Manual

T X 3 42 0 I N S TR U C T I ON M AN UAL PA GE 1 5
USING SEEK MODE
Before using Seek mode you should
1. Select your preferred frequency step (12.5 kHz or
25 kHz).
2. Enable the listening channel numbers in which you wish
to store active frequencies. You cannot use Seek mode
unless at least one channel is enabled.
3. Select NUMERIC mode so that the frequency can be
displayed (rather than the alpha label).
To scan for active frequencies
and store them into a listening channel
1. Select the required listening channel (41-99).
The frequency currently stored in that channel will
be displayed.
2. Enter the Frequency edit mode by pressing and holding
MENU key until a beep is heard.
3. Briefly press the SCAN key. The radio will begin
scanning, using the selected channel step, starting from
the current frequency. The channel number will remain
constant (because the radio is scanning frequencies not
channels) but the frequency will change as the scan
advances through the band.
4. When a signal is found, scanning will pause on that
frequency. Once the signal has disappeared and the
frequency remains clear for 5 seconds, scanning
will resume.
5. To manually skip over an active frequency and continue
scanning press the CALL/SKIP button.
6. When you find a frequency you wish to store, press
and hold the Channel knob until a beep is heard.
The frequency will be stored under the selected listening
channel number, but the Frequency Edit Menu will
still be active, ready for further Seeking. To store the
frequency and exit the menu, press and hold the
MENU button.
7. To exit the Frequency Edit menu without saving the
current displayed frequency, briefly press the MENU key.
The next menu item will be shown (typically the Squelch
Set menu). At this stage, press and hold the MENU
button until a beep is heard to exit.
SETTING SEEK MODE FREQUENCY LIMITS
When in Seek mode, the default frequency band to scan is
the entire receiver tuning bandwidth of 403 MHz-520 MHz.
However, in many cases you may only be interested
in searching for signals within a small section of the
available frequency band. To make searching easier the
TX3420 allows you to set upper and lower frequency limits.
The Seek function will then only search within the specified
range, thereby increasing the chance of finding an active
frequency of interest.
There are two seek limit points available, LIM-1 and
LIM-2. While in the frequency edit mode, press and hold
the SCAN key until a beep is heard to store the current
frequency as a limit. To select and jump to the next limit,
press the VOL knob.
To select and display a limit point
While in frequency edit mode, briefly press the VOL knob.
The next frequency limit point will be selected, the display
will briefly show ‘LIM-1’ or ‘LIM2’ and then the frequency
of the limit point will be shown. At this stage the radio is
also tuned to this frequency, and if there is activity on this
frequency, it can be heard in the speaker.
To set or edit a limit point
1. Select the desired limit point to edit as described in the
previous paragraph.
2. Rotate the Channel knob until the display shows the
frequency of the desired limit point.
3. Press and hold the SCAN key until a beep is heard.
The current frequency is now stored to the current limit
point. The display will briefly show ‘LIM-1’ or ‘LIM-2’,
and then revert to showing the frequency again.
4. Repeat steps 2-3 to update the current limit point with
a new frequency if desired.
To erase a limit point
1. Select the desired limit point to erase as described above.
2. Rotate the Channel knob counter clockwise until the
frequency display reads ‘OFF’.
3. Press and hold the SCAN key until a low beep is heard.
The selected seek limit point is now erased.
USING THE FREQUENCY LIMITS TO SCAN
Once the Seek mode frequency limits are set, the frequency
band is effectively split into three segments.
TIP: It is easiest to picture the limit points as the first limit
being lower in frequency than the second, but this is not
really necessary. Even if the frequencies are programmed so
that the limit points are reversed, the TX3420 will always
scan inside a selected frequency range, in the upwards
direction. The initial frequency where the seek was started
determines which frequency band will be scanned.
520
MHz
Limit 1 Limit 2403