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T2B06
What type of signaling to a repeater uses two simultaneous audio tones?
Pick an answer to check it.
Answer: A. DTMF
DTMF (Dual-Tone Multi-Frequency) sends two audio tones at once for each key, just like a telephone keypad. It is often used to send control commands to a repeater. CTCSS uses a single sub-audible tone.
Tip: Dual-Tone = two tones; it's the touch-tone phone sound.