6
Flashlight
With GT-18 turned on, shortly press the
LAMP
to turn on/off the flashlight at the top side of the radio.
VOX
The VOX feature enables hands free conversations without using PTT: just speak in the direction of the microphone and the communication will
be automatically activated. The VOX sensitivity can be adjusted in 5 different levels (1…5) through the programming software:
Level 2 is set by default and has the lowest VOX sensitivity, 5 is the lowest one.
With the programming software you can enable/disable the VOX feature and select the sensitivity levels.
CPS programming path: Edit > VOX > VOX Level
Squelch
The Squelch function suppresses noises on free channels and allows receiving even weak signals. GT-18 has 10 different Squelch levels that can
be set by programming software: 0 means that the Squelch is turned off; from level 1 to level 9 you will have different levels of noise reduction.
The higher is the level, the louder will be the Squelch. By default, the Squelch level of GT-18 is set on level 4. Make sure you do not set an
excessively high squelch level because in this case you may not be able to receive weaker signals. On the other hand an excessively low Squelch
value could enable the Squelch even when no signals are present. Squelch must always be adjusted when no signals are present. The Time Out
timer is settable from 30 sec to 270 sec. only through the programming software. This feature is disabled by default.
CTCSS/DCS tones
CTCSS and DCS tones are similar to access codes and enable the radio to communicate only with the users that are tuned on the same channel
and have set the same code. For each channel, you can set up to 50 CTCSS tones and 210 DCS codes. The CTCSS/DCS tones are a sort of
“access codes” and enable the radio to communicate only with the other users set on the same frequency and on the same CTCSS/DCS tone.
Undesired signals coming from other stations set on the same frequency but with different CTCSS/DCS tones won’t be received.
Appendix A. – Frequency Chart
Ch.
Freq. (MHz)
Ch.
Freq. (MHz)
Ch.
Freq. (MHz)
Ch.
Freq. (MHz)
1
446.00625
5
446.05625
9
446.10625
13
446.15625
2
446.01875
6
446.06875
10
446.11875
14
446.16875
3
446.03125
7
446.08125
11
446.13125
15
446.18125
4
446.04375
8
446.09375
12
446.14375
16
446.19375
