Digital squelch code (DCS)
A slow digital code sent under FM voice, doing the same job as a sub-audible tone.
ModeDigital squelch code
FamilyTone signaling
Audio exampleComing
What does it sound like?
Plate 11Tone signaling
Usually inaudible; sometimes a faint low rumble.
Field marksA slow digital code under the voice134.4 bits per secondEnds with a short turn-off code
Who uses it?
Repeaters, businesses and family radios.
Where and when can I hear it?
Under FM voice on VHF/UHF.
What do the decoded parts mean?
- Code: A three-digit code such as 023 that radios must match to hear each other.
Easily confused with
- Sub-audible tone (CTCSS / PL), from the same family