Icom IC-T3H, Instruction Manual

Page: 41 / 68

34
9
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 [A•
FUNC
], then push [1•
TONE
].
• Repeat several times until “ ” appears when selecting CTCSS, or
“ ” appears when selecting DTCS.
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 [A•
FUNC
], then push [1•
TONE
].
• 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.
D
D
67.0
69.3
71.9
74.4 88.5
91.5
94.8
97.4 114.8
118.8
123.0
127.3
151.4
156.7
162.2
167.9 203.5
210.7
218.1
225.7 77.0
79.7
82.5
85.4 100.0
103.5
107.2
110.9
131.8
136.5
141.3
146.2 173.8
179.9
186.2
192.8 233.6
241.8
250.3
• Recommended tone frequencies
IC-T3H.qxd 03.2.6 10:18 Page 34 (1,1)