Continuous Tone Coded Squelch System (CTCSS)
Continuous Tone Coded Squelch System (CTCSS) allows a group of radios set with the same tone to converse on a channel without hearing other radios using that channel. CTCSS can be used to silence a radio until another radio with the same tone transmits. This allows monitoring of a channel for transmissions from radios set with the same tone without hearing other conversations that use different or even no tone.
The use of CTCSS is not permitted on UHF CB repeaters.
Read more about this topic: UHF CB
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