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10.5. ADVANCED SQUELCH TYPES
10.5.1.
CTCSS & REVERSE TONE
Continuous tone-coded squelch system (CTCSS) is a function which opens squelch
only when a preset tone frequency is detected in the signal. Otherwise the audio will
be muted. The tone code squelch only functions in FM mode, with IF bandwidth set
to 6kHz or 15kHz.
To enable CTCSS:
1.
Press [MENU], then [ENT].
2.
Use [▶] to select [VFO EDIT], then press [ENT].
3.
Use [▶] to select [SQL TYPE], then press [ENT].
4.
Rotate the dial selector until CTCSS is displayed and
then press [ENT].
5.
Press [ENT] again and then rotate the dial knob to
designate one of the following tone frequencies to open
the squelch.
OFF
71.9
85.4
100.0
118.8
136.5
159.8
173.8
189.9
206.5
233.6
* SRCH performs auto-detect of the tone frequency.
6.
Press [ENT] and then press [▶] to select line 9, [VFO PARAMETER SET] and then press
[ENT] to save the selections.
◯「CTC」will be displayed on the left side of the LCD while that function is active.
For REVERSE TONE operation, the tone frequency table is the same, however the squelch
reacts in the opposite way compared to CTCSS, that is the squelch "closes" when the
designated tone is detected, and it remains open for all other tone frequencies. This system
is used mainly in Japan.
◯ 「RTN」will be displayed on the left side of the LCD when that function is active.
SRCH*
74.4
88.5
103.5
120.0
141.3
162.2
177.3
192.8
210.7
241.8
60.0
77.0
91.5
107.2
110.9
123.0
127.3
146.2
151.4
165.5
167.9
179.9
183.5
196.6
199.5
218.1
225.7
250.3
254.1
45
67.0
69.3
79.7
82.5
94.8
97.4
114.8
131.8
156.7
171.3
186.2
203.5
229.1
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