GME TX677 User manual

TX677 Instruction Manual 1
TX677
2 WATT UHF CB HANDHELD RADIO
ARTWORK SUMMARY
DRAWING # 50157-2
PART # 311095
JIRA REFERENCE GRA-3247
ECO # N/A
SUPPLIER Online
MPE #
INSTRUCTION MANUAL

TX677 Instruction Manual
2
PREFACE
COPYRIGHT NOTICE
GME Pty Ltd reserves all rights to this document and the information contained
herein. Reproduction, use or disclosure to third parties without express permission
is strictly prohibited.
© 2022 GME Pty Ltd, Sydney, Australia
SAFETY INFORMATION
The TX677 is a radio transmitting device.
• When transmitting, keep the antenna more than 25 mm from any part
of the head or body.
• Do not transmit near electrical blasting equipment or in explosive
atmospheres.
• Do not allow children to operate a radio transmitter unsupervised.
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.

TX677 Instruction Manual 3
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 – 40 as well as the newer channels allocated
from 41 – 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.

TX677 Instruction Manual
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1. Consumer guarantees
1.1 Our goods come with guarantees that cannot be excluded under the
Australian Consumer Law. You are entitled to a replacement or refund
for a major failure and for compensation for any other reasonably
foreseeable loss or damage. You are also entitled to have the goods
repaired or replaced if the goods fail to be of acceptable quality and the
failure does not amount to a major failure.
1.2 To the extent we are able, we exclude all other conditions, warranties
and obligations which would otherwise be implied.
2. Warranty against defects:
2.1 This Warranty is in addition to and does not limit, exclude or restrict
your rights under the Competition and Consumer Act 2010 (Australia) or
any other mandatory protection laws that may apply.
2.2 We warrant our goods to be free from defects in materials and
workmanship for the warranty period (see warranty table) from the
date of original sale (or another period we agree to in writing). Subject
to our obligations under clause 1.2, we will at our option, either repair
or replace goods which we are satised are defective. We warrant any
replacement parts for the remainder of the period of warranty for the
goods into which they are incorporated.
2.3 To the extent permitted by law, our sole liability for breach of a
condition, warranty or other obligation implied by law is limited.
(a) In the case of goods we supply, to any one of the following as we
decide –
(i) The replacement of the goods or the supply of equivalent
goods.
(ii) The repair of the goods.
(iii) The cost of repairing the goods or of acquiring equivalent
goods.
(b) In the case of services we supply, to any one of the following as we
decide –
(i) The supplying of the services again
(ii) The cost of having the services supplied again.
GME CONTRACT WARRANTY AGAINST DEFECTS

TX677 Instruction Manual 5
2.4 For repairs outside the warranty period, we warrant our repairs to
be free from defects in materials and workmanship for three months
from the date of the original repair. We agree to re-repair or replace (at
our option) any materials or workmanship which we are satised are
defective.
2.5 We warrant that we will perform services with reasonable care and skill
and agree to investigate any complaint regarding our services made in
good faith. If we are satised that the complaint is justied, and as our
sole liability to you under this warranty (to the extent permitted at law),
we agree to supply those services again at no extra charge to you.
2.6 To make a warranty claim you must before the end of the applicable
warranty period (see warranty table), at your own cost, return the
goods you allege are defective, provide written details of the defect,
and give us an original or copy of the sales invoice or some other
evidence showing details of the transaction.
Before returning any goods you will be required to follow the available
options:
Contact our Customer Support Team on 1300 463 463 or
[email protected].
A customer support team member will troubleshoot and validate if
your product is faulty. If so, they will email you a product RMA (Return
Material Authorisation).
Products that are authorised to be returned to GME must include the
following:
RMA form (Return Material Authorisation)
A copy of your proof of purchase, the faulty product, including all
accessories
2.7 Send your claim to:
GME Pty Ltd.
17 Gibbon Rd, Winston Hills, NSW 2153, Australia.
Tel: [phone] Fax: [phone].
Email: [email protected]
2.8 If we determine that your goods are defective, we will pay for the cost
of returning the repaired or replaced goods to you, and reimburse you
for your reasonable expenses of sending your warranty claim to us.

TX677 Instruction Manual
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3. What this warranty does not cover:
3.1 This warranty will not apply in relation to:
(a) Goods modied or altered in any way.
(b) Defects and damage caused by use with non Standard
Communications products.
(c) Repairs performed other than by our authorised representative.
(d) Defects or damage resulting from misuse, accident, impact or
neglect.
(e) Goods improperly installed or used in a manner contrary to the
relevant instruction manual; or
(f) Goods where the serial number has been removed or made illegal.
4. Warranty period:
4.1 We provide the following warranty on GME and Kingray products. No
repair or replacement during the warranty period will renew or extend
the warranty period past the period from original date of purchase.
Product Type Warranty Period
UHF CB Portable Radio (TX677) 2 Years
Li-ion Battery Packs 1 Year

TX677 Instruction Manual 7
CONTENTS
PREFACE...................................................................................2
Copyright Notice......................................................................... 2
Safety Information...................................................................... 2
Important Information Concerning UHF CB Radio ..................... 2
CONTENTS ................................................................................7
EMERGENCY CHANNELS............................................................9
Telemetry Channels .................................................................... 9
Important Advice ........................................................................ 9
Accessories Supplied ................................................................ 10
Optional Accessories ................................................................ 10
Features.................................................................................... 11
CONTROLS ..............................................................................12
LCD ICONS ..............................................................................13
CHARGING THE BATTERY ........................................................14
Removing the Battery Pack...................................................... 14
Retting the Battery Pack ........................................................ 14
Charging the Battery Pack........................................................ 15
Charging the TX677 Single Unit ............................................... 15
In-Vehicle Charging................................................................... 15
CHARGING THE TX677 TWIN PACK .........................................16
Battery Usage........................................................................... 17
Battery Low Alert ..................................................................... 17
Conserving Battery Power........................................................ 17
Standby Mode .......................................................................... 17
Use CTCSS/DCS ......................................................................... 18
Avoid Scanning ......................................................................... 18
Use Low Transmit Power.......................................................... 18

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GENERAL OPERATION.............................................................18
Turning the Radio On/O.......................................................... 18
Adjusting the Volume............................................................... 18
Display Lighting........................................................................ 19
Receiving Signals...................................................................... 19
TRANSMITTING.......................................................................19
Time-out Timer ......................................................................... 20
SELECTING CHANNELS ............................................................20
SQUELCH ................................................................................20
KEYPAD LOCK.........................................................................21
DUPLEX OPERATION...............................................................21
SCANNING ..............................................................................22
ADDING OR REMOVING CHANNELS.........................................22
SCANNING FOR CHANNELS .....................................................22
Scanning Features.................................................................... 23
CTCSS, DCS AND SILENT MODE ...............................................23
MENU OPTIONS ......................................................................25
USING THE MENU ...................................................................25
DUPLEX MODE SELECTION......................................................26
CTCSS AND DCS CODE SELECTION ...........................................26
TRANSMITTER POWER ...........................................................28
VOX SETTINGS........................................................................28
SQUELCH LEVEL SETTING........................................................29
ROGER BEEP TONE .................................................................29
BUTTON BEEP.........................................................................30
CALL ALARM SELECTION.........................................................30
DUAL WATCH ..........................................................................31
DUAL WATCH OPERATION.......................................................31
SPECIFICATIONS......................................................................35

TX677 Instruction Manual 9
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 channel 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 radio has a transmit-inhibit applied to channels 22 and 23.
In the event that 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.
IMPORTANT ADVICE
• Read all instructions carefully and completely before operating your
radio and retain this manual for future reference.
• Never connect the radio to a power source other than the supplied
battery. This may damage your radio.
• Do not place your radio in front of a vehicle airbag.
• Do not use your radio with a damaged antenna.
• Do not attempt to modify your radio in any way.
• Always charge your radio at normal room temperature.
• Always switch o your radio where notices restrict the use of two-way
radio or mobile telephones.
• Use only GME approved rechargeable battery packs with the supplied charger.
• Avoid storing or charging your radio in direct sunlight.
• Avoid storing or using your radio where temperatures are below -20°C
or above +60°C.

TX677 Instruction Manual
10
ACCESSORIES SUPPLIED
TX677
The following items are supplied as part of the TX677 radio set:
• 2 Watt Handheld UHF CB Radio (TX677)
• 1600mAh Li-Ion Battery Pack (BP021)
• USB Multi-charging Cable (LE061)
• AC Adaptor (PS003)
• Belt Clip (MB047)
TX677TP
The following items are supplied as part of the TX677TP radio set:
• 2 x 2 Watt Handheld UHF CB Radio (TX677)
• 2 x 1600mAh Li-Ion Battery Pack (BP021)
• Dual Desktop Charger (BCD017)
• USB Multi-charging Cable (LE061)
• AC Adaptor (PS003)
• 2 x Belt Clip (MB047)
TX677QP
The following items are supplied as part of the TX677QP radio set:
• 4 x 2 Watt Handheld UHF CB Radios (TX677)
• 4 x 1600mAh Li-Ion Battery Packs (BP021)
• 2 x Dual Rapid Desktop Chargers (BCD017)
• 2 x Micro USB Charging Cables (LE061)
• Rugged Carry Case
• 2 x 12V USB Vehicle Chargers (BCV010)
• 2 x AC Adaptors (PS002)
• 4 x Belt Clips (MB047)

TX677 Instruction Manual 11
OPTIONAL ACCESSORIES
The following optional accessories are available as part of the TX677 radio set:
• Twin Desktop Charger (BCD017)
• USB 12V Vehicle Charger (BCV010)
• Leather Carry Case (LC008)
• Ear Microphone (HS009)
• Speaker Microphone (MC007)
• Clear Acoustic Tube and Lapel Microphone (HS010)
Note: Instruction manuals are available online at
https://www.gme.net.au/manuals-and-brochures.aspx
FEATURES
Feature Description
Transmit (TX) 2.0/0.5 watt RF power: Selectable transmitter power allows you to conserve
battery power when transmitting in close range by using the Low Power
setting.
Individually programmable Duplex function: User selectable for only those
individual channels in your area that have repeaters, leaving others free for
use as extra simplex channels.
Receive (RX) 80† channels 477 MHz UHF CB.
Power Save feature: Conserves battery power by sleeping during periods of
inactivity.
Calling Tone and Roger Beep: Alerts you to incoming calls.
Signal receive indicator.
Scanning
and Memory
Functions
Microprocessor controlled frequency synthesiser:
Allows user programmable control of scanning, channel memories and
selected feature options.
Programmable scan function: Scans up to 80 UHF CB channels.
Dual Watch: Monitors two channels simultaneously.
Privacy
Functions
CTCSS & DCS: A built-in Continuous Tone Coded Squelch System and a Digital
Coded Squelch option provide quiet channel operation.
Physical
Properties
Flexible antenna.
Rugged construction.
User Controls
and Interface
Keypad Lock: Prevents accidental button presses.
Backlit LCD: For night viewing.
† Refer the preface for important information concerning the UHF CB radio.

TX677 Instruction Manual
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CONTROLS
This section provides gures and a table that describes various parts of the TX677
radio.
TX677 Instrucon Manual
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Content
Controls
This secon provides gures and a table that describes various parts of the TX677 radio.
10
3
2
4
5
6
1
7
8
16 15 14
13
12 11
9
10
The table that follows is a numbered descripon of the parts of the TX677 radio, as labeled in the
diagram above.
Label No. Descripon Label No. Descripon
1Antenna 9 Accessory Jack
2PTT (Push to Talk) Switch 10 Belt Clip
3 Squelch/Silent/Memory Key 11 Baery
4 Indicator LED 12 USB Charge Socket
5 Lanyard Mount 13 LCD Screen
6 On/O Switch and Volume control 14 Channel up key
7 Speaker 15 Menu/Funcon Key
8Microphone 16 Channel down key
The table that follows is a numbered description of the parts of the TX677 radio,
as labeled in the diagram above.
Label
No. Description Label No. Description
1 Antenna 9 Accessory Jack
2 PTT (Push to Talk) Switch 10 Belt Clip
3 Squelch/Silent/Memory Key 11 Battery
4 Indicator LED 12 USB Charge Socket
5 Lanyard Mount 13 LCD Screen
6 On/O Switch and Volume Control 14 Channel Up Key
7 Speaker 15 Menu/Function Key
8 Microphone 16 Channel Down Key

TX677 Instruction Manual 13
LCD ICONS
The following gure and table below describes the icons on the LCD screen of the TX677
radio.
TX677 Instrucon Manual
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LCD Icons
The following gure and table below describes the icons on the LCD screen of the TX677 radio.
1
23456
8
7
9
17
18 16
15 14 13
12
10
11
The table that follows is a numbered descripon of the icons on the LCD screen, as labeled in the
diagram above.
Label
No.
Descripon Label No Descripon
1Monitor icon:
Appears when the Squelch is open.
10 Baery icon:
Displays baery charge level.
2Dual Watch icon:
Appears when Dual Watch is acve.
11 Duplex icon:
Appears on channels where Duplex
is enabled.
3VOX icon: Appears when VOX mode
is acve.
12 Roger Beep icon:
Appears when the Roger Beep tones
are acve.
4Key Lock icon:
Appears when the keypad is locked.
13 Transmit icon:
Appears when transming.
5 Buon Beep icon:
Appears when buon conrmaon
tones are on.
14 Receive icon:
Appears when receiving signals.
6High Power icon:
Appears when High TX power is
selected.
15 Power Save icon:
Appears when the radio is sleeping.
7Low Power icon:
Appears when Low TX power is
selected.
16 CTCSS/DCS display:
Displays the selected CTCSS or DCS
tone when Silent mode is acve.
8Funcon icon:
Appears when the funcon ‘F’ key
is pressed to acvate secondary
funcons.
17 CTCSS/DCS Silent icons:
Indicates a CTCSS or DCS tone has
been set in the menu.
9Scan icon:
Flashes when radio is scanning.
18 Channel display:
Displays the selected channel in use.
The table that follows is a numbered description of the icons on the LCD screen, as
labeled in the diagram above.
Label
No. Description Label No Description
1Monitor icon:
Appears when the Squelch is open. 10 Battery icon: Displays battery charge level.
2Dual Watch icon:
Appears when Dual Watch is active. 11
Duplex icon:
Appears on channels where Duplex
is enabled.
3VOX icon:
Appears when VOX mode is active. 12
Roger Beep icon:
Appears when the Roger Beep tones
are active.
4Key Lock icon:
Appears when the keypad is locked. 13 Transmit icon: Appears when transmitting.
5
Button Beep icon:
Appears when button conrmation
tones are on.
14 Receive icon:
Appears when receiving signals.
6
High Power icon:
Appears when High TX power is
selected.
15 Power Save icon:
Appears when the radio is sleeping.
7
Low Power icon:
Appears when Low TX power is
selected.
16
CTCSS/DCS display:
Displays the selected CTCSS or DCS
tone when Silent mode is active.
8
Function icon:
Appears when the function ‘F’ key
is pressed to activate secondary
functions.
17
CTCSS/DCS Silent icons:
Indicates a CTCSS or DCS tone has
been set in the menu.
9Scan icon:
Flashes when radio is scanning. 18 Channel display: Displays the selected channel in use.

TX677 Instruction Manual
14
CHARGING THE BATTERY
The TX677 is powered by a 3.7V 1600mAh Li-ion battery pack. The battery pack
should be fully charged before being used for the rst time to ensure maximum
capacity is available.
REMOVING THE BATTERY PACK
1. Ensure that your radio is switched o.
2. Hold the radio upside down.
3. Using your ngernail, slide the battery catch towards the front of
the radio to release the battery then slide the battery towards you.
The battery pack should separate from the radio.
TX677 Instrucon Manual
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Content
Charging the Baery
The TX677 is powered by a 3.7V 1600mAh Li-ion baery pack. The baery pack should be fully
charged before being used for the rst me to ensure maximum capacity is available.
Removing the Baery Pack
1. Ensure that your radio is switched o.
2. Hold the radio upside down.
3. Using your ngernail, slide the baery catch towards the front of the radio to release the
baery then slide the baery towards you. The baery pack should separate from the
radio.
Slide to release
Reng the Baery Pack
1. Ensure that your radio is switched o.
2. Align the slots in the baery pack with the baery guides on the back of the radio.
3. Slide the baery pack upwards as far as it will go unl it clicks.
Slide to lock baery
REFITTING THE BATTERY PACK
1. Ensure that your radio is switched o.
2. Align the slots in the battery pack with the battery guides on the
back of the radio.
3. Slide the battery pack upwards as far as it will go until it clicks.
TX677 Instrucon Manual
12 June 2018
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Content
Charging the Baery
The TX677 is powered by a 3.7V 1600mAh Li-ion baery pack. The baery pack should be fully
charged before being used for the rst me to ensure maximum capacity is available.
Removing the Baery Pack
1. Ensure that your radio is switched o.
2. Hold the radio upside down.
3. Using your ngernail, slide the baery catch towards the front of the radio to release the
baery then slide the baery towards you. The baery pack should separate from the
radio.
Slide to release
Reng the Baery Pack
1. Ensure that your radio is switched o.
2. Align the slots in the baery pack with the baery guides on the back of the radio.
3. Slide the baery pack upwards as far as it will go unl it clicks.
Slide to lock baery

TX677 Instruction Manual 15
CHARGING THE BATTERY PACK
While the battery is charging, the indicator LED on the radio will light red and the
battery icon on the display will animate to show the battery is charging. Once the
battery is fully charged, the radio’s indicator LED will change to green and the
battery icon will show the full charge state.
CHARGING THE TX677 SINGLE UNIT
The TX677 is supplied with a 240V AC adaptor and a USB lead. The AC adaptor will
charge a fully discharged 1600mAh battery pack to full capacity in around 4 hours.
To charge the radio:
1. Plug the AC adaptor into a 240V AC outlet.
2. Plug the USB lead into the USB socket on the AC adaptor and the
micro USB connector into the charging socket on the side of the
radio.
The radio will begin charging. During this time the radio’s indicator LED will light
red and the battery icon on the display will animate. Once the battery is fully
charged, the indicator LED will change to green and the battery icon will show the
fully charge state.
IN-VEHICLE CHARGING
A 12V vehicle charger is available as an optional accessory. This will also charge
your radio’s battery to full capacity in around 4 hours using 12V DC from your
vehicle’s accessory socket.

TX677 Instruction Manual
16
CHARGING THE TX677 TWIN PACK
The TX677 Twin Pack is supplied with a dual desktop charger, 240V AC adaptor,
12V vehicle charger and a USB lead. Using the AC adaptor, the dual desktop
charger will charge two fully discharged 1600 mAh battery packs to full capacity in
around 4 hours.
If using the 12V vehicle charger with the dual desktop charger, two fully
discharged 1600 mAh battery packs can be charged to full capacity in around 8
hours (with radios switched o).
Note: When using the 12V vehicle charger to charge two radios via the dual
desktop charger, we recommend switching both radios o while charging to
ensure the batteries reach their full charge in the allotted 8 hour period. If one
or more radios remain switched on during the charging cycle the batteries will
achieve close to their full charge in the allotted time but the indicator LED may
not switch to green. This is due to the lower charge current available from the 12V
vehicle charger.
Both the AC charger and 12V vehicle charger can also be used to directly charge a
single TX677 radio in around 4 hours.
TX677 Instrucon Manual
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Content
Charging the TX677 Twin Pack
The TX677 Twin Pack is supplied with a dual desktop charger, 240V AC adaptor, 12V vehicle charger
and a USB lead. Using the AC adaptor, the dual desktop charger will charge two fully discharged
1600 mAh baery packs to full capacity in around 4 hours.
If using the 12V vehicle charger with the dual desktop charger, two fully discharged 1600 mAh
baery packs can be charged to full capacity in around 8 hours (with radios switched o).
When using the 12V vehicle charger to charge two radios via the dual desktop charger, we
recommend switching both radios o while charging to ensure the baeries reach their full
charge in the alloed 8 hour period. If one or more radios remain switched on during the
charging cycle the baeries will achieve close to their full charge in the alloed me but the
indicator LED may not switch to green. This is due to the lower charge current available from
the 12V vehicle chargee.
Both the AC charger and 12V vehicle charger can also be used to directly charge a single TX677 radio
in around 4 hours.
5
6
2
3
4
1
4
The table that follows is a numbered descripon of the parts of the TX677 and dual desktop charger,
as labeled in the diagram above.
Label No. Descripon Label No Descripon
1Desktop charger 4 Rear cradle
2TX677 5 USB lead from AC or 12V adaptor
3 Indicator LED 6 Front cradle
The table that follows is a numbered description of the parts of the TX677 and
dual desktop charger, as labeled in the diagram above.

TX677 Instruction Manual 17
Label No. Description Label No Description
1 Desktop charger 4 Rear cradle
2 TX677 5 USB lead from AC or 12V adaptor
3 Indicator LED 6 Front cradle
BATTERY USAGE
The time taken to discharge the battery pack will depend on how you use the
radio. The battery pack supplied is powerful enough for up to 20 hours of use
under average conditions using low power.
The sections that follow provide directions and recommendations on the optimal
use of the battery pack.
BATTERY LOW ALERT
When the battery icon blinks on the radio’s display, the battery level is low and
the battery pack should be recharged.
CONSERVING BATTERY POWER
The radio has built-in power saving features to help you get the maximum amount
of time between charges from your Li-ion battery pack. If you need to operate
your radio in a situation where you require maximum battery life (e.g. a remote
site where there is no convenient recharging facility nearby) the following hints
can greatly reduce the amount of power drawn from the battery pack.
STANDBY MODE
The radio will automatically enter the Standby mode when it is inactive (i.e. not
transmitting or receiving signals).
While in Standby mode it will still check for incoming signals but it will draw
considerably less power from the battery pack. As soon as a signal is heard or the
keys are pressed the radio will ‘wake up’ again. This Standby mode is automatic
and by itself can extend the battery life by many hours.

TX677 Instruction Manual
18
USE CTCSS/DCS
If you are expecting to receive signals on a busy channel, you can program that
channel for CTCSS/ DCS operation and get the other person to call you using the
same CTCSS/DCS tone. Your radio will then remain in Standby and ignore all other
signals until your selected CTCSS/DCS tone is received.
AVOID SCANNING
The radio draws more power from the battery pack when scanning than when
monitoring a single channel. This is because it must ‘wake up’ more often to
monitor each channel for activity. In addition, scanning increases the chance of
nding a signal thereby keeping the receiver ‘awake’ and the Squelch open more
often.
USE LOW TRANSMIT POWER
The transmitter has both high and low power settings. If you are only operating
over short distances, are in a reasonably high location or are close to a local
repeater, try using the Low transmitter power setting. This reduces the transmitter
power to 0.5 watts which increases the talk time available.
GENERAL OPERATION
TURNING THE RADIO ON/OFF
1. Rotate the Volume control clockwise past the click to turn the radio
on.
2. Rotate the Volume control counter-clockwise past the click to turn
the radio o again.
ADJUSTING THE VOLUME
With the unit powered on, rotate the Volume control clockwise to increase the
volume and counter- clockwise to decrease the volume.

TX677 Instruction Manual 19
DISPLAY LIGHTING
The LCD backlighting activates automatically whenever a key is pressed and turns
o automatically after about 5 seconds.
RECEIVING SIGNALS
While the radio is not receiving signals, it will remain in ‘standby’ mode to
conserve battery power and ‘Save’ will be displayed. When a signal is received,
the LED indicator on the upper edge of the radio will light green and the
TX677 Instrucon Manual
12 June 2018
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Content
Use Low Transmit Power
The transmier has both high and low power sengs. If you are only operang over short distances,
are in a reasonably high locaon or are close to a local repeater, try using the Low transmier power
seng. This reduces the transmier power to 0.5 was which increases the talk me available.
General Operaon
Turning the Radio On/O
1. Rotate the Volume control clockwise past the click to turn the radio on.
2. Rotate the Volume control counter-clockwise past the click to turn the radio o again.
Adjusng the Volume
With the unit powered on, rotate the Volume control clockwise to increase the volume and counter-
clockwise to decrease the volume.
Display Lighng
The LCD backlighng acvates automacally whenever a key is pressed and turns o automacally
aer about 5 seconds.
Receiving Signals
While the radio is not receiving signals, it will remain in ‘standby’ mode to conserve baery power
and ‘Save’ will be displayed. When a signal is received, the LED indicator on the upper edge of the
radio will light green and the icon will appear on the display. Adjust the Volume control for a
comfortable listening level.
If the incoming signal is encoded with a CTCSS or DCS tone matching the one set in your radio,
the LED indicator will light orange and you will be able to hear the signal in the speaker. If the LED
indicator lights green and the icon appears but you cannot hear the signal, it is likely that the
incoming signal is using a dierent CTCSS or DCS tone to that selected in your radio (see Menu
opons for more details on seng CTCSS/DCS tones).
If no further signals are received, the unit will return to ‘standby’ mode aer a few seconds.
icon
will appear on the display. Adjust the Volume control for a comfortable listening
level.
If the incoming signal is encoded with a CTCSS or DCS tone matching the one set
in your radio, the LED indicator will light orange and you will be able to hear the
signal in the speaker. If the LED indicator lights green and the
TX677 Instrucon Manual
12 June 2018
© 2018 Standard Communicaons Pty Ltd trading as GME. All rights reserved.
18
50157
Content
Use Low Transmit Power
The transmier has both high and low power sengs. If you are only operang over short distances,
are in a reasonably high locaon or are close to a local repeater, try using the Low transmier power
seng. This reduces the transmier power to 0.5 was which increases the talk me available.
General Operaon
Turning the Radio On/O
1. Rotate the Volume control clockwise past the click to turn the radio on.
2. Rotate the Volume control counter-clockwise past the click to turn the radio o again.
Adjusng the Volume
With the unit powered on, rotate the Volume control clockwise to increase the volume and counter-
clockwise to decrease the volume.
Display Lighng
The LCD backlighng acvates automacally whenever a key is pressed and turns o automacally
aer about 5 seconds.
Receiving Signals
While the radio is not receiving signals, it will remain in ‘standby’ mode to conserve baery power
and ‘Save’ will be displayed. When a signal is received, the LED indicator on the upper edge of the
radio will light green and the icon will appear on the display. Adjust the Volume control for a
comfortable listening level.
If the incoming signal is encoded with a CTCSS or DCS tone matching the one set in your radio,
the LED indicator will light orange and you will be able to hear the signal in the speaker. If the LED
indicator lights green and the icon appears but you cannot hear the signal, it is likely that the
incoming signal is using a dierent CTCSS or DCS tone to that selected in your radio (see Menu
opons for more details on seng CTCSS/DCS tones).
If no further signals are received, the unit will return to ‘standby’ mode aer a few seconds.
icon appears
but you cannot hear the signal, it is likely that the incoming signal is using a
dierent CTCSS or DCS tone to that selected in your radio (see Menu options for
more details on setting CTCSS/DCS tones).
If no further signals are received, the unit will return to ‘standby’ mode after a few
seconds.
TRANSMITTING
To transmit:
1. Press and hold the PTT (Push-To-Talk) switch. The other radio
you are talking to must be set to the same channel.
2. Hold the radio approximately 5-8 cm from your mouth with the
antenna vertical and speak into the built-in microphone.
3. While the PTT switch is pressed, the LED indicator on the upper
edge of the radio will light red and the
TX677 Instrucon Manual
12 June 2018
© 2018 Standard Communicaons Pty Ltd trading as GME. All rights reserved.
19
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Content
Transming
To transmit:
1. Press and hold the PTT (Push-To-Talk) switch. The other radio you are talking to must be
set to the same channel.
2. Hold the radio approximately 5-8 cm from your mouth with the antenna vercal and
speak into the built-in microphone.
3. While the PTT switch is pressed, the LED indicator on the upper edge of the radio will
light red and the icon will appear on the LCD.
4. When you have nished speaking, release the PTT switch to receive incoming signals (it is
not possible to transmit and receive at the same me). If no further signals are received,
the unit will revert to ‘Standby’ mode.
The PTT switch can also be used to transmit a Call Alarm Melody.
When the call alarm melody is enabled (see Menu opons for more details on
Call Alarm sengs), pressing the PTT switch twice quickly will play the call alarm melody in the
speaker of other radios on the same channel to alert them to your call. During this me the
icon is displayed and the LED indicator will light red for about 5 seconds. The call alarm can
only be sent once per minute.
Time-out Timer
The radio has a built-in me-out mer that automacally limits transmissions to a maximum of
3 minutes of connuous operaon. This feature is required by the ACMA to prevent accidental
blocking of the frequency should your PTT switch become jammed or be otherwise pressed
accidentally. When the me-out mer acvates, the radio will beep and ‘tot’ is displayed briey on
the LCD. Normal operaon will be restored once the PTT switch is released.
Selecng Channels
1. In the ‘Standby’ mode, press the key to step up one channel or the key to step down
one channel.
2. Press and hold the or keys to quickly scroll through the channels.
Squelch
The Squelch is used to eliminate the background noise when there are no signals present. When
the squelch is open the receiver’s background noise can be heard. When the squelch is closed the
receiver remains quiet while there are no signals present but any incoming signals will override the
squelch and be heard in the speaker.
To open the squelch:
Briey press the SQL key. This will allow you to check the current channel for acvity before
transming, parcularly if you have CTCSS/DCS enabled.
icon will appear on the
LCD.
4. When you have nished speaking, release the PTT switch to
receive incoming signals (it is not possible to transmit and receive
at the same time). If no further signals are received, the unit will
revert to ‘Standby’ mode.

TX677 Instruction Manual
20
TIME-OUT TIMER
The radio has a built-in time-out timer that automatically limits transmissions to
a maximum of 3 minutes of continuous operation. This feature is required by the
ACMA to prevent accidental blocking of the frequency should your PTT switch
become jammed or be otherwise pressed accidentally. When the time-out timer
activates, the radio will beep and ‘tot’ is displayed briey on the LCD. Normal
operation will be restored once the PTT switch is released.
SELECTING CHANNELS
1. In the ‘Standby’ mode, press the  key to step up one channel or
the  key to step down one channel.
2. Press and hold the  or  keys to quickly scroll through the
channels.
SQUELCH
The Squelch is used to eliminate the background noise when there are no signals
present. When the squelch is open the receiver’s background noise can be heard.
When the squelch is closed the receiver remains quiet while there are no signals
present but any incoming signals will override the squelch and be heard in the
speaker.
To open the squelch:
Briey press the SQL key. This will allow you to check the current channel for
activity before transmitting, particularly if you have CTCSS/DCS enabled.
When the squelch is open, the LED indicator on the upper edge of the radio will
light green and
TX677 Instrucon Manual
12 June 2018
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20
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Content
When the squelch is open, the LED indicator on the upper edge of the radio will light green and the
and icons will appear on the display. During this me you will hear stac or hiss if the channel is
clear. Do not transmit if you hear any signals.
To close the squelch:
Briey press the SQL key again.
The squelch sensivity is preset in the Menu – Squelch Level seng (see Menu opons for more
details on seng the squelch sensivity).
Keypad Lock
The Keypad Lock disables the keys to prevent accidental key presses from changing the preferred
sengs of the radio. When the keys are locked, the icon is displayed and all key presses are
ignored except for the PTT switch, SQL and the Keypad unlock sequence.
To lock the keypad:
Press the F key (the F icon will appear) then hold the key. The icon will appear on the display.
To cancel the keypad Lock:
Press the F key then hold the key unl the radio beeps. The icon will disappear.
Duplex Operaon
Duplex operaon allows the radio to transmit on a dierent frequency to that which it receives. This
allows operaon through repeater staons in your area. Repeaters automacally re-transmit your
signal over a much wider area, providing greatly increased range. The Duplex mode only works on
designated repeater channels 1 – 8 and 41 – 48. With Duplex selected on one of these channels,
your radio actually transmits 30 channels higher than it receives. For example, if Duplex is selected
on channel 1, your radio will receive on channel 1 but will transmit on channel 31.
Duplex can be enabled or disabled on individual channels. When Duplex is enabled on the selected
channel, is displayed.
The Duplex mode is set through the Menu. Please refer the menu opons in the Menu secon further in
this manual.
C H A N N E L
31
C H A N N E L
1
C H A N N E L
1
C H A N N E L
31
V E H I C L E
R E P E AT E R
O P E R A T I O N
V E H I C L E
R E P E AT E R
S T A T IO N
Figure 1 - Simple/Duplex Range Comparison
the and
TX677 Instrucon Manual
12 June 2018
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20
50157
Content
When the squelch is open, the LED indicator on the upper edge of the radio will light green and the
and icons will appear on the display. During this me you will hear stac or hiss if the channel is
clear. Do not transmit if you hear any signals.
To close the squelch:
Briey press the SQL key again.
The squelch sensivity is preset in the Menu – Squelch Level seng (see Menu opons for more
details on seng the squelch sensivity).
Keypad Lock
The Keypad Lock disables the keys to prevent accidental key presses from changing the preferred
sengs of the radio. When the keys are locked, the icon is displayed and all key presses are
ignored except for the PTT switch, SQL and the Keypad unlock sequence.
To lock the keypad:
Press the F key (the F icon will appear) then hold the key. The icon will appear on the display.
To cancel the keypad Lock:
Press the F key then hold the key unl the radio beeps. The icon will disappear.
Duplex Operaon
Duplex operaon allows the radio to transmit on a dierent frequency to that which it receives. This
allows operaon through repeater staons in your area. Repeaters automacally re-transmit your
signal over a much wider area, providing greatly increased range. The Duplex mode only works on
designated repeater channels 1 – 8 and 41 – 48. With Duplex selected on one of these channels,
your radio actually transmits 30 channels higher than it receives. For example, if Duplex is selected
on channel 1, your radio will receive on channel 1 but will transmit on channel 31.
Duplex can be enabled or disabled on individual channels. When Duplex is enabled on the selected
channel, is displayed.
The Duplex mode is set through the Menu. Please refer the menu opons in the Menu secon further in
this manual.
C H A N N E L
31
C H A N N E L
1
C H A N N E L
1
C H A N N E L
31
V E H I C L E
R E P E AT E R
O P E R A T I O N
V E H I C L E
R E P E AT E R
S T A T IO N
Figure 1 - Simple/Duplex Range Comparison
icons will appear on the display. During this
time you will hear static or hiss if the channel is clear. Do not transmit if you hear
any signals.
To close the squelch:
Briey press the SQL key again.
Note: The squelch sensitivity is preset in the Menu – Squelch Level setting (see
Menu options for more details on setting the squelch sensitivity).