Icom IC-U82 - Manual (Page 46)

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Tone squelch
D Operation
The tone squelch opens only when receiving a signal con-
taining a matching subaudible tone. You can wait for calls
from group members using the same tone and not hear other
signals.
q Set the operating frequency.
• Set the volume and squelch to the desired level as the normal op-
eration.
w Set the desired subaudible tone in
SET MODE
.
• See page 35 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 [MONI] .
t Transmit in the normal way.
y To cancel the tone squelch, push
[A• FUNC ] and [1• TONE ] .
• Repeat several times until “ ” or “ ” disappears.
NOTE: The transceiver has 50 tone frequencies and con-
sequently their spacing is narrow compared to units having
38 tones. Therefore, some tone frequencies may receive
interference from adjacent tone frequencies.
To prevent interference from adjacent tone frequencies,
using the frequencies as in the following table, is recom-
mended.
• Recommended CTCSS frequencies (Unit: Hz)
• Recommended DTCS codes
023
025
026
031
032
043
047 051
054
065
071
072
073
074 114
115
116
125
131
132
134 143
152
155
156
162
165
172 174
205
223
226
243
244
245 251
261
263
265
271
306
311 315
331
343
346
351
364
365 371
411
412
413
423
431
432 445
464
465
466
503
506
516 532
546
565
606
612
624
627 631
632
654
662
664
703
712 723
731
732
734
743
754
67.0
69.3
71.9
74.4
77.0 79.7
82.5
85.4
88.5
91.5 94.8
97.4
100.0
103.5
107.2
110.9
114.8
118.8
123.0
127.3
131.8
136.5
141.3
146.2
151.4 156.7
162.2
167.9
173.8
179.9 186.2
192.8
203.5
210.7
218.1 225.7
233.6
241.8
250.3
D
Push
FUNC
A
TONE
1
CTCSS DTCS
D
34
SUBAUDIBLE TONES
9