What type of signaling to a repeater uses two simultaneous audio tones?
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DTMF is the same dual-tone scheme used by telephone keypads, where each digit is a pair of simultaneous audio tones. CTCSS uses a single sub-audible tone instead.
DTMF is the same dual-tone scheme used by telephone keypads, where each digit is a pair of simultaneous audio tones. CTCSS uses a single sub-audible tone instead.