Tone Squelch Operation; I Tone Squelch Operation - Icom IC-41S Instruction Manual

6

TONE SQUELCH OPERATION

I Tone squelch operation

The transceiver is equipped with 51 CTCSS tone frequencies,
104 DTCS codes. CTCSS/DTCS operation provides commu-
nication with silent standby since you will only receive calls
from group members using the same CTCSS tone frequen-
cy/DTCS code.
NOTE: Channels 5 and 35 are used for the emergency
channels, and CTCSS/DTCS operation is not available on
these channels.
DSetting CTCSS tone frequency/
DTCS code
q Select the desired channel except for channels 5 and 35.
(p. 11)
w Push and hold [Top]
mode.
e Push [Top] several times until "C" appears.
r Push
to toggle the CTCSS tone frequency/DTCS
code setting mode.
t Push [CH Up] or [CH Down] to set the desired CTCSS
tone frequency/DTCS code.
22
[
for 2 sec. to enter set
(Set Mode)
CTCSS tone setting mode
CTCSS tone freqnency
List number
(grey line)
y Rotate [VOL] to turn the power OFF, or push and hold
[Top] for 2 sec. to exit set mode.
(Set Mode)
• Available CTCSS tone frequency list
No. Freq. No. Freq. No.
01 67.0 12 94.8 23
02 69.3 13 97.4 24
03 71.0 14 100.0 25
04 71.9 15 103.5 26
05 74.4 16 107.2 27
06 77.0 17 110.9 28
07 79.7 18 114.8
29
08 82.5 19 118.8 30
09 85.4 20 123.0 31
10 88.5 21 127.3 32
11 91.5 22 131.8 33
NOTE: The transceiver has 51 tone frequencies and con-
sequently their spacing is narrow compared with units hav-
ing 38 tones. Therefore, some tone frequencies may
receive interference from adjacent tone frequencies.
DTCS code setting mode
DTCS code
List number
(grey line)
(Hz)
Freq. No. Freq. No. Freq.
136.5 34 177.3 45 218.1
141.3 35 179.9 46 225.7
146.2 36 183.5 47 229.1
151.4 37 186.2 48 233.6
156.7 38 189.9 49 241.8
159.8 39 192.8 50 250.3
162.2 40 196.6 51 254.1
165.5 41 199.5
167.9 42 203.5
171.3 43 206.5
173.8 44 210.7