
interfering with or becoming entangled in vehicle controls.
• Covering or restricting access to dash instruments and controls
is not recommended.
The responsibility of deciding the location of where the unit is
mounted rests entirely with the end-user and should be carefully
considered to ensure compliance with any state or federal laws.
FEATURES
•Microprocessor Controlled Frequency Synthesiser:
Allows user programmable control of scanning, channel
memories and selected feature options.
•
Advanced Signal Management (ASM): 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 (DVC): Automatically
compensates for variations in received audio level resulting in
a constant audio output level to the speaker.
•Programmable Scan Function: Scans the programmable
UHF CB channels.
•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.
•High Contrast Liquid Crystal Display: Fully detailed LCD
provides a visual indication of the selected channel and all
selected functions at a glance. Backlit for viewing at night.
•Flip Feature: Unit can be mounted with the speaker facing
upwards or downwards and the display ‘flipped over’ using
a simple key-press sequence to allow viewing of the display
from either mounting orientation. Keys use symbols to provide
readability in all installations.
•Compact Size: Fits into the smallest locations allowing
installations in even the most ‘space challenged’
environments.
•CTCSS & DCS: A built-in Continuous Tone Coded Squelch
and Digital Coded Squelch System option provides quiet
channel operation.
•Overvoltage Protection: Special overvoltage detection
circuitry protects the radio and warns of excessive voltage
conditions by flashing the display.
•Surface Mount Technology: The very latest surface mount
component types, design and assembly techniques and quality
control procedures are used to ensure the highest performance
and reliability.
•Designed and Engineered in Australia

PAGE 6 INSTRUCTION MANUAL TX3100
GENERAL OPERATION
S
TX3100
S
BASIC CONTROLS
LCD
Microphone Socket
Transmit
Squelch Icon
Scan Icon
Channel Display
Silent (CTCSS) Icon
DCS Icon
Power
Scan Squelch
LCD
Volume
Channel

TX3100 INSTRUCTION MANUAL PAGE 7
MICROPHONE
UNIQUE FLIP FEATURE
The TX3100 has a unique Display Flip function that allows the
unit to be installed upside down, if required, and the display read
from either orientation.
For more information on this feature please refer to Flipping the
Display under Installation on page 18.
POWER
To turn the TX3100 ON, briefly press the key.
To turn the TX3100 OFF, press and hold the key.
VOLUME
Press the or keys to increase or decrease the volume. The
radio will beep with each key press and the display will flash
to indicate the volume setting is being displayed. The volume
level can be set from 00 (min) to 31 (max). The display will stop
flashing and will return to displaying the selected channel a few
seconds after the last volume adjustment.
NOTE: At the minimum volume setting there is still sufficient
volume to be heard in a quiet cabin environment.
SELECTING CHANNELS
Press the or keys to step upwards or step downwards
through the channels.
TRANSMITTING
To transmit, press the PTT button. Hold the microphone about
5-8 cm from your face and speak at a normal voice level. The
microphone is quite sensitive so it is not necessary to raise your
voice or shout. Release the PTT when you have finished talking.
IMPORTANT: Always listen to ensure the channel is free
before transmitting.
Push-To-Talk (PTT)

PAGE 8 INSTRUCTION MANUAL TX3100
SQUELCH CONTROL
Squelch control is used to eliminate the background noise when
there are no signals present. The TX3100 features a preset
Squelch system. The Squelch sensitivity has been factory set to
provide optimum performance in most environments, however
the sensitivity can be altered by the user if required to suit varying
environmental situations.
The Squelch can be opened or closed by pressing the key.
When the Squelch is open, the receiver’s background noise can
be heard and is displayed. When the Squelch is closed, the
receiver remains quiet when there are no signals present but an
incoming signal will override the squelch and be heard in
the speaker.
To open the Squelch
Briefly press the key. A low beep will be heard. If there are
no signals present you will hear the receiver’s background noise.
To close the Squelch
Briefly press the key again. A high beep will be heard and
the receiver will become quiet.
NOTE: If an incoming signal is very weak and is close to the
minimum squelch level, it may become broken or ‘chopped’ by
the squelch action. To prevent this, simply open the Squelch to
allow the signal to be heard clearly. Alternatively you can reduce
the Squelch sensitivity as described below.
SQUELCH SENSITIVITY
The sensitivity of the Squelch to incoming signals can be set to
suit your operating environment. For example, excessively noisy
environments may cause the squelch to open on local noise. The
TX3100 has nine (9) preset Squelch sensitivity settings.
To adjust the preset Squelch sensitivity
Press and hold the key while immediately pressing the
or keys. The icon will flash and the preset squelch level
will be displayed as -1 to -9 . The minimum squelch level of -1
is the most sensitive and will allow the squelch to open on very
weak signals. Setting the squelch to the maximum setting of -9
will require very strong signals to open the squelch. The default
setting is -3 which generally provides reliable squelch operation
for most applications.
NOTE: After pressing the key you should begin pressing
the or keys immediately (within 2 seconds) otherwise the
‘Silent’ mode may be activated. See ENABLING CTCSS/DCS
ON A CHANNEL on page 9.
Setting the Squelch sensitivity

TX3100 INSTRUCTION MANUAL PAGE 9
BACKLIGHT
When the radio is on, briefly press the key to cycle through the
brightness levels for the LCD and keypad lighting. There are 5 levels
of lighting from off to full brightness. Each key press increases the
brightness until maximum brightness is reached. The next key press
resets the brightness level to off and the cycle repeats.
DYNAMIC VOLUME CONTROL (DVC)
The modulation level of signals heard on the UHF CB band has
always varied considerably resulting in noticeable differences in
received audio volume between stations. Generally users have
compensated for this by adjusting the volume control for each
received signal. With the introduction of 80 channel narrowband
transmissions that use lower levels of modulation, the diversity in
received audio volume is likely to increase further.
The TX3100 is able to automatically compensate for these
variations in received audio level by utilising a Dynamic Volume
Control. This feature automatically compensates for variations in
received audio level resulting in a constant audio output level to
the speaker to greatly enhance the quality of the reception.
DUPLEX OPERATION
Duplex operation allows the radio to transmit on a different
frequency to that which it receives allowing operation through
repeater stations. Repeaters automatically re-transmit your signal
over a wider area, providing greatly increased range.
Duplex operation operates only on channels 1-8 and 41-48.
When duplex is selected on these channels, the radio receives on
that channel but actually transmits 30 channels higher.
Vehicle
Simplex/Duplex Range Comparison
Simplex
Repeater
operation
Channel 31
Channel 1
Repeater
Station
Channel 1
Channel 31
Vehicle
Off Very Low Low Medium High

PAGE 10 INSTRUCTION MANUAL TX3100
Channel Selected Receive Channel Transmit Channel
1 1 31
2 2 32
3 3 33
4 4 34
5* 5* 35*
6 6 36
7 7 37
8 8 38
41 41 71
42 42 72
43 43 73
44 44 74
45 45 75
46 46 76
47 47 77
48 48 78
* Emergency Channel only
The TX3100 allows you to select Duplex operation
individually on each channel.
To select Duplex on individual channels;
1. Select the required channel (1 – 8 or 41 – 48).
2. Press and hold the key and immediately press the
key. The ‘0’ in the channel number will change to ‘r’ if
channel 1 – 8 is selected to indicate that channel is now set
as a repeater channel. The ‘0’ in the channel will change to
’u’ to indicate the channel is now set as an upper repeater
channel, if channel 41 – 48 is selected.
Eg: Channel 2 will be displayed as ‘02’ when in simplex mode
but will change to ‘r2’ when duplex is activated on that channel.
Channel 42 will be displayed as ‘42’ when in simplex mode but
will change to ‘u2’ when duplex is activated on that channel.
Channel 2 Duplex (repeater)
Channel 42 Duplex (repeater)
Channel 2 Simplex

TX3100 INSTRUCTION MANUAL PAGE 11
NOTE: You must press the key immediately after pressing the
key otherwise the scan memory function will be activated.
See SCANNING on page 14.
ADJUSTING THE BEEP TONE LEVEL
The beep tones on your TX3100 are designed to provide audible
feedback whenever a key is pressed. If the beep tone level is too
loud or too soft for your operating environment you can adjust it
as follows:
1. Turn the TX3100 OFF.
2. Hold either the or key while turning the radio ON.
3. A number will flash on the display to indicate the current
beep tone level setting.
4. Within 3 seconds, press the or keys to increase or
decrease the beep tone level. The maximum level is 9 and the
minimum audible level is 1. To turn the beep tone off set the
level to 0.
5. To return the radio to normal operation, press any other key or
simply wait 3 seconds.
CTCSS & DCS
CTCSS (Continuous Tone Coded Squelch System) and DCS
(Digitally Coded Squelch) are Squelch quieting systems that
allow several groups of users to share the same channel without
disturbing each other. The system applies a continuous low-level
tone to your transmission and uses a matching tone decoder to
control your receiver’s Squelch. With CTCSS or DCS enabled, the
channel remains quiet to all incoming signals unless they carry
the correct tone. When a transmission with the correct tone is
received, the Squelch opens and remains open for as long as
the signal is present. When the transmission ends, the channel
becomes quiet again. Transmissions that do not use the correct
tone will not be heard.
There are two tone sets installed in your TX3100, compromising
50 CTCSS and 104 DCS user-selectable tones.
The TX3100 allows CTCSS or DCS to be enabled or disabled on
individual channels.
NOTE: The CTCSS/DCS tone you select will be used for all
CTCSS/DCS enabled channels in your radio.

PAGE 12 INSTRUCTION MANUAL TX3100
SELECTING THE CTCSS OR DCS TONE
Choosing which tone to use will probably be dependent on the
other radios you talk to. If you talk to others outside your group
who already use CTCSS or DCS tones you will need to select the
tone set that matches theirs. The TX3100 includes most of the
commonly used tone sets.
If the users you talk to don’t currently use CTCSS or DCS you can
make your own choice. There is no difference in performance
between the two tone sets.
NOTE: When selecting tones please refer to the CTCSS and
DCS Tone Charts on pages 22 – 23.
The CTCSS and DCS tones are stored in your radio in a sequential
table. The first table location is OFF. The next 50 locations are
CTCSS tones followed by 104 DCS tones.
OFF CTCSS 01 to CTCSS 50 DCS 01 to DCS 104
To select a tone
1. Switch the TX3100 off.
2. Press and hold the key while switching the radio on.
‘S’ flashes and the channel
number displays the currently
selected tone. If OF is
displayed the tones are set
to OFF.
3. Press the or keys to select the required CTCSS tone.
The flashing ‘S’ indicates the
tones you are selecting are
CTCSS tones.
4. If you advance past CTCSS tone 50 the tone number resets to
01 and the symbol flashes indicating that you are now
selecting DCS tones. Continue
advancing through the tones
to select your required
DCS tone.
NOTE: Since the display does not have enough digits to display
DCS tones 100 - 104, these tones are displayed as A0 - A4.
5. Once the required CTCSS or DCS tone is selected, briefly press
the key to exit the tone setting mode. The selected tone
will now be used on any channels where the Silent mode
is enabled.
CTCSS Off
DCS Tone 104
CTCSS Tone 24
S
S
S

TX3100 INSTRUCTION MANUAL PAGE 13
ENABLING CTCSS/DCS ON A CHANNEL
Once a CTCSS/DCS tone has been selected, it can be enabled on
individual channels.
1. Press the or keys to select the required channel.
2. Press and hold the key. A high beep will be heard and
‘S’ will appear on the display. If a DCS tone is being used,
will also be displayed.
Your radio is now in ‘Silent’ mode and will remain muted on that
channel unless a signal containing your selected CTCSS/DCS tone
is received. Channels that do not have CTCSS/DCS enabled will
remain open to all signals.
You may activate CTCSS/DCS on as many channels as you wish
except channel 5 which is designated for emergency use.
NOTE: CTCSS/DCS may not work through some repeaters.
DISABLING CTCSS/DCS ON A CHANNEL
Repeat steps 1 and 2 above. A low beep will be heard and ‘S’
will disappear from the display.
NOTE: You will not be able to activate CTCSS/DCS on any
channel if the CTCSS/DCS tone is set to ‘OF’.
MONITORING THE CHANNEL
It is useful to be able to temporarily open your radio’s Squelch
to allow you to listen for signals from other CTCSS/DCS users
outside your group. Because their CTCSS/DCS tone is different
to yours, your Squelch would normally remain closed, preventing
you from hearing them. You can use the key to open
the Squelch and listen to the channel to check that it is clear
before transmitting. This will help prevent you from accidentally
transmitting over the top of others.
To monitor the channel
Briefly press the key. If there are no signals present, you will
hear the usual hiss of an empty channel. Press the key again
to restore the Squelch to its previous setting.

PAGE 14 INSTRUCTION MANUAL TX3100
SCANNING
The TX3100 has a SCAN function that allows a selection of user
programmable channels to be scanned for signals. Channels
are scanned at 20 channels per second. When a signal is found,
scanning will pause on that channel to allow the signal to be
heard, then resume scanning when the channel is clear again.
PROGRAMMING SCAN CHANNELS
Your TX3100 is supplied with all 80 UHF CB channels
programmed into the Scan memory. Any channels not needed,
can be removed if required.
To add or remove channels from the scan memory
1. Ensure that the radio is not already scanning. If it is, briefly
press the key to cancel the scan function.
2. Select the required channel by using the or keys
• If is visible on the display, the selected channel is
already in the scan memory.
• If is not visible, then the selected channel is not in
the memory.
• To add or remove the selected channel, press and hold the
key for a few seconds until a beep is heard.
3. Repeat step 2 to add or remove other channels in the
scan memory.
To start scanning
To begin scanning, briefly press the key. A high beep will
be heard, will flash on the display and the radio will
begin scanning.
NOTE: If there is only one channel programmed into the Scan
memory, a long low beep will be heard when you press the
key and the command will be ignored.
To stop scanning
To cancel the scan, briefly press the key. A low beep will
be heard and will stop flashing on the display.
USING SCAN
• If a busy channel is found, scanning will pause on that channel
to allow the signal to be heard and will remain there for as
long as the channel remains busy. Once the channel has been
clear for 5 seconds, scanning will resume automatically.
• If your radio is paused on a busy channel and you wish to
remain there, briefly press the key. The radio will exit
Scan mode and remain on the busy channel.
• If the radio pauses on a busy channel and you don’t wish
to listen to the conversation briefly press either of the or
keys. The radio will skip over that channel and resume
scanning from the next channel in the sequence.

TX3100 INSTRUCTION MANUAL PAGE 15
SKIPPING OVER BUSY CHANNELS WHILE
SCANNING
When scanning, if the radio pauses on a busy channel and you
don’t wish to listen to the conversation briefly press either of the
or keys. The radio will skip over that channel and resume
scanning from the next channel in the sequence.
TRANSMITTING WHILE SCANNING
When scanning, your radio remembers the last channel on which
it transmitted and will automatically return to that channel each
time the PTT is pressed.
Before scanning, you can define your initial transmit channel by
preselecting that channel first before you press the key.
Once scanning has commenced, pressing the PTT will pause the
scan and your radio will transmit on the preselected channel. If
there is no activity on the channel after 5 seconds the
scan resumes.
• If scanning pauses on a (different) busy channel and you press
the PTT during this time, the busy channel becomes your new
default transmit channel. If there is no activity on the channel
after 5 seconds the scan resumes but subsequent presses of
the PTT will return you to this new channel. This allows you to
continue to use this channel even if pauses in the conversation
exceed the 5 second timeout period.
• If the radio stops on another busy channel then restarts
without the PTT being pressed, your default transmit channel
won’t change.
INSTALLATION
The TX3100 is supplied with a slim, U-shaped mounting bracket.
The bracket can be screwed or bolted in any convenient location
in your vehicle (under or above the dash, on the centre console,
etc.) using the mounting slots provided in the bracket. The
TX3100 contains a built-in speaker and should be installed in a
location where the sound can be heard from the driver’s position.
Alternatively it can be installed in a less audible location and an
extension speaker used instead.
The microphone comes complete with a mounting clip. Its light
weight design allows it to be mounted in almost any convenient
position accessible to the driver.
When installing the radio, avoid mounting it close to heaters or
air conditioners. Screw the microphone’s clip to a firm surface. Fit
the TX3100 into the bracket and tighten the gimbal knobs. Place
the microphone in its mounting clip. Finally, plug the microphone
into the front panel of the TX3100 and the power and antenna
leads into the sockets provided on the rear of the radio.

PAGE 16 INSTRUCTION MANUAL TX3100
ANTENNA INSTALLATION
It is essential to select a good quality, high efficiency, 477 MHz
antenna. A poor quality antenna or one not designed for the
specific frequency band you are using will give very
poor performance.
GME have a wide range of suitable 477 MHz UHF CB antennas
to suit most installations and applications. We recommend
contacting your local GME retailer for advice.
Connect the antenna cable to the rear antenna socket using a
PL259 coaxial connector.
NOISE SUPPRESSION
The inherent design of FM transceivers result in a high level of
resistance to ignition and electrical interference. However in
some installations it may be necessary to take additional steps to
help reduce or eliminate noise interference. During installation,
try to route the DC battery leads, the antenna lead or any
accessory wires away from the engine compartment, ignition or
alternator wiring. If the noise continues, it may be necessary to
fit a suppression kit in which case we recommend you consult an
auto electrician for advice specific to your installation.
Higher frequency electrical interference caused by electric motors
can be suppressed directly at the motor terminals.
Fitting the Microphone
Mounting the Bracket
Slide Microphone
into the mounting clip

TX3100 INSTRUCTION MANUAL PAGE 17
The mounting bracket can be oriented with the arms extending
either forward or backwards to adjust the position of the front
panel with reference to the mounting point.
Fitting the Radio
Fit radio into bracket and tighten gimbal knobs.
Your TX3100 is fitted with a GME model label adjacent to
the LCD. If the final orientation of your radio results in this
label being upside down, please fit the supplementary GME
label supplied. Simply remove the backing tape and install the
supplementary label over the top of the current GME label.
58 mm
31 mm
Label
TX3100

PAGE 18 INSTRUCTION MANUAL TX3100
Connecting the Microphone
The microphone uses a 6 pin plug and socket. To connect:
1. Position the microphone plug in the socket so the plastic tab
faces away from the speaker, and press the plug into the
socket until it ‘clicks’.
2. Gently slide the rubber boat towards the hole surrounding the
socket and press into place until it locks into the front panel.
Removing the Microphone
1. Slide the rubber boot back along the microphone cord.
2. Squeeze the plastic tab on the microphone plug towards the
plug to unlock it while gently pulling the plug outwards. If
the plug does not come out easily, the tab has not released
correctly and should be squeezed again.
Flipping the Display
The TX3100’s small size allows it to be mounted in almost any
convenient location. However the most suitable location may
sometimes require the unit to be installed upside-down when
referenced to your driving position.
The TX3100 is designed to overcome this situation by allowing
the display to be ‘flipped’. In addition the keys have symbols
that can be read from either direction.
You can flip the display as follows.
With the unit installed or held in the required orientation;
1. Turn the unit off.
2. Press and hold the key while turning the radio on.
3. The display will be flipped to match the radio’s orientation.
Cable
Screwdriver
Locking lever
move left to
release plug
Cable entry
hole
S
TX3100
Front Panel Upright (speaker above)
S
TX3100
Front Panel Flipped (speaker below)
Plastic tab
Speaker

TX3100 INSTRUCTION MANUAL PAGE 19
DC POWER CONNECTION
The TX3100 is designed for 13.8 volts DC, negative earth
installations only (i.e. where the negative terminal of the battery
is connected to the chassis or frame of the vehicle).
There are two recommended methods of installation.
Radio remains ON when the ignition switch is OFF
Connect the radio's negative (black) lead to the vehicle's chassis,
or if preferred, directly to the battery's negative terminal.
The radio's positive (red) lead should be connected via the 2
amp fuse to the battery's positive terminal. Alternatively, the
positive lead could be connected into the fuse box at a point that
has +13.8 volts continuously available (the battery side of the
ignition switch) via the 2 amp fuse.
Radio turns OFF with the ignition switch:
Connect the radio's negative (black) lead to the vehicle's chassis,
or if preferred, directly to the battery's negative terminal.
The radio's positive (red) lead should connect to an accessory
point in the vehicle's fuse box via the 2 amp fuse. This point
should supply +13.8 volts only when the ignition switch is turned
ON or in the ACCESSORY position.
Radio remains ON when ignition switch is OFF
RED
BLACK
Chassis
Car battery
Ignition Switch
Radio turns ON and OFF with ignition switch
RED
BLACK
Chassis
Car battery
Ignition Switch
To
TX3100
Radio remains ON when ignition switch is OFF
RED
BLACK
Chassis
Car battery
Ignition Switch
Radio turns ON and OFF with ignition switch
RED
BLACK
Chassis
Car battery
Ignition Switch
To
TX3100

PAGE 20 INSTRUCTION MANUAL TX3100
HIGH VOLTAGE DETECTION
The TX3100 has a built-in, high voltage detection system to
warn you if an overvoltage situation occurs.
If the power supply voltage exceeds 18 volts DC, the channel
display will flash ‘hi dc’ for 5 seconds when the unit is first
turned ON, or at the time the voltage exceeds 18 volts. In
addition, when transmitting, the indicator will flash and
the transmitter will select low output power.
If the overvoltage warning appears you should switch your
TX3100 OFF and disconnect it from the power source, before
locating the cause of the trouble.
Once the high voltage warning has been triggered, and you
have fixed the source of the problem, you will need to switch the
TX3100 OFF then ON again to reset it.
The power source must not exceed 25 volts otherwise permanent
damage may occur to your radio, which may not be covered by
the manufacturer’s warranty.
ANTENNA CONNECTION
GME supply a wide range of mobile and base station antennas
designed specifically for UHF CB communications.
The antennas are fitted with a coaxial plug suitable for
connection to the antenna socket on the rear panel of the radio.
Extension Speaker
(optional)
Antenna Socket
DC Socket
Coax Cable
Connector Plug
Fuse
RED +
– BLACK
UHF Aerial
Repeater output channels
(Duplex)
11 Officially designated call
channel
40 Road channel
18 Caravan and motor-home
10 4WD / Off-road
Emergency use only
Telemetry / SelCall use only. Voice
transmission is inhibited as required
by AS/NZS 4365.2011
Guard band channel. Transmission
is inhibited as required by
AS/NZ 4365.2011
Repeater input channels
(Duplex)