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15
8
GROUP MODE (CTCSS)
8
D
D
CTCSS code table
(unit: Hz)
CH
Freq.
CH
Freq.
CH
Freq.
CH
Freq.
01
67.0
11
97.4
21
136.5
31
192.8
02
71.9
12
100.0
22
141.3
32
203.5
03
74.4
13
103.5
23
146.2
33
210.7
04
77.0
14
107.2
24
151.4
34
218.1
05
79.7
15
110.9
25
156.7
35
225.7
06
82.5
16
114.8
26
162.2
36
233.6
07
85.4
17
118.8
27
167.9
37
241.8
08
88.5
18
123.0
28
173.8
38
250.3
09
91.5
19
127.3
29
179.9
- - -
OFF
10
94.8
20
131.8
30
186.2
✔
What is CTCSS (Continuous Tone Coded Squelch System)
GROUP MODE
?
CTCSS (Continuous Tone Coded Squelch System) GROUP
MODE allows communication with silent stand by. Only signals
containing a specific group code can open the squelch.
This conveniently eliminates unwanted audio and is useful in group
activities or security related activities where unwanted output can
be a problem. Note that CTCSS group mode is not private—any-
one can receive your calls.
The IC-4088S is equipped with 38 tone codes for CTCSS GROUP
MODE use. Selecting a code applies it to all 40 operating channels.
Each push of [PTT] superimposes your group code over your trans-
mit signal; and, only signals containing the same code can open
your squelch. To temporarily hear all signals (including noise) push
and hold [MODE]. Do not use CTCSS GROUP MODE if you want
to be able to hear signals on all channels.
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