GME GA9800 Instruction Manual page 163

MENU SETTINgS
the mEnu feature provides a convenient method of customizing or
storing some of the radio's functions. the following menu options
are available.
Menu Settings
squelch
ctcss / dcs
Backlight
display colour
s-meter / Battery
Beep
To access the Menu functions
1. Press and hold the MENU key. the first menu function
is displayed.
2. Briefly press the MENU key again to cycle through each
available function in the order listed above. After the last
function has been selected, the cycle returns to the beginning.
3. Press the or keys to alter the parameters of the
selected function.
4. Press and hold the MENU key to exit and store any changes.
Setting the Squelch SenSitiVity
the sensitivity of the squelch to incoming signals can be set to suit
your operating environment. in quiet rural locations a low setting
will allow the weakest signals to be received while still keeping
the radio quiet between transmissions. in city locations, a higher
setting might be needed to ensure the squelch remains closed
when subjected to the higher interference levels often encountered
in high density areas.
the tX3340 has nine (9) preset squelch sensitivity settings
(labelled sQl-1 to sQl-9) that can be selected using the menu
function. the minimum squelch setting (sQl-1) is the most
sensitive and will allow the squelch to open on weak signals.
sQl-9 is the maximum setting, requiring very strong signals to
open the squelch. the factory default is sQl-3 which generally
provides reliable squelch operation for most applications.
To pre-select the Squelch sensitivity
1. select a channel between 1 and 40.
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.
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3. Press the or
to the desired setting.
4. Press and hold the MENU key to store the new setting.
ctcSS & DcS
CTCSS (CONTINUOUS TONE CODED SQUELCH SYSTEM)
ctcss 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 ctcss tone sets, one comprising 50 tones and the
other comprising 38 tones. Both tone sets are installed in the
tX3340 to ensure compatibility with other radio systems.
For more details, see CTCSS Tone Frequency Chart on page 19.
to toggle between the ctcss 50 tone set and the ctcss 38
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 has
been selected.
Note:
When switching from ctc38 to ctc50 the radio will retain
the currently selected ctcss tone but will update the associated
tone set number to reflect its new location in the ctc50 tone
set table.
e.g. ctcss tone frequency of 233.6 hz is tone #36 in the ctc38
tone set table but changes to tone #47 when ctc50
is selected.
When switching down from ctc50 to ctc38, if there is no
equivalent ctc38 tone frequency the ctcss tone will be set to
oF and you will need to reselect a new tone.
DCS (DIGITALLY CODED SQUELCH)
dcs is a squelch quieting system similar to ctcss, that uses low
frequency digital signals instead of one continuous low frequency
tone. As with ctcss, it also allows several user groups to share the
same channels without disturbing each other. there are 104 dcs
codes available.
see DCS Tone Chart on page 20.
Selecting a CTCSS or DCS tone
choosing which tone to use will probably be dependent on the
other radios you talk to. if you talk to others outside your group
who already use ctcss or dcs tones, you will need to select the
i n s t r u c t i o n m A n u A l
keys increase or decrease the preset squelch
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