1. Rotate the Channel knob to select the required channel.
2. Press and hold the SQL key. A high beep will be heard
and ‘SILENT’ will appear on the display.
You may activate CTCSS on as many channels as you wish
except channel 5 which is designated for emergency use.
DISABLING CTCSS ON A CHANNEL
Repeat steps 1 and 2 above. A low beep will be heard and
‘SILENT’ will disappear from the display.
Note: You will not be able to activate CTCSS if the CTCSS
tone is set to ‘oF’.
Please see the CTCSS Tone Frequency Chart on page 21
SCaNNINg
The TX3420 has a SCAN function that allows groups of user
programmable channels to be scanned for signals. Channels
can be scanned at 20 channels per second. When a signal
is found, scanning will pause on that channel to allow the
signal to be heard, then resume scanning when the channel
is clear again.
SCAN GROUPS
The TX3420 features two scan groups - Open Scan and
Group Scan.
Open Scan
Allows any of the installed channels to be scanned for
activity. 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.
e.g. Scanning channels 1-8 in Open Scan
Group Scan
Also allows any of the installed channels to be scanned
for activity, 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 take precedence over any signals
received on the other channels.
e.g. Scanning channels 1-8 with Priority Channel 20
in Group Scan
SELECTING A SCAN GROUP
To pre-select a scan group
The radio is initially set to Open Scan mode. To change to
Group Scan mode, press the F key then the OS/GS key to
select Group Scan.
PROGRAMMING SCAN CHANNELS
Your TX3420 is supplied with all 40 UHF CB channels
programmed into the Open Scan memory. Any channels
not needed, can be removed if required. 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. Ensure that the radio is not already scanning. If it is,
briefly press the SCAN key to cancel the scan function.
2. Ensure you have the required scan group pre-selected.
3. Select the required channel by rotating the
channel knob.
• If ‘M’ is visible to the right of the channel number,
the selected channel is already in the scan memory.
To remove the selected channel, press and hold the
SCAN key for a few seconds until a beep is heard.
‘M’ will then disappear indicating the channel is no
longer in memory.
• If ‘M’ is not visible, then the selected channel is not
in the memory. To add the selected channel, press
and hold the SCAN key for a few seconds until
a high beep is heard. ‘M’ will now appear.
4. Repeat step 3 to add or remove other channels in the
scan memory.
To start scanning
To begin scanning, briefly press the SCAN key. A high
beep will be heard, ‘SCAN’ will appear in the display and
the radio will begin scanning. In addition the selected scan
group will be displayed below the channel number.
Note: If there is only one channel programmed into the
Open Scan memory or none in the Group Scan memory,
a long low beep will be heard when you press the SCAN
key and the command will be ignored.
To stop scanning
To cancel the scan, briefly press the SCAN key. A low beep
will be heard and ‘SCAN’ will disappear from the display.
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