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What is CTCSS (the 38 codes)?

April 26, 2017ctcss

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What is CTCSS (the 38 codes)?

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CTCSS stands for “Continuous Tone Coded Squelch System”. If a CTCSS tone is selected, a CTCSS sub-audible tone is transmitted along with the regular voice audio by the transmitting radio. The receiving radio, set to the same CTCSS tone, will only receive audio if it contains that sub-tone. Interference from other users on the same frequency is therefore rejected (unless they are also on the same sub-tone). This is a way of allowing groups of users of walkie-talkies on the same channel to avoid hearing messages from other nearby users.