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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 if a preset tone frequency is detected in the signal. At other times,
sound will be muted. 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] and press [ENT]
3. Use [▶] to select [SQL TYPE] and press [ENT]
4. Rotate the dial selector until CTCSS is displayed and
validate with [ENT].
5. Press [ENT] again and rotate the dial selector knob to
chose any of the following tone frequencies at which the
squelch should open.
OFF SRCH* 60.0 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
118.8 120.0 123.0 127.3 131.8
136.5 141.3 146.2 151.4 156.7
159.8 162.2 165.5 167.9 171.3
173.8 177.3 179.9 183.5 186.2
189.9 192.8 196.6 199.5 203.5
206.5 210.7 218.1 225.7 229.1
233.6 241.8 250.3 254.1
* SRCH does auto-detect the tone frequency.
6. Press [ENT] then [▶] until you reach the line [VFO PARAMETER SET] and save your
selections with [ENT].
◯ 「CTC」will be displayed on the left side of the LCD when that function is active.
For REVERSE TONE, the tone frequency table is the same, except that squelch reacts the
opposite way compared to CTCSS, as it “closes” when the set tone is detected, and remains
open for all other tone frequencies. This system is mostly used in Japan.
◯ 「RTN」will be displayed on the left side of the LCD when that function is active.
10.5.2. DCS
Digital-codes squelch (DCS) is a function which opens squelch only if a preset tone
code is detected in the signal. At other times, sound will be muted. Only functions
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