GME TX4400 User manual

TX4400 INSTRUCTION MANUAL PAGE 1
INSTRUCTION MANUAL
UHF CB RADIO
TX4400

PAGE 2 INSTRUCTION MANUAL TX4400
TABLE OF CONTENTS
GENERAL ..................................3
FEATURES .................................3
BASIC OPERATION .......................4
Front Panel Controls . . . . . . . . . . . . . . . . . . . . . . . . 4
Adjusting the Volume . . . . . . . . . . . . . . . . . . . . . . . 4
LCD Indicators .............................4
Squelch ..................................5
Monitoring Function . . . . . . . . . . . . . . . . . . . . . . . . 5
Selecting Channels . . . . . . . . . . . . . . . . . . . . . . . . . 5
Back Lighting ............................. 5
Duplex Switch ............................5
Priority Channel ...........................6
Signal Strength Meter . . . . . . . . . . . . . . . . . . . . . . . 6
SCANNING ................................6
Scan Groups ..............................6
Selecting a Scan Group . . . . . . . . . . . . . . . . . . . . . . 6
Programming Scan Channels . . . . . . . . . . . . . . . . . . 6
To Start Scanning ..........................7
Scanning in the Open Scan Mode . . . . . . . . . . . . . . 7
Ending the Scan ...........................7
Using the Group Scan Mode . . . . . . . . . . . . . . . . . . 7
Setting up the Group Scan . . . . . . . . . . . . . . . . . . . . 7
Scanning in the Group Scan Mode . . . . . . . . . . . . . 7
Ending the Scan ...........................8
Using the Group Scan as a Second Open Scan . . . . . 8
PROGRAMMING RECEIVE-ONLY CHANNELS . . 8
Activating the 'Programming' Mode . . . . . . . . . . . . 8
Programming the Receive-Only Channels . . . . . . . . . 9
Storing the Selected Frequency . . . . . . . . . . . . . . . . 9
Editing your Programmed Receive Channels . . . . . . 9
Disabling a Receive-Only Channel . . . . . . . . . . . . . . 9
Scanning ................................9
Receiving Selcalls on your Receive-Only Channels . 10
CTCSS .................................10
SELECTIVE CALLING .......................10
What is Selcall ............................10
Selcall Identification Number (Ident) . . . . . . . . . . . 10
Selcall Ident Names . . . . . . . . . . . . . . . . . . . . . . . . 10
The QUIET Mode (Q) . . . . . . . . . . . . . . . . . . . . . . . 10
Selcall Memories ..........................10
Entering, Storing and Sending Selcalls . . . . . . . . . . 11
Call Acknowledge .........................11
Storing Selcall Idents . . . . . . . . . . . . . . . . . . . . . . . 11
Recalling Selcall Idents from the Memory . . . . . . . . 11
Recalling Fast Dial Memories . . . . . . . . . . . . . . . . . . . . . 12
Naming your Selcall Idents . . . . . . . . . . . . . . . . . . . 12
Displaying ALPHA Names . . . . . . . . . . . . . . . . . . . 12
Entering and Storing a Selcall Name . . . . . . . . . . . 12
Receiving Selcalls . . . . . . . . . . . . . . . . . . . . . . . . . 12
Displaying the caller’s Ident or Name . . . . . . . . . . . 13
The Selcall Alert ...........................13
Cancelling the Selcall Alert . . . . . . . . . . . . . . . . . . . 13
Call Acknowledge Signal . . . . . . . . . . . . . . . . . . . . 13
QUIET MODE .............................. 13
Setting up the QUIET mode . . . . . . . . . . . . . . . . . . 13
Tagging individual channels for QUIET operation . . 13
Removing the QUIET Tag from Individual Channels . 13
Activating the QUIET Mode . . . . . . . . . . . . . . . . . . 13
De-activating the QUIET Mode . . . . . . . . . . . . . . . . 14
Receiving Signals in the QUIET Mode . . . . . . . . . . . 14
Scanning in the QUIET Mode . . . . . . . . . . . . . . . . . 14
Receiving Signals while Scanning in the QUIET Mode . . 14
GROUP CALLING ..........................14
Programming and Sending Group Calls . . . . . . . . . 15
Sending the Selcall Ident . . . . . . . . . . . . . . . . . . . . 15
Call Acknowledge in Group Mode . . . . . . . . . . . . . 15
Storing Group Call Idents . . . . . . . . . . . . . . . . . . . . 15
Receiving Group Calls . . . . . . . . . . . . . . . . . . . . . . 15
PAGER (TRANSPOND) MODE ...............15
Overview ...............................15
Selecting the Paging Channel . . . . . . . . . . . . . . . . 15
Setting the Paging Ident . . . . . . . . . . . . . . . . . . . . 15
Monitoring a Single channel while in Page Mode . . 16
Scanning in the Page Mode . . . . . . . . . . . . . . . . . . 16
Using Open Scan ..........................16
Using Group Scan .........................16
Using the QUIET Mode . . . . . . . . . . . . . . . . . . . . . 16
Returning a Call in the PAGE Mode . . . . . . . . . . . . 17
Deactivating the Page Mode . . . . . . . . . . . . . . . . . 17
CTCSS ....................................17
Monitor Function ..........................17
Selecting the required CTCSS Tones . . . . . . . . . . . . 17
Enabling the CTCSS function on a channel . . . . . . . 18
CTCSS Tone Frequency Chart . . . . . . . . . . . . . . . . . 18
HOW TO DISABLE FEATURES ............... 18
REPEATERS ................................18
INSTALLATION .............................19
Fitting the microphone . . . . . . . . . . . . . . . . . . . . . 20

TX4400 INSTRUCTION MANUAL PAGE 3
Rear microphone connection . . . . . . . . . . . . . . . . . 20
DC Power Connection . . . . . . . . . . . . . . . . . . . . . . 21
High Voltage Warning . . . . . . . . . . . . . . . . . . . . . . 21
Antenna Connection . . . . . . . . . . . . . . . . . . . . . . . 21
SPECIFICATIONS ..........................22
Warranty ...............................24
GENERAL
Your GME TX4400 radio is Australian designed and built
and is one of the most advanced UHF Citizen Band radios
available.
The TX4400 combines the very latest in electronic
hardware with the most up-to-date computer aided
design and manufacturing techniques to produce an
extremely versatile mobile radio with outstanding
specifications and performance.
The TX4400's DIN sized case allows it to be conveniently
installed into a dashboard or console and its strong diecast
aluminium chassis makes it the most robust radio of its
kind. With just three rotary controls and five touch keys,
the TX4400's extensive features are easy to operate.
FEATURES
• Microprocessor Controlled Frequency Synthesiser:
Allows user programmable control of scanning, Selcall,
CTCSS, channel memories and selected feature options.
• Permanent Memory: Retains all user settings in non-
volatile memory even when the power has been removed.
• Programmable Scan Function: Scans up to 40 user
programmable channels with both Group and Open scan
functions available.
• User Programmable Receive-Only Channels: Use
the TX4400's front panel controls to program up to 20
of your own receive-only channels in the 465-485 MHz
frequency range.
• In-Built CTCSS: User selectable Continuous Tone Coded
Squelch System provides quiet channel operation (can be
enabled or disabled on individual channels).
• In-Built Selcall: Selective Calling of individuals or
groups with four or five digit ANI and fully user-adjustable
5 tone transmitted Selcall Ident. Also allows alphanumeric
naming of up to 10 Idents for easier caller identification.
• Front Facing Speaker: Projects the sound forward for
greater clarity.
• 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.
• Priority Channel: A user programmable priority channel
feature allows your working or local repeater channel to
be instantly recalled at the press of a button.
• Large High Contrast Liquid Crystal Display: Fully
detailed LCD with large characters provides a visual
indication of the selected channel and all selected
functions at a glance. LED backlit for viewing at night
with DIM function.
• Quiet Mode: Selectable on individual channels,
the Quiet mode prevents incoming signals from being
heard on selected channels unless preceded by your
Selcall code.
• Unique Page (Transpond) mode: Allows you to
transfer an incoming Selcall to another radio if your
radio is unattended.
• Feature Disabling Function: Allows Scanning, Squelch,
Duplex, Priority, Channel selection and CTCSS features
to be enabled or disabled to make the radio simpler to
operate.
• Overvoltage Protection: Special overvoltage detection
circuitry protects the radio and warns of excessive voltage
conditions by flashing the display.
• Microphone Connection: Optional rear connecting
microphone facility allows for flexible installation.
• 20 Additional Channels: Room for an additional 20
Dealer programmable 'receive-only' channels.
• Australian Made: The TX4400 has been totally
designed and manufactured in Gladesville NSW to meet
the demanding needs of the Australian community.
THE FOLLOWING ITEMS ARE INCLUDED WITH YOUR TX4400
• TX4400 Radio
• Mounting Cradle
• Instruction Manual
• MC509B Microphone
• Microphone Clip
• DC Lead
• Screw Pack
If any items are missing or
damaged, please contact your
retailer or place of purchase.

PAGE 4 INSTRUCTION MANUAL TX4400
Duplex Mode.
Function: ALPHA
Rotate for Channel Selection
Push for Priority Channel Display
Rotate for Volume
Rotate for Squelch
Press for Monitor
Function
SCAN Selector.
Function: DIM
OPEN/GROUP Scan.
Function: PAGE
QUIET Mode.
Function: SILENT
Press first to access
Functions
FRONT PANEL CONTROLS
Channel Display
Selcall memory Location
QUIET Tag
Transmit
Indicator
Scan
Indicator
Duplex
Indicator
Selcall
Call Mode
CTCSS
Indicator
Selcall Ident Display
ALPHA name Display
QUIET Mode
Channel
Memory
Indicator
Receive
Indicator
BASIC OPERATION
Rotate the Volume control clockwise past
the ‘click’ to turn the TX4400 ON. Adjust the
volume control for a comfortable listening
level. If no sound is heard, rotate the Squelch
knob fully counter-clockwise to temporarily
un-mute the radio. You can now adjust the
volume by listening to the receiver's background
noise. When finished, rotate the Squelch knob
clockwise again to re-mute the radio
LCD INDICATORS
ADJUSTING THE VOLUME

TX4400 INSTRUCTION MANUAL PAGE 5
SQUELCH
The Squelch is used to eliminate any annoying background
noise when there are no signals present. The TX4400
features a continuously variable Squelch control system
allowing the user to set the Squelch for optimum
performance.
To adjust the Squelch, first rotate the Squelch control
fully counter-clockwise until the background noise is
heard and the ‘BUSY’ indicator is displayed on the LCD.
Now advance the Squelch control slowly clockwise until
the noise is just extinguished and the ‘BUSY’ indicator
disappears. At this point the receiver will remain quiet while
no signals are present, but an incoming signal will override
the Squelch and be heard in the speaker. As the Squelch
control is advanced further clockwise the Squelch action is
progressively increased and stronger incoming signals are
needed to overcome it.
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 turn the
Squelch control fully counter-clockwise to open the squelch,
which will allow the signal to be heard clearly.
MONITORING FUNCTION (MON)
When using CTCSS, press the Squelch knob to temporarily
open the Squelch to allow you to listen for signals on the
channel. For a full description of the MON function refer to
the CTCSS section.
SELECTING CHANNELS
Select the required channel by rotating the channel selector
knob. Rotate the knob clockwise to select higher channels
and counter-clockwise to select lower channels. The selected
channel is displayed in large numbers on the LCD.
BACK LIGHTING
The Liquid Crystal Display and function keys are backlit for
easy viewing at night or in low light situations. The LED
back lighting is on at all times while the TX4400 is
turned on.
To DIM the backlighting, briefly press the F key, followed
by the DIM key. Repeat the sequence to restore the
backlighting to full brightness.
DUPLEX SWITCH
Duplex operation allows the TX4400 to transmit on a
different frequency to that which it receives. This allows
operation through any repeater stations in your area.
Repeaters automatically re-transmit your signal over a
wider area, providing greatly increased range.
The Duplex function operates only on channels 1 - 8.
When Duplex is selected on one of these channels, the
TX4400 receives on that channel but actually transmits
30 channels higher.
Channel
Selected
1 2 3 4 5 6 7 8
Receive
Channel
1 2 3 4 5 6 7 8
Transmit
Channel
31 32 33 34 35 36 37 38
The TX4400 allows you to select duplex operation on
individual channels. This is particularly useful in country
areas where there may only be one or two repeaters. The
unused repeater channels can then be used for normal
simplex or direct radio-to-radio communications.
To select Duplex on individual channels:
1. Select the required channel 1 - 8.
2. Briefly press the DUP key. ‘DUP’ will appear on the
display accompanied by a high beep.
To remove Duplex from a channel:
1. Select the required channel 1 - 8. ‘DUP’ will be visible on
the display.
2. Briefly press the DUP key. ‘DUP’ will disappear from the
display accompanied by a low beep.
MON

PAGE 6 INSTRUCTION MANUAL TX4400
PRIORITY CHANNEL
The Priority Channel feature allows you
to store one of the 40 Channels in the
TX4400 as a priority Channel that can
be instantly recalled at the press of a
key. This can be used to provide instant
access to your working Channel or
your Local Repeater Channel.
To Store Priority Channel:
1. Select the required Channel.
2. Press and hold the Channel Knob. The Channel display
will flash for a moment then a high beep will be heard as
the selected Channel is stored.
To recall the Priority Channel:
Briefly press the Channel Knob. The TX4400 will
immediately switch to the Priority Channel accompanied by
a high beep.
SIGNAL STRENGTH METER
The TX4400 has a digital signal strength meter that is
displayed on the LCD. When in the normal receive mode
(scan not selected) the received signal strength is displayed
as numbers from 0 to 9 (with 9 being the strongest) on the
lower right of the display.
SCANNING
The TX4400 is provided with a SCAN function to allow
groups of user programmable Channels to be scanned for
signals. Channels can be scanned at up to 10 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.
SCAN GROUPS
The TX4400 features two scan groups -
Open Scan and Group Scan. Open Scan allows any of the
fitted Channels to be scanned for activity in an ascending
sequence (i.e. from the lowest Channel to the highest). If
a busy Channel is found, scanning will pause to allow the
signal to be heard. Once the Channel has been clear for 5
seconds, scanning will resume automatically.
Example: Scanning Channels 1 - 8 in Open Scan
Group Scan also allows any of the fitted Channels to
be scanned for activity in an ascending sequence, but in
addition, it also inserts your Priority Channel into the scan
sequence. This means that your Priority Channel will be
monitored regularly while scanning to ensure that no calls
are missed. Any signals received on your Priority Channel
will have priority over any signals received on the
other Channels.
Example: Scanning Channels 1 - 8 with Priority
Channel 20 in Group Scan
SELECTING A SCAN GROUP
The current scan group is shown on the display as OS for
Open Scan or GS for Group Scan.
Open scan mode Group Scan Mode
To change the selected scan group, briefly press the OS/GS
key. A beep will be heard and the display will change to
reflect the scan group you have selected.
PROGRAMMING SCAN CHANNELS
Your TX4400 is supplied with all 40 UHF CB Channels
programmed into the Open Scan memory. Any Channels
not required can be removed as necessary. The Group
Scan memory is empty by default and you will need to add
Channels to it before use.
To add or remove Channels from either scan memory:
1. Check that the radio is not already scanning. If it is,
briefly press the SCAN key to cancel the scan function.
2. Select the required scan group by pressing the
OS/GS key.
3. Select the required Channel by rotating the
Channel selector.
Channel is in Memory
1- 2 - 3 - 4 - 20 - 5 - 6 - 7 - 8 - 20
1- 2 - 3 - 4 - 5 - 6 - 7 - 8

TX4400 INSTRUCTION MANUAL PAGE 7
• I f ‘M’ is visible to right of the display, the selected
Channel is presently in the scan memory. It can be
removed by holding the SCAN key in for a few seconds
until a low beep is heard. ‘M’ will then disappear
indicating the Channel is no longer in memory.
• If ‘M’ is not visible to right of the display, then the
selected Channel is not in the memory. To add it, hold
the SCAN key in for a few seconds until a high beep is
heard. ‘M’ will now appear to the right of the display.
4. Repeat step 3 to add or remove other Channels in the
scan memory.
TO START SCANNING
To scan in the selected scan mode, briefly press the SCAN
key. A high beep will be heard, ‘SCAN’ will appear in the
display and the radio will begin scanning.
Note: If there are less than 2 Channels programmed in the
scan memory in Open Scan or one Channel in Group Scan
when you press the SCAN key, a long low beep will be
heard and the command will be ignored.
SCANNING IN THE OPEN SCAN MODE
• 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 pauses on a busy Channel and you don't
wish to listen to that conversation, briefly press the CALL
button on top of the microphone. The radio will skip
over that Channel and resume scanning from the next
Channel in the sequence.
• To transmit while paused on a busy Channel, simply
press the Push-To-Talk (PTT) button on the microphone.
The SCAN mode will be put on hold and the radio will
stay on that Channel. You can now converse on that
Channel in the usual way. When you have finished your
conversation, briefly press the CALL button to
resume scanning.
• If your radio is paused on a busy Channel and you wish
to remain there, briefly press the SCAN key. The radio
will exit the Scan mode and remain on the busy Channel.
• If your radio is scanning and you need to use your
Priority Channel (for an urgent call or an emergency),
briefly press the Channel knob. The Scan mode will be
cancelled and the radio will jump straight to the
Priority Channel.
Note: In the Open Scan mode your TX4400 will not allow
you to transmit while it is scanning. If the PTT button is
pressed while scanning, the radio will give a low beep and
will ignore the command. Your radio will only transmit while
it is paused on a busy Channel.
ENDING THE SCAN
To stop scanning, briefly press the SCAN key. A low beep
will be heard and ‘SCAN’ will disappear from the display. As
long as the radio was not on a busy Channel, it will return
to the last Channel you selected, otherwise it will stay on
the busy Channel.
USING THE GROUP SCAN MODE
Group Scan allows you to transmit and receive normally
on your priority (working) Channel, but between breaks in
the conversation, the TX4400 will scan and listen to several
other Channels. The receiver will continue to scan the other
Channels ONLY WHILE THERE ARE NO SIGNALS ON
THE PRIORITY Channel.
If a signal appears on the priority Channel it will override
any signals being received on any of the other Channels. In
addition, if you press the PTT switch on the microphone at
any time, the radio will transmit on the priority Channel in
the usual way.
SETTING UP THE GROUP SCAN
To setup your radio for Group Scan:
1. Select the Group Scan mode by pressing the OS/GS key
so that ‘GS’ is displayed.
2. Program your Priority Channel memory with your
preferred working Channel.
3. Program the required ‘other’ Channels into your Group
Scan memory.
SCANNING IN THE GROUP SCAN MODE
To scan in the Group Scan mode, briefly press the SCAN
key. A high beep will be heard, ‘SCAN’ will appear in the
display and the radio will begin scanning.
Note: If there are no Channels programmed in the Group
Scan memory when you press the SCAN key, a low beep
will be heard and the command will be ignored.
When scanning, the TX4400 scans all the Channels
programmed into the Group Scan memory, with the priority
Channel being scanned after every fourth Channel.
• If a signal is heard on a scanned Channel, scanning
will pause on that Channel and remain there for as
long as the Channel is busy, and for 5 seconds after the
Channel has cleared, as long as there are no signals on
the priority Channel. During this time the receiver will
continue to check the priority Channel for signals every
2 seconds, resulting in a series of small 'breaks' in the

PAGE 8 INSTRUCTION MANUAL TX4400
reception of the 'paused' Channel. If no signals are heard
after 5 seconds, the radio will resume scanning.
• If a signal appears on the priority Channel at any time
(even when paused on a scan Channel) the receiver will
switch straight to the priority Channel and will stay there
for as long as the Channel is busy. During this time you
can transmit on the priority Channel in the usual way.
Once there has been no activity on the priority Channel
for 5 seconds, the radio will resume scanning the other
Channels.
• To talk on the priority (working) Channel AT ANY TIME,
simply press the PTT switch on the microphone. The radio
will switch straight to the priority Channel. When you
have finished your conversation and there has been no
further activity on the priority Channel for 5 seconds, the
radio will resume scanning the other Channels.
• If your radio pauses on a busy Channel and you don't
wish to listen to that conversation, briefly press the CALL
button on top of the microphone. The radio will skip
over that Channel and resume scanning from the next
Channel in the sequence.
• If your radio is paused on a busy Channel and you wish
to remain there, briefly press the SCAN key. The radio
will exit the Scan mode and remain on the busy Channel.
Note that the radio will no longer be monitoring the
Priority Channel (unless it is the busy Channel). To
resume scanning, press the SCAN key again.
• To go directly to the Priority Channel, briefly press the
Channel knob. The radio will exit the Scan function.
ENDING THE SCAN
To cancel the Group Scan mode, briefly press the SCAN
key. A low beep will be heard and ‘SCAN’ will disappear
from the display. If the radio was on a busy Channel it will
remain on that Channel, otherwise it will return to the
priority Channel.
USING THE GROUP SCAN AS A SECOND
OPEN SCAN
There may be applications where you have no need for
the priority Channel and would prefer to have two Open
Scan modes with separate Channel groups in each. This
would allow you to scan either Channel group without the
interruption caused by monitoring a priority Channel.
Your TX4400 can be Dealer programmed to convert the
Group Scan function into a second Open Scan mode. If
you would prefer this feature over the present Group Scan
option you should contact your GME Dealer to arrange for
this feature to be enabled.
When the second Open Scan mode is enabled, the original
Open Scan mode becomes Scan 1 while the new additional
Open Scan mode becomes Scan 2. To select the required
scan mode briefly press the OS/GS key. S1 is displayed for
Scan 1 and S2 for Scan 2.
The two Open Scan modes are identical in operation. To
program and operate each Open Scan mode refer to the
section earlier on Open Scan
Note: Enabling or disabling the second Open Scan mode is
not a user selectable option. Once enabled by your Dealer,
the additional Open Scan mode becomes a permanent part
of the TX4400’s features and replaces the standard Group
Scan function. If you find later that you need the Group
Scan function re-enabled, you will need to return your
TX4400 to your Dealer.
PROGRAMMING RECEIVE-ONLY CHANNELS
Your TX4400 has provision for an extra 20 Receive-Only
Channels, in addition to the standard 40 UHF CB Channels
provided. These extra Channels can be user programmed
into Channel positions 41 through 60, within the frequency
range of 465 to 485 MHz. Frequencies are selected in 25
kHz steps. Note that the standard CB Channels 1 through
40 are fixed and cannot be altered.
ACTIVATING THE 'PROGRAMMING'
MODE
Your TX4400 is supplied from the factory with the Receive-
Only Channels deactivated. You can activate and program
them yourself as follows:
1. Turn the radio OFF.
2. Press and hold the Channel selector while turning the
radio ON.
3. Release the Channel selector. The radio is now in
'Programming' Mode.
Rotate the Channel selector clockwise past Channel 40.
You will now find that you can select additional Channel
numbers 41 through 60. Initially, these Channels will have
no frequencies installed in them and are in effect, turned
OFF. Each individual Channel will need to be turned ON
and programmed with the receive frequency of your choice.
Open Scan 1 Open Scan 2

TX4400 INSTRUCTION MANUAL PAGE 9
PROGRAMMING THE RECEIVE-ONLY
CHANNELS
Note: When programming, rotate the Channel selector
SLOWLY. If you rotate the Channel selector too quickly, the
internal counter will not be able to keep up with you and
the frequency will not advance.
1. Select the Channel number that you wish to program
(Channels 41 to 60).
2. Press and HOLD the Channel selector until the radio
beeps (about 2 seconds). 'OFF' will appear to the right
of the Channel number indicating there is no
frequency installed.
3. SLOWLY rotate the Channel selector CLOCKWISE one
click to activate frequency programming. 'OFF' will
disappear and '46500' will be displayed indicating a
frequency of 465.000 MHz (the lower end of the radio's
frequency range).
Note: Because the display is only able to show the first 5
digits of the frequency, the last 'kHz' digit is not displayed.
However, since the frequency can only be selected in 25 kHz
steps, it is easy to 'guess' the actual frequency since the
missing digit will always alternate between
0 and 5 kHz.
e.g.
4. Rotate the Channel selector SLOWLY in a clockwise or
counter-clockwise direction to set the desired frequency.
Each click of the Channel selector will advance or reduce
the frequency by 25 kHz. The maximum allowable
frequency you can select is 485.000 MHz.
Note: The radio is able to receive signals on the displayed
frequency the instant you select it. This feature allows
you to manually tune through the frequencies looking for
signals or active Channels in your area.
5. To quickly step through the MHz, briefly press the
Channel selector. A high beep will be heard. Now
rotating the Channel selector will adjust only the MHz
section of the frequency.
6. To return to normal 25 kHz frequency steps press the
Channel selector again. A low beep will be heard.
STORING THE SELECTED FREQUENCY
7. Once the required frequency is displayed, press and
HOLD the Channel selector for about 1.5 seconds. The
frequency will flash, then the radio will beep indicating
the frequency has been stored.
To program other frequencies, repeat steps 1 to 7 above.
Once you have programmed the required Channels, switch
the radio OFF to exit the programming mode.
Now when you switch the radio ON, you will be able
to select the usual 40 CB Channels plus the additional
Channels you have programmed.
Note: There is no provision to transmit on the Receive-Only
Channels. If the PTT switch is pressed on a Receive-Only
Channel, the radio will emit a low beep.
EDITING YOUR PROGRAMMED RECEIVE
CHANNELS
The Receive-Only Channels you have programmed can
be edited at any time. You do not need to re-enter the
programming mode.
To edit a Receive-Only Channel:
1. Select the required Channel.
2. Press and hold the Channel selector until the radio
beeps (about 2 seconds). The frequency stored in that
Channel will be displayed.
3. Slowly rotate the Channel selector to select a new
frequency.
4. To store the new frequency, press and hold the Channel
selector until the radio beeps.
DISABLING A RECEIVE-ONLY CHANNEL
If you no longer wish to display a Receive-Only Channel,
you can switch it OFF so the Channel number no longer
appears when selecting Channels.
1. Select the receive-only Channel that you wish to disable.
2. Press and hold the Channel selector until the radio
beeps. The frequency will be displayed.
3. Briefly press the Channel selector to select the MHz
frequency stepping mode. This will allow faster frequency
changing.
4. Slowly rotate the Channel selector counter clockwise to
reduce the frequency until OFF is displayed.
5. Press and hold the Channel selector to store the new
setting.
SCANNING
The additional receive Channels can be programmed into
your scan groups in the same way as your normal CB
Channels. Simply select the required receive-only Channel,
select the required scan group (Open or Group Scan), then
press and hold the SCAN button until the radio beeps.
Display Frequency
46800 468.000 MHz
46802 468.025 MHz
46805 468.050 MHz
46807 468.075 MHz
46810 468.100 MHz

PAGE 10 INSTRUCTION MANUAL TX4400
'M’ will be displayed on that Channel to indicate that it is
in the scan memory. For more details, see the section on
'Scanning' in this manual.
RECEIVING SELCALLS ON YOUR
RECEIVE-ONLY CHANNELS
If your TX4400 receives its Selcall code on a Receive-Only
Channel, it will respond in the usual way, except that it
cannot automatically transmit two quick beeps back to the
caller since there is no transmit frequency. For more details,
see the section on 'Selcall' in this manual.
Using the PAGE function with your Receive-Only Channels.
You can monitor Receive-Only Channels with the Page
function in the same way as you can with CB Channels. If
your Selcall is received on the Receive-Only Channel your
radio will page you the same as it would if the call was
received on a normal CB Channel, except that it cannot
respond to the caller with two quick beeps since there is no
transmit frequency. For more details, see the 'Page Mode'
section on in this manual.
CTCSS
There is no provision for CTCSS operation on the Receive-
Only Channels.
SELECTIVE CALLING
WHAT IS SELCALL
Your TX4400 has a Selective Calling (Selcall) system that
operates like a telephone. Your radio has been programmed
with its own unique Selcall Identification number. When
this number is called by another radio, your TX4400 will
beep to alert you.
If you do not want to hear any other activity while waiting
on a Channel, you can push the QUIET key. The radio will
then remain quiet to all incoming signals until your number
is called. Your radio allows you to store up to ten of your
most frequently called numbers in memory. Each number
can be labelled with a 5-letter name for easy identification.
SELCALL IDENTIFICATION NUMBER
(IDENT)
Your TX4400 is factory programmed with its own unique
Ident. This number identifies your radio from others in your
area. You will need to make your Ident known to anyone
who may need to call you with Selcall. Whenever your
TX4400 hears a Selcall signal, it compares the incoming
Ident with it’s own. If the two Idents match, the radio
knows it is being called and sounds an alarm to alert you
to the call.
The Selcall Ident for your radio is printed on the label on
the rear panel and is also stored in Selcall memory 12
(see section below on programming the Selcall memories).
The Ident is the last 5 digits of the radio's serial number.
Note: The Selcall Ident is also displayed to the right of
the Channel number for one second each time the radio
is turned on. Although your radio's Selcall Ident is pre-
programmed at the factory, you can arrange to have your
Dealer change it if required.
SELCALL IDENT NAMES
The TX4400 allows you to name all 10 of the Selcall Idents
stored in memory using a 5 character word. The name can
then be stored in memory with the Ident making it easier to
identify whose Ident you are recalling from the memory. In
addition, if an incoming Selcall matches one of the Idents
stored in the memory, its name can be displayed to make it
easier for you to identify the caller.
THE QUIET MODE (Q)
Your TX4400 can be set to listen on a busy Channel but not
allow any sound to reach the speaker UNLESS it receives its
own Selcall Ident. In this way, your radio can monitor a busy
Channel without disturbing you, but still let you know when
you are being called.
• The QUIET mode overrides the normal Squelch system
to ensure that the radio remains quiet even when the
Channel is busy or the Squelch is ‘opened’ with the
Squelch control. When QUIET is set, you may see 'BUSY'
appear on the display and signal strengths appear on the
display indicating the Channel is being used. However,
unless someone transmits your Selcall Ident, nothing will
be heard in the speaker.
• The QUIET mode can be set to work on specific Channels
i.e. some Channels can be set to remain Quiet while
others can remain Open to all incoming signals.
When a signal containing your Selcall Ident is received, the
QUIET mode is deactivated and an alarm sounds to alert
you to the call. You can then converse normally on
the Channel.
Note: Setting the QUIET mode is not mandatory. You can
still use Selcall on any Channel whether the QUIET mode is
set or not.
SELCALL MEMORIES
Your TX4400 is fitted with 13 Selcall Ident memories.
• Memory locations 1 - 10 are available for normal use
and can be programmed with your favourite Selcall
Idents and Alpha Names.
• Memory locations 11 - 13 are reserved for use by the
radio as follows:

TX4400 INSTRUCTION MANUAL PAGE 11
Memory location 11 holds the Selcall Ident for the Pager
function. See the ‘Page Mode’ section for more details on this
feature. When in ALPHA mode, this memory displays ‘PAGER’.
Memory location 12 holds the last-sent or received
Selcall Ident. Whenever you send or receive a Selcall, the
Ident is automatically stored in this location allowing you
to easily recall it and resend it. When in ALPHA mode, this
memory displays ‘LAST’.
Memory location 13 contains the radio’s own Selcall
Ident. If you need to give your Selcall Ident to someone but
can’t remember it, you can recall it from this location. When
in ALPHA mode, this memory displays ‘RADIO’.
The memories can be viewed by briefly pressing the CALL
button on the microphone, then rotating the
Channel switch.
ENTERING, STORING AND SENDING
SELCALLS
Use the following procedure to enter and send a Selcall.
1. Press the CALL button on the microphone. ‘CALL TO’ is
displayed, along with a memory location on the left and
an associated 5 digit Selcall Ident on the lower right.
2. Enter the required Selcall ident as follows:
(a) Briefly press the Channel knob. The right-hand digit
of the Selcall Ident will flash.
(b) Rotate the Channel knob to select the required
number in the flashing digit position.
(c) Briefly press the Channel knob again to select the
next digit position.
(d) Repeat steps (b) and (c) to enter all 5 digits
as required.
3. Now press and hold the CALL button to send the Ident.
CALL ACKNOWLEDGE
If your Selcall transmission is successful, the radio you called
should respond with a 'call acknowledge' signal - usually
two quick beeps. This will confirm to you that the radio you
called is now alerting its user to your signal.
STORING SELCALL IDENTS
Your TX4400 is fitted with 10 user programmable Selcall
Ident memories, allowing you to store up to 10 frequently
used Selcall Idents. The memories are accessed by pressing
the CALL button on the microphone then rotating the
Channel switch.
Note: Memory locations 1 - 4 are ‘Fast Dial’ memories.
Once programmed they can be quickly recalled using the
front panel keys. If you wish to make use of this feature,
you should program your four most frequently used Selcall
idents into the first four memory locations. For details on
using these ‘Fast Dial’ keys, see section below on
‘Recalling Fast Dial Memories’.
To Store a Selcall Ident in memory
1. Press the CALL button on the microphone to select the
‘CALL TO’ mode. ‘CALL TO’ is displayed along with a
memory location number on the left and an associated 5
digit Selcall Ident on the right.
2. Rotate the Channel switch to select the Selcall memory
that you wish to programme (only locations 1 - 10 are
available for user programming).
Note: If the radio displays letters instead of numbers in
the Selcall Ident position, your radio is in ALPHA mode. To
switch back to Ident mode, briefly press the F key then the
ALPHA key.
3. With the required memory location displayed, enter the
Selcall ident as follows:
(a) Briefly press the Channel knob. The right-hand digit
of the Selcall Ident will flash.
(b) Rotate the Channel knob to select the required
number in the flashing digit position.
(c) Briefly press the Channel knob again to select the
next digit position.
(d) Repeat steps (b) and (c) to program all 5 digits as
required.
3. Now press and hold the Channel knob. The Selcall Ident
will flash for a few seconds, then the radio will beep as
the Ident is stored.
RECALLING SELCALL IDENTS FROM THE
MEMORY
1. Briefly press the CALL button on the microphone to
select the ‘CALL TO’ mode.
2. Rotate the Channel knob to select the required memory
location. The Selcall ident stored in that memory will be
displayed.
3. When the required Selcall Memory is displayed, press and
hold the CALL button to send the Ident.
Memory Location CALL TO
Mode selected
Selcall Ident

PAGE 12 INSTRUCTION MANUAL TX4400
RECALLING FAST DIAL MEMORIES
Memory locations 1 - 4 are ‘Fast Dial’ memories. Once
programmed they can be quickly recalled using the front
panel keys. To make use of this feature, you should program
your four most frequently used Selcall idents into the first
four memory locations.
To recall an Ident from the Fast Dial memories
1. Briefly press the CALL button on the microphone to
select the ‘CALL TO’ mode.
2. Press one of the four front panel keys shown below.
3. When the required Selcall Memory is displayed, press and
hold the CALL button to send the Ident.
NAMING YOUR SELCALL IDENTS
The TX4400 allows you to name each Selcall Ident using
a 5 character ALPHA name. The name is stored in memory
along with the Ident making it easier to identify whose
Ident you are recalling from the memory. If an incoming
Selcall matches one of those in your radio's memory, the
name can be displayed instead of the Selcall Ident.
DISPLAYING ALPHA NAMES
To display the Selcall's ALPHA Name, you must have the
radio's ALPHA display mode selected. To select the ALPHA
display mode, briefly press the F key followed by the
ALPHA key. The TX4400 will give a HIGH beep. To return
to the IDENT display mode repeat the key press sequence. A
LOW beep will confirm the IDENT display mode is selected.
Note: The normal Channel display will give no indication of
which display mode is selected. Only when displaying Idents
will it become obvious which mode is presently selected.
ENTERING AND STORING A SELCALL
NAME
Before adding an ALPHA Name to a Selcall Ident, you
should first store the required Ident in memory as described
above under ‘STORING SELCALL IDENTS’.
1. Briefly press the CALL button on the microphone. The
‘CALL TO’ mode will be selected and the last-sent
Selcall memory location will be displayed. The large
numbers to the left show the memory number while
the five characters under the 'CALL TO ' icon represent
the ALPHA name associated with the Selcall stored in
that memory. If the Selcall Ident is visible, briefly press
the F key followed by the ALPHA key to select the
ALPHA mode (a high beep indicates the ALPHA mode
is selected).
2. Rotate the Channel switch to select the Selcall memory
that you wish to programme (only locations 1 - 10 are
available for user programming).
3. With the required memory location displayed, enter the
required ALPHA name as follows:
(a) Briefly press the Channel knob. The right-hand
character of the ALPHA name will flash.
(b) Rotate the Channel knob to select the required
character in the flashing character position.
The following characters are available:
c) Briefly press the Channel knob again to select the
next character position.
d) Repeat steps (b) and (c) to program all 5 characters
as required.
4. Now press and hold the Channel knob. The ALPHA
name will flash for a few seconds, then the radio will
beep as the name is stored.
Repeat the procedure to add ALPHA names to any other
Selcall Idents stored in memory.
To exit the 'CALL TO' mode, briefly press the CALL button.
The radio will return to normal operation.
The radio can be left in the ALPHA display mode so that
an incoming Selcall matching one of those in the radio's
memory will display the name associated with that Selcall
Ident instead of the Ident itself. Any Selcall's not matching
those in the memory will display the normal Ident in the
usual way.
RECEIVING SELCALLS
When your TX4400 receives its own Selcall number, it will
beep to alert you to the call. In addition, it will cancel the
QUIET mode (if selected) and display the Ident or ALPHA
name of the caller.
Memory 1 Memory 2 Memory 3 Memory 4
Memory Location ALPHA Name
* + - 0 1 2 3 4 5 6 7 8 9 A B C D E F
G H I J K L M N O P Q R S T U V W X Y Z
<SPACE>

TX4400 INSTRUCTION MANUAL PAGE 13
DISPLAYING THE CALLER’S IDENT OR
NAME
Whenever your TX4400 receives it’s own Selcall Ident, the
words ‘CALL FROM' will appear on the display along with
the callers Selcall Ident or ALPHA name to inform you of
the identity of the person calling. To switch between Selcall
Idents and ALPHA Names briefly press the F key followed by
the ALPHA key.
THE SELCALL ALERT
When your TX4400 receives it’s Selcall Ident, an alarm will
sound in the speaker to alert you to the call. Initially the
alarm will beep urgently at 2 beeps per second for around
10 seconds then slow to around 1 beep every 3 seconds
if the call is not answered. It will then continue to beep
indefinitely until you cancel it.
CANCELLING THE SELCALL ALERT
Pressing just about any key on the TX4400 will cancel the
Selcall Alarm. However, the following are the recommended
methods.
• If you want to cancel the Alarm and listen on
the channel:
Briefly press the QUIET key. The alarm will stop beeping
and the channel will remain open to any
incoming signals.
• If you want to Cancel the Alarm and talk on
the channel:
Press the PTT switch on the microphone and talk in the
usual way. The alarm will be cancelled and the channel
will be open for normal communication.
• If you want to Recall the Callers Ident and return
the call:
Briefly press the CALL button on the microphone. The
radio will enter the 'CALL TO' mode and will insert the
callers Ident or ALPHA Name ready for sending. Now
simply press and hold the CALL button for a few seconds
until the radio beeps. The Selcall will be sent to the caller.
CALL ACKNOWLEDGE SIGNAL
When your TX4400 receives its own Selcall Ident, it
automatically responds by transmitting an 'acknowledge'
signal back to the caller. This informs the caller that their
Selcall transmission has been successful and that your radio
is alerting you to their call. The 'acknowledge' signal is
heard at the callers end as two quick beeps.
QUIET MODE
The QUIET mode mutes the TX4400's receiver to prevent
any incoming signals from being heard in the speaker until
your Selcall Ident is received. In this way you can monitor a
busy channel for personal calls without being disturbed by
unwanted signals.
If your Selcall Ident is received, the QUIET mode is then
cancelled and all incoming signals are heard in the speaker.
SETTING UP THE QUIET MODE
To setup the QUIET mode you must first 'tag' the channels
that you want to stay Quiet, then activate the QUIET mode.
Once the QUIET mode is activated, the channels you have
tagged will remain Quiet to all incoming signals unless your
Selcall Ident is received. Channels not tagged will remain
open to all signals and will operate normally.
TAGGING INDIVIDUAL CHANNELS FOR
QUIET OPERATION
1. Select the required channel using the Channel switch.
2. Press and HOLD the QUIET key until a high beep is
heard. ‘Q’ will appear on the far right of the display
indicating the selected channel is now tagged for
Quiet operation.
REMOVING THE QUIET TAG FROM
INDIVIDUAL CHANNELS
1. Select a channel that has been tagged for Quiet
operation. ‘Q’ will be displayed.
2. Now press and hold the QUIET key until a low beep is
heard. ‘Q’ will disappear indicating this channel is no
longer tagged for Quiet operation.
ACTIVATING THE QUIET MODE
1. First, select a channel that has been tagged for Quiet
operation (you cannot activate the Quiet mode unless
you have selected a 'tagged' channel). ‘Q’ will
be displayed
2. Now briefly press the QUIET key. 'QUIET' will appear at
the top of the display.
Now all channels tagged for Quiet operation will be
operating in the Quiet Mode.
Indicates selected Channel
is TAGGED for QUIET
Operation
Indicates QUIET mode
is Active

PAGE 14 INSTRUCTION MANUAL TX4400
Note: You can test this by opening the squelch and
selecting various channels with the channel switch. The
radio will remain quiet on those channels that are set for
Quiet operation while normal channels will emit the usual
background noise.
DE-ACTIVATING THE QUIET MODE
1. Select any channel that has been tagged for Quiet
operation. ‘Q’ and 'QUIET' will be displayed.
2. Briefly press the QUIET key. 'QUIET' will disappear from
the top of the display and all channels tagged for Quiet
operation will now operate normally again.
RECEIVING SIGNALS IN THE QUIET
MODE
• If a normal signal is received on a QUIET channel, the
channel will appear busy (the 'BUSY' indicator will be
visible) but no sound will be heard from the speaker. This
means you will not be disturbed by the signal.
• If a normal signal is received on an Open channel (one
that is not tagged with ‘Q’) the signal will be heard in
the usual way.
• If a signal containing your Selcall Ident is received on
any channel - Open or QUIET - the QUIET mode will be
cancelled and the alarm will beep to alert you to the
call. In addition, the callers Ident or ALPHA Name will
be displayed. All channels will now be open for normal
transmission and reception.
SCANNING IN THE QUIET MODE
The TX4400 will allow you to scan while the QUIET mode is
active. Using this feature you can monitor a group of Quiet
channels or a combination of Quiet and Open channels.
To Scan in the QUIET Mode:
1. Briefly press the OS/GS key to select the required Scan
group.
2. Select the channels you wish to scan and store them in
the Scan memory.
3. From those channels, select the ones you wish to remain
Quiet and tag each one for QUIET operation.
4. Press the SCAN key. The radio will begin scanning and
'SCAN' will be displayed.
5. Now, briefly press the QUIET key to activate the QUIET
Mode. The radio will then be scanning in the
QUIET mode.
RECEIVING SIGNALS WHILE SCANNING
IN THE QUIET MODE
• If a normal signal is received on an open channel,
scanning will pause while the channel is busy and will
resume scanning 5 seconds after the channel becomes
clear. (If you were scanning in Group Scan mode, the
radio may switch between the open channel and the
Priority channel - this is normal).
• If a normal signal is received on a Quiet channel but your
Selcall Ident is not detected, the signal will be ignored
and scanning will continue.
• If a signal containing your Selcall Ident is received on
any channel - Open or Quiet - both scanning and QUIET
modes will be cancelled and the receiver will stay on
that channel. In addition, the alarm will beep to alert
you to the call and the callers Ident or ALPHA Name will
be displayed. The channel will now be open for normal
transmission and reception.
Note: To ensure reliable Selcall detection when scanning, it
is recommended that you restrict the number of channels in
the Scan group to 5 or less.
GROUP CALLING
The TX4400's Selcall system includes a Group Call function
which allows you to call up to 10 radios simultaneously.
This can be useful in an emergency situation where you
may need to transmit a message to a number of radios in
your group.
The Group Call function works by allowing you to enter a
special 'group code' into the last digit position of the Selcall
Ident you are sending. The 'group code' appears as an 'A'
when displayed in the radio. When this 'group code' is received,
it substitutes for any other number in the last digit position. As
long as the first 4 digits of the Selcall you are sending match
those of the radios you are calling, their Selcall alarms will be
activated as if their full 5 digit Selcall Idents had been received.
To achieve this, the 10 radios you are calling must be
programmed with sequentially numbered Selcall Idents.
e.g. 12030, 12031, 12032, 10233 . . --> , 12039
• Transmitting the Selcall Ident 12031 will only activate the
alarm in the radio with the Selcall Ident of 12031.
• Transmitting 1203A will activate the alarms in all radios
with Idents 12030 through 12039 (a total of 10 radios).
If the radios in your fleet do not have sequentially numbered
Selcall Idents and you want to make use of this function, you
can arrange for your dealer to re-program the Selcall Idents in
your radios.

TX4400 INSTRUCTION MANUAL PAGE 15
PROGRAMMING AND SENDING GROUP
CALLS
Entering a Group call Ident is the same as entering a
normal Selcall Ident.
1. Press the CALL button to select the ‘CALL TO’ mode.
‘CALL TO’ is displayed with a memory location number
on the left and an associated 5 digit Selcall Ident on the
right. If the radio is in the ALPHA display mode, briefly
press the F key followed by the ALPHA key to return to
the Ident display.
2. Enter the required Selcall ident as follows:
(a) Briefly press the channel knob. The right-hand digit
of the Selcall Ident will flash.
(b) Rotate the Channel knob to select 'A' in the right-
hand flashing digit position. This is the special code
that will create the Group Call.
(c) Briefly press the channel knob again to select the
next digit position.
(d) Rotate the Channel knob to select the required
number in the next flashing digit position.
3. Repeat steps (c) and (d) to enter all 5 digits as required.
When completed, the first 4 digits of the Ident you have
entered will match all the radios in the group. The last
digit will be set to 'A'.
Once the Ident has been entered you have 20 seconds to
send it otherwise the 'CALL TO' mode will be cancelled and
the Ident you entered will be lost.
SENDING THE SELCALL IDENT
With the required Selcall Ident displayed in the ‘CALL
TO’ mode, press and hold the CALL button for a few
seconds until the radio beeps. The Selcall Ident will be sent
automatically and the radio will return to normal operation.
CALL ACKNOWLEDGE IN GROUP MODE
There is no call acknowledge when sending group calls.
This is to prevent all the radios in your group from trying to
respond to your Selcall transmission at the same time.
STORING GROUP CALL IDENTS
Group Call Idents can be stored in memory in the same way
as a standard Selcall Ident.
RECEIVING GROUP CALLS
Receiving a Group call is identical to receiving a normal
Selcall except that the alarm sound is a LOW tone beep
instead of the normal High tone beep. The Callers Ident or
ALPHA Name appears on the display in the usual way.
PAGER (TRANSPOND) MODE
OVERVIEW
The PAGE or transpond feature allows you to leave your
radio unattended yet still be informed of any incoming
Selcalls. If your Selcall Ident is received while your TX4400
is in the PAGE mode it will automatically transfer the
incoming Selcall to another UHF radio. The page mode can
be used either while monitoring a single channel or while
scanning in open scan or group scan mode.
To receive the Paging call, the other UHF radio must be
fitted with a CCIR compatible Selcall.
Note: To allow your TX4400 to operate in the PAGE mode
when your vehicle is unattended, your radio must be
wired so that it has a continuous 13.8 Volt power source
even when the vehicle's ignition is switched off (see
installation instructions).
SELECTING THE PAGING CHANNEL
Your TX4400 can be set to PAGE on any of the 40 UHF CB
channels. Select the required Paging channel as follows:
1. Turn the TX4400 OFF.
2. Press and hold the F and PAGE keys simultaneously
while turning the radio ON. The radio will display PAGE
along with the currently selected paging channel.
3. Rotate the Channel switch to select the new paging
channel.
4. Turn the radio OFF to store the new channel.
You can now turn the radio back ON again for normal
operation.
SETTING THE PAGING IDENT
For the Paging feature to work, you must program your
TX4400 with the Selcall Ident of the radio you wish to
transfer the incoming calls to. This PAGE Ident is stored
in memory location 11 of the 'Call To' memory. It is
Insert ‘A’ in the last digit position
Select Pager Ident

PAGE 16 INSTRUCTION MANUAL TX4400
programmed in the same way as other Selcall Idents.
1. Press the CALL button to select the ‘CALL TO’ mode.
‘CALL TO’ will be displayed with a memory location
number on the left and an associated 5 digit Selcall
Ident or ALPHA Name on the right.
2. Rotate the Channel switch to select the memory
location 11. If your radio is in ALPHA mode, PAGER will
be displayed. This is a fixed ALPHA name for the Paging
memory and cannot be changed. If necessary, briefly
press the F key followed by the ALPHA key to select the
IDENT display mode.
3. Enter the required Selcall ident as follows:
(a) Briefly press the Channel knob. The right-hand
digit of the Selcall Ident will flash.
(b) Rotate the Channel knob to select the required
number in the flashing digit position. (c) Briefly
press the Channel knob again to select the next
digit position.
(d) Repeat steps (b) and (c) to program all 5 digits as
required.
4. Now press and hold the Channel knob. The Selcall Ident
will flash for a few seconds, then the radio will beep as
the Ident is stored in the Paging memory.
MONITORING A SINGLE CHANNEL WHILE
IN PAGE MODE
To monitor a single channel in the Page mode:
1. Select the required channel using the channel switch.
2. Briefly press the F key followed by the PAGE key. 'PAGE'
will be displayed along with the selected channel. The
page mode is now active.
Note: The display lighting will extinguish after 10 seconds
to conserve power in case the radio is to be left in Page
mode for an extended period. This also makes the radio less
visible if it is left in an unattended vehicle at night.
Once the Page mode is selected, you can transmit and receive
on the selected channel in the usual way. However, the
Channel switch and the SCAN, OS/GS, DUP and CALL
keys are disabled.
Note: If the selected channel has been tagged for Quiet
operation, the QUIET mode will be automatically selected and
QUIET will be displayed. In this case, you will not be able to
transmit.
If you Selcall Ident is received on the selected
channel:
Your TX4400 will send an acknowledge beep back to the
caller then change to the Paging channel and transmit the
Page Ident. It will finally return to the selected channel,
sound the alarm and display the Ident or Alpha Name of
the caller.
Meanwhile the other receiver will be beeping to tell you
that someone has called you. You can then return to your
TX4400, identify the caller’s Ident and return the call.
Note: Before transmitting on the Paging channel, the
TX4400 will check the channel for activity and will not
transmit if the channel is in use. Only when the channel is
clear will the paging Ident be sent.
SCANNING IN PAGE MODE
1. Select the required SCAN group, program the required
channels and then briefly press the SCAN key. The radio
will begin scanning.
2. Now briefly press the F key followed by the PAGE key.
'PAGE' will be displayed.
USING OPEN SCAN
If the radio is scanning in the Open Scan mode, you will
not be able to transmit unless the scan has stopped on a
busy channel.
USING GROUP SCAN
If the radio is scanning in the Group scan mode, you can transmit
on the Priority channel at any time.
USING THE QUIET MODE
If any channels have been tagged for Quiet operation, the
QUIET mode will be automatically selected and 'QUIET' will
be displayed. You will not be able to transmit.
If while scanning on any channel, your Selcall Ident is
received:
The TX4400 will stop scanning on that channel, send an
acknowledge beep back to the caller then change to the
Paging channel and transmit the Page Ident. It will finally
return to the channel, sound the alarm and display the
Ident or Alpha Name of the caller.
Meanwhile the other receiver will be beeping to tell you
that someone has called you. You can then return to your
Enter
Pager Ident
Call To
Mode
Select Memory Location 11
Selected
Channel Page
Mode
Selected

TX4400 INSTRUCTION MANUAL PAGE 17
TX4400, identify the Caller’s Ident and return the call.
Note: Before transmitting on the Paging channel, the
TX4400 will check the channel for activity and will not
transmit if the channel is in use. Only when the channel is
clear will the paging Ident be sent.
TO RETURN A CALL IN PAGE MODE
If you return to your radio and it is beeping, briefly press the
QUIET key. The radio will exit the PAGE mode and 'CALL
FROM' will be displayed along with the Selcall Ident or
Alpha Name of the Caller.
To return the call, briefly press the CALL button. The
Caller's Ident will be transferred to the 'CALL TO' mode
ready for sending. Now press and hold the CALL button for
a few seconds until the radio beeps. The callers Selcall Ident
will be sent. If the call is successful, you will hear two quick
acknowledge beeps in your radio's speaker as the caller's
radio responds.
DEACTIVATING THE PAGE MODE
• To de-activate the Page mode, briefly press the
QUIET key.
• To de-activate the Page mode and jump to the Priority
channel, briefly press the Channel knob.
CTCSS
CTCSS (Continuous Tone Coded Squelch System) is a
squelch quietening system that allows several groups
of users to share the same channel without disturbing
each other. It uses one of 50 preset sub-audible (very low
frequency) tones to open and close the squelch on your
radio. The system applies a continuous low-level tone to
your transmission and a matching tone decoder to your
receiver's Squelch. With CTCSS 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.
The TX4400 allows CTCSS to be enabled or disabled on
individual channels. In addition, the CTCSS tone frequency
is user programmable. Note that the CTCSS tone you select
will be used for all CTCSS enabled channels in your radio.
MONITOR FUNCTION
The monitor function temporarily opens your radio's
Squelch to allow you to listen for signals from other CTCSS
users outside your group. Because their CTCSS tone is
different to yours, your Squelch would normally remain
closed, preventing you from hearing them. By using the
Monitor switch, you can open the squelch and listen on the
channel to check that it is clear before transmitting. This
will help prevent you from accidently transmitting over the
top of someone.
To use the Monitor Function, press the Squelch knob
(MON). If no signals are present you will hear the usual
hiss of an empty channel. The squelch will remain
open as long as the Squelch knob remains pressed.
Release the Squelch knob to restore the Squelch to its
previous setting.
SELECTING THE REQUIRED CTCSS TONES
To select the required CTCSS tones on your radio, use the
following procedure:
1. Switch the TX4400 OFF at the volume control.
2. Press and hold the F and SILENT keys simultaneously
while turning the radio ON again. 'CODE' will be
displayed and the 'SILENT' icon will be flashing. In
addition the ‘BUSY’ icon will be visible indicating you are
about to select the receiver's CTCSS tone. The channel
display will now correspond to one of 50 different
CTCSS tones as shown in the table below. The factory
default is 00, which is No Tone.
3. To select the desired receiver tone, rotate the Channel
switch until the required tone number is displayed.
4. Press and hold the QUIET key for a few seconds. Both
the code number and the 'SILENT' icon will flash, then
the radio will beep as the code is stored.
5. Briefly press the QUIET key. The 'TX' icon will appear
indicating you are now selecting the transmitter's
CTCSS tone.
6. To select the desired transmit tone, rotate the Channel
switch until the required tone number is displayed.
7. Press and hold the QUIET key for a few seconds. Both
the code number and the 'SILENT' icon will flash, then
the radio will beep as the code is stored.
Selected
CTCSS
Tone
SILENT is Flashing
BUSY Icon indicates Receive
Tone is displayed
Selected
CTCSS
Tone Silent is
Flashing
TX Icon indicates Transmit Tone is displayed

PAGE 18 INSTRUCTION MANUAL TX4400
8. Now switch the radio OFF then ON again to return to
normal operation.
Note: To disable the sending or receiving of CTCSS tones,
set either tone to 00. If both transmit and receive tones are
set to 00, the CTCSS function is disabled and cannot be
selected.
ENABLING THE CTCSS FUNCTION ON A
CHANNEL
1. Select the required channel.
2. Briefly press the F key followed by the SILENT key.
A high beep will be heard and the 'SILENT' icon will
appear.
You may activate CTCSS on as many channels as you wish
except the emergency channel 5.
To de-activate CTCSS, repeat steps 1 & 2 above. A low beep
will be heard and 'SILENT' will disappear.
HOW TO DISABLE FEATURES
The TX4400 has a number of features that can be disabled
by the user to allow for much simpler operation. This is
done by disabling one or more of the keys on the front
panel. These include the Function, Scan/Dim, OS/GS/
Page, Duplex/Alpha and the Quiet/Silent keys.
To disable one of the keys:
1. Turn the radio OFF.
2. Press and hold the key you wish to disable while turning
the radio back ON.
A low beep will be heard and the selected key will no
longer function.
To re-enable the key, repeat the steps above. When the
radio is turned on again, a high beep will be heard and the
key will function normally again.
For example, to disable the SCAN function:
1. Turn the radio OFF.
2. Press and hold the SCAN key while turning the radio
back ON. A low beep will be heard and the SCAN
function will no longer be available.
Repeat the procedure to re-enable the SCAN function.
REPEATERS
A repeater system consists of a linked transmitter/receiver
combination installed in a prominent location. The repeater
is designed to receive signals on a designated channel and
re-transmit them on another channel.
Repeaters are usually located on hills, mountains or tall
buildings. The increased elevation greatly improves the
range of the repeater beyond that of a normal base or
mobile. This means that the repeaters are able to receive
and retransmit signals to radios that would otherwise be
out of range of each other.
Tone No. Frequency Hz Tone No. Frequency Hz Tone No. Frequency Hz Tone No. Frequency
Hz
00 0 13 100.0 26 156.7 39 196.6
01 67.0 14 103.5 27 159.8 40 199.5
02 69.4 15 107.2 28 162.2 41 203.5
03 71.9 16 110.9 29 165.5 42 206.5
04 74.4 17 114.8 30 167.9 43 210.7
05 77.0 18 118.8 31 171.3 44 218.1
06 79.7 19 123.0 32 173.8 45 225.7
07 82.5 20 127.3 33 177.3 46 229.1
08 85.4 21 131.8 34 179.9 47 233.6
09 88.5 22 136.5 35 183.5 48 241.8
10 91.5 23 141.3 36 186.2 49 250.3
11 94.8 24 146.2 37 189.9 50 254.1
12 97.4 25 151.4 38 192.8
CTCSS TONE FREQUENCY CHART

TX4400 INSTRUCTION MANUAL PAGE 19
Rear MountCentre Mount
LOW PROFILE MOUNTING RAISED TILT MOUNTING
Normally, UHF radios transmit and receive on the same
channel. This is known as SIMPLEX operation. However, to
communicate through repeaters, your radio must be able
to transmit and receive on different channels (known as
DUPLEX). Your TX4400 has a Duplex key to allow you to
operate through repeaters.-
The Duplex function only operates on channels 1 - 8, as
these are the channels that have been designated for
repeater use. When Duplex mode is selected, your TX4400
receives on the selected channel (e.g. channel 1) but
automatically transmits 30 channels higher (i.e. channel
31). The UHF repeater receives your signal on Channel 31
and retransmits it on channel 1 for others to hear.
SIMPLEX/DUPLEX RANGE COMPARISON
INSTALLATION
The TX4400 is supplied with a double action mounting
bracket and vibration proof washers. The mounting bracket
can be secured in any convenient location (i.e. under the
dash, above the dash, on the centre console etc).
The TX4400 mounting bracket is designed with a unique
dual position gimbal mounting slot. This design not only
allows the TX4400 to be tilted over a much greater range,
but also provides a slim, low profile mounting position for
installations where space is very limited.
When installing the radio, avoid mounting it close to
heaters or air conditioners. Screw the mounting cradle to a
firm surface. The vibration proof washers have an adhesive
backing on one side. The vibration proof washers have an
adhesive backing on one side.
This allows them to remain in the correct position when
removing or refitting the radio. Slide the TX4400 into the
bracket, adjust it for the correct viewing angle and tighten
the gimbal knobs securely. Finally, connect the power and
antenna leads to the sockets provided on the rear of the
radio.
Note: The sides of your TX4400 have two pairs of gimbal
mounting holes - one pair in the centre of the case and
the other pair towards the rear. A black label covers the
rearward gimbal holes. For most installations, the mounting
bracket should be installed using the central gimbal holes.
If your TX4400 is replacing an existing TX4200 or TX4000
installation, you can fit your TX4400 to the existing bracket
by utilising the gimbal mounting holes near the rear of the
case. Simply screw the gimbal knobs through the label
to access the threads in the chassis. This will
bring your TX4400's front panel in line with that
of your previous radio and eliminate the need to
reinstall the mounting bracket. Be sure to tighten
the gimbal knobs securely as there will be a little
more weight forward of the mounting bracket
with this installation.
Centre Mounting Position
Rear Mounting Position

PAGE 20 INSTRUCTION MANUAL TX4400
FITTING THE MICROPHONE
The microphone uses a miniature 6 pin telephone style plug
and socket.
To fit the microphone:
1. Position the microphone plug so the plastic tab faces
downwards. Press the plug into the socket until
it ‘clicks’.
2. Gently press the rubber strain relief into the hole
surrounding the socket so that the slot around the strain
relief fits neatly inside the lip of the hole.
Removing the microphone.
1. Squeeze the rubber strain relief near the front panel to
disengage the slot, and slide the strain relief back along
the microphone cord.
2. Press the small 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 pressed
again. You may need a small bladed screwdriver for this
task, as the tab can be difficult to reach with
your fingers.
REAR MICROPHONE CONNECTION
TX4400M
The TX4400M comes with the LEM6M rear accessory pack
factory fitted.
To fit the rear mounting microphone optional
accessory kit (LEM6M):
1. Remove the 4 screws from the rear panel securing the
cover and slide the cover from the radio (figure 1).
2. Turn the TX4400 upside down, remove the black
grommet from the back of the radio and insert into the
front panel microphone socket aperture of the TX4400
(figure 2).
3. Secure the rear microphone printed circuit board
(PCB) supplied with the LEM6M accessory kit with
the screws provided (Figure 3).
4. Connect the 6 pin lead attached to the rear microphone
PCB and the 6 pin socket on the front PCB.
5. Refit the cover and fasten with the 4 screws
Microphone Extension Lead
The LEM6P is a 4 metre microphone extension lead that can
be fitted to the microphone socket.
Cable
Microphone plug
Lift locking tab
to release plug
Connection
to front
PCB
Rear
microphone
socket
Rear microphone PCB
Figure 1
Figure 2
Figure 3