GME TX3420 - Manual (Page 17)

t X 3 4 2 0 i n s t r u c t i o n m A n uA l PA G E 1 7
2 . Press and hold the meNu key until the radio beeps .
sql-x will be displayed where x is a number from 1 to 9 .
3 . rotate the channel knob increase or decrease the
preset squelch to the desired setting .
4 . Press and hold the meNu key to store the new setting .
selectiNg DuPlex
duplex operation allows the radio to transmit on a different
frequency to that which is receives . this allows operation
through repeater stations . repeaters automatically
re-transmit your signal over a wider area, providing
greatly increased range .
duplex operation operates only on channels 1-8 and
41-48 . When duplex is selected on these channels, the
radio receives on that channel but actually transmits 30
channels higher . e .g .
* Emergency channel only
the use of locally used repeater input channels, (31-38 and
71-78) for simplex operation should be avoided . locally
used repeater receiving channels, (1-8, 41-48) should also
be avoided unless long distance communication via the
repeater facility is specifically required .
the tX3420 allows you to select duplex operation
individually on each channel .
to enable or disable Duplex on a channel
1 . select the required channel 1-8 or 41-48 (the duplex
setting feature is only available on these channels) .
ctcss toNes
ctcss (continuous tone coded squelch system) is a
squelch quieting system that allows several groups of users
to share the same channel without disturbing each other . it
uses one of a set of sub-audible (very low frequency) tones
to open and close the squelch on your radio .
there are two standard tones sets, one comprising 50 tones
and the other comprising 38 tones . both tone sets are
included in the tX3420 to provide compatibility with other
radio systems .
to toggle the required tone set
1 . switch the radio oFF .
2 . Press and hold the sQl key while switching the radio
oN again .
3 . ‘ctc50’ or ‘ctc38’ will be displayed indicating which
tone set is selected .
Note: When switching up from ctc38 to ctc50, the
radio will retain the selected ctcss tone frequency and
automatically update the tone set number to reflect its new
position in the ctc50 tone set table . e .g . if ctcss tone
frequency 233 .6 hz (ctc38 tone set #36) was selected,
the radio will then display equivalent ctc50 tone set #47 .
When switching down from ctc50 to ctc38, if there is no
equivalent ctc38 frequency, the ctcss tone will be set to
‘of’ (0 hz) . you will need to re-select a new tone .
to pre-select a ctcss tone
1 . Press and hold the meNu key until the radio beeps .
2 . briefly press the meNu key repeatedly until ‘ctcXX’ is
displayed, where XX is a number between 1-50 or ‘of’ .
3 . rotate the channel knob to select the required ctcss
tone number (see ctcss tone Frequency chart on
page 21) . if the ctc38 tone set is enabled there will be
38 tones available otherwise there will be 50 tones .
Note: to display the ctcss frequency instead of the
tone number, briefly press the channel knob . the ctcss
frequency (in hz) will be displayed . briefly press the sQl
key again to return to the tone number .
4 . to turn ctcss tones OFF select ctcoF.
5 . Press and hold the meNu key until the radio beeps,
to store the setting .
bacKlightiNg
backlighting can be set to on or off to satisfy
personal preference .
1 . Press and hold the meNu key until the radio beeps .
2 . briefly press the meNu key repeatedly until ‘liGht’
is displayed .
3 . rotate keys to cycle through the channel knob to either
on or off .
4 . Press and hold the meNu key until the radio beeps,
to store the setting .
Vechicle
Simplex/Duplex Range Comparison
simplex
repeater
operation
channel 31
channel 1
repeater
station
channel 1
channel 31
Vechicle
Channel Selected 1 2 3 4 5* 6 7 8 41 42 43 44 45 46 47 48
Receive Channel 1 2 3 4 5* 6 7 8 41 42 43 44 45 46 47 48
Transmit Channel 31 32 33 34 35* 36 37 38 71 72 73 74 75 76 77 78