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SIGNALING
CTCSS
You may sometimes want to hear calls only from specific persons. The
Continuous Tone Coded Squelch System (CTCSS) allows you to ignore (not
hear) unwanted calls from other persons who are using the same frequency. To
do so, select the same CTCSS tone as selected by the other persons in your
group. A CTCSS tone is subaudible and is selectable from among 42 tone
frequencies.
Available CTCSS Frequencies
CTCSS Frequency (Hz)
67.0 82.5 100.0 123.0 151.4 186.2 225.7
69.3 85.4 103.5 127.3 156.7 192.8 229.1
71.9 88.5 107.2 131.8 162.2 203.5 233.6
74.4 91.5 110.9 136.5 167.9 206.5 241.8
77.0 94.8 114.8 141.3 173.8 210.7 250.3
79.7 97.4 118.8 146.2 179.9 218.1 254.1
Note: CTCSS does not cause your conversation to be private. It only relieves you from
listening to unwanted conversations.
USING CTCSS
1 Press [TONE] 2 times to turn the CTCSS function ON.
• Each time you press [TONE], the selection changes as follows:
Tone (
) ➡ CTCSS ( ) ➡ DCS ( ) ➡ Cross Tone ( ) ➡ Off (no display).
• The “ ” icon appears when the CTCSS function is ON.
2 Press [T.SEL].
• The current CTCSS frequency appears on the display and blinks.
3 Rotate the ENC control to select your desired frequency.
• To exit the CTCSS frequency selection, press [PTT].
4 Press any key other than [MONI], [LAMP], or [PTT] to set the selected
frequency.
5 When you are called: The transceiver squelch opens only when the selected
CTCSS tone is received.
When you make a call: Press and hold [PTT], then speak into the
microphone.