CTCSS / DCS tone reference

CTCSS tones do not provide privacy. Anyone without a tone set hears everything you say. Tones only control when the receiving radio's squelch opens.

DCS sends a low-speed digital word instead of an audio tone, written with a D prefix and an N or I suffix (D023N). N means the code as listed; I is its electrical inverse. If two radios can hear each other but the squelch never opens, try the inverted setting on one side. Of the 104 codes below, 83 are the standard alias-free set and interoperate across brands; the 21 shown in outline are extended codes that some radios offer but that can alias with other codes or pull the carrier. Prefer a standard code unless you have a reason not to. Like CTCSS, DCS is not privacy: anyone without a code set still hears everything.