Squelch Codes / Private Lines / Privacy Guard / Quiet Channel / (CTCSS/PL/CG/QC, DCS/DPL/DCG/DTCS)Ī squelch tone/code is often referred to as a "sub-channel." These come in two forms, CTCSS (Continuous Tone-Coded Squelch System), an analog variety, and DCS, (Digital-Coded Squelch), a digital variety. Different frequencies act as different "channels", it is essentially the same as broadcast radio or broadcast/regular cable TV channels you can only receive or transmit on the channel you are tuned to. The frequency determines the portion of the airwaves that is used to transmit and receive broadcasts (voice communications). I just wanted to make a more complete post that should help clarify frequencies/channels/codes for everyone. They are only compatible with other radios of their same make & model (unless no one uses a subchannel). **RadioShack, Motorola Sport, and Cherokee Radios do not follow this format and will not be compatible with other radios or each other.
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*This is the standard accepted subchannel code for Cobra, Midland, and Motorola TalkAbout radios. However, if the user attempts to transmit without the subchannel, the other user who was using a subchannel will not hear them.
Most radios will listen for any CTCSS tone and will allow any traffic when no subchannel is selected. Only someone who has tuned in and is listening for the same code will hear the transmission. These are a non-audible tone given by the radio to restrict who can hear the transmission. CTCSS (Continuous Tone Coded Squelch System) or PL Tone
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