Subaudible Tones; Tone Squelch - Icom IC-V8 Instruction Manual

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 [1•
] after [A•
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 " " disappear.
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, use the
frequencies as following table is recommended.
• Recommended tone frequencies
67.0 77.0 88.5 100.0
69.3 79.7 91.5 103.5
71.9 82.5 94.8 107.2
74.4 85.4 97.4 110.9
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] is pushed.
FUNC
] after [A•
TONE
D
114.8 131.8 151.4 173.8 203.5
118.8 136.5 156.7 179.9 210.7
123.0 141.3 162.2 186.2 218.1
127.3 146.2 167.9 192.8 225.7
D Setting subaudible tones for tone squelch
operation
Separate tone frequencies can be set for tone squelch operation
than repeater operation (the same range of tones is available— see
below). As the repeater tones, these are set in set mode.
q Select VFO or memory channel.
w Push [A•
FUNC
e Push [∫] or [√] several times until "Ct" ap-
pears when selecting CTCSS, or "dt" ap-
pears when selecting DTCS.
• " " flashes when selecting CTCSS, or " "
flashes when selecting DTCS.
r Rotate [VOL] to select the desired subaudible tone.
t Push [#•
ENT
mode.
When set mode is selected from memory mode.
y Push [C•
] is MR
FUNC
• Emits 3 beeps.
• VFO mode is selected automatically.
u Push [C•
MR
• Emits 3 beeps.
The step y and u are necessary when overwriting the memory
contents for permanently. Therefore, the set tone frequency is used
for temporarily operation only, these steps are not necessary.
• Subaudible CTCSS tone frequency list
67.0 79.7
69.3 82.5
233.6
71.9 85.4
241.8
74.4 88.5
250.3
77.0 91.5
SUBAUDIBLE TONES
] + [8• ] to enter set mode.
SET
D
] to program the selected tone and exit set
] for 1 sec. after [A• ] is pushed.
FUNC
] for 1 sec. after [A• ] is pushed.
FUNC
94.8 110.9 131.8 156.7 171.3
97.4 114.8 136.5 159.8 173.8
100.0 118.8 141.3 162.2 177.3
103.5 123.0 146.2 165.5 179.9
107.2 127.3 151.4 167.9 183.5
9
F
TX
MR
F
D TX
MR
186.2 203.5 229.1
189.9 206.5 233.6
192.8 210.7 241.8
196.6 218.1 250.3
199.5 225.7 254.1
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