Manual

PAG E 4 I N S TR U C T I ON M AN UAL T X 3 42 0
Channel Selector/PRI Key
L
iquid Crystal Display Volume Control
M
icrophone Port
M
enu Key/F Key
S
can Key/OS/GS Quiet Key/Duplex Key
S
quelch KeyAlpha Key
MENU
F
PUSH
SCAN
OS/GS
QUIET
DUP
SQL
ALPHA
T X 3 4 2 0
PRI
GENER Al OPERATION
FUNCTION KEY
The four keys beneath the TX3420’s display have both
primary and secondary functions. Their primary functions
are printed in Black while their secondary functions are
printed in Red.
To access the primary functions
Simply press the required key. e.g. To control the Squelch,
briefly press the SQL key.
To access the secondary functions
Press the F key followed immediately by the required key.
e.g. To lock the radio, briefly press the F key (‘F’ is displayed),
then press the Channel knob. The radio will lock.
Note: If the secondary key is not pressed within 10 seconds
the F key selection will be cancelled.
VOLUME KEY
Rotate the Volume control clockwise past the ‘click’ to turn
the TX3420 ON. Continue to advance the control clockwise
to increase the volume. Rotate the control counter clockwise
to turn the radio OFF.
Note: At minimum volume setting there is still sufficient
volume to be heard in a quiet cabin environment.
KEYLOCK FEATURE
The key locks the keys on the unit to prevent
unintentional key presses from altering your TX3420
settings. While the keys are locked, only the Push-To-Talk
(PTT), on/off Volume control and the Keylock key will
continue to function.
To lock the keys
Briefly press the F key, then press and hold the key
until a high beep is heard. The ‘ ’ symbol will appear
on the display.
To unlock the keys
Briefly press the F key, then press and hold the key
until a low beep is heard. The ‘ ’ symbol will disappear
from the display.
SELECTING CHANNELS
Rotate the Channel knob to step upwards or step
downwards one or more channels.
TRANSMITTING
Prior to transmitting, always check the channel is not being
used. This can be done by either listening or by checking the
‘Busy’ indicator is not lit.
To transmit, press the PTT (Push-to-Talk) button on the
microphone. Hold the microphone about 5-8 cm from your
face and speak at a normal voice level. The microphone is
quite sensitive so it is not necessary to raise your voice or
shout. Release the PTT when you have finished talking.
SQUELCH CONTROL
Squelch control is used to eliminate the background noise
when there are no signals present. The TX3420 features
a preset Squelch system. The Squelch sensitivity has been
factory set to provide optimum performance in most
environments, however the sensitivity can be altered by the
user if required, to suit varying environmental situations.
The Squelch can be opened or closed with the SQL key.
When the Squelch is open, the receiver’s background noise
can be heard and ‘BUSY’ is displayed. When the Squelch is
closed, the receiver remains quiet when there are no signals
present but an incoming signal will override the squelch and
be heard in the speaker.
To open the Squelch
Briefly press the SQL key. A low beep will be heard. If
there are no signals present you will hear the receiver’s
background noise.
To close the Squelch
Briefly press the SQL key again. A high beep will be heard
and the receiver will become quiet.
Note: If an incoming signal is very weak and is close to the
minimum squelch level, it may become broken or ‘chopped’
by the squelch action. To prevent this, simply open the Squelch