User Guide

37
9
SUBAUDIBLE TONES
8
9
■ 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 page 38 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
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