Subaudible Tones; Tone Squelch - Icom IC-T3H Instruction Manuals

SUBAUDIBLE TONES

Tone squelch

D Operation
The tone squelch opens only when receiving a signal containing a
matching subaudible tone. You can silently wait for calls from group
members using the same tone.
q Set the operating frequency.
• Set the AF and squelch to the desired level as the normal operation.
w Set the desired subaudible tone in the set mode.
• See right for programming.
e Push [1•
TONE
• Repeat several times until " " appears when selecting CTCSS, or
" " appears when selecting DTCS.
D
r When the received signal includes a matching tone, squelch
opens and the signal can be heard.
• When the received signal's tone does not match, tone squelch
does not open, however, the S-indicator shows signal strength.
• To open the squelch manually, push and hold [SQL].
t Operate the transceiver in the normal way.
y To cancel the tone squelch, push [1•
pushed.
• Repeat several times until " " or " " disappears.
NOTE: The transceiver has 50 tone frequencies and conse-
quently their spacing is narrow compared to units having 38
tones. Therefore, some tone frequencies may receive interfer-
ence from adjacent tone frequencies.
To prevent interference from adjacent tone frequencies, using
the frequencies as in the following table, is recommended.
• Recommended tone frequencies
67.0 77.0
69.3 79.7
71.9 82.5
74.4 85.4
] after [A• ] is pushed.
FUNC
88.5 100.0 114.8
91.5 103.5 118.8
94.8 107.2 123.0
97.4 110.9 127.3
] after [A•
TONE
D
131.8 151.4 173.8
136.5 156.7 179.9
141.3 162.2 186.2
146.2 167.9 192.8
9
] is
FUNC
203.5 233.6
210.7 241.8
218.1 250.3
225.7
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