Icom IC-4088S 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 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.
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
8
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)
8
15