Icom IC-4088A Instruction Manual page 19

D D CTCSS code table
CH Freq.
01 67.0
02 71.9
03 74.4
04 77.0
05 79.7
06 82.5
07 85.4
08 88.5
09 91.5
10 94.8
✔ 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 out-
put can be a problem. Note that CTCSS group mode is not pri-
vate—anyone can receive your calls.
The IC-4088A is equipped with 38 tone codes for CTCSS GROUP
MODE use. Selecting a code applies it to all 14 operating chan-
nels. Each push of [PTT] superimposes your group code over your
transmit 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.
CH Freq.
11 97.4
12 100.0
13 103.5
14 107.2
15 110.9
16 114.8
17 118.8
18 123.0
19 127.3
20 131.8
GROUP MODE (CTCSS)
CH Freq.
21 136.5
22 141.3
23 146.2
24 151.4
25 156.7
26 162.2
27 167.9
28 173.8
29 179.9
30 186.2
6
CH Freq.
31 192.8
32 203.5
33 210.7
34 218.1
35 225.7
36 233.6
37 241.8
38 250.3
- - - OFF
(unit: Hz)
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