A) CTCSS
NJ2X Notes:
Continuous Tone-Coded Squelch System or CTCSS is used to reduce interference on a shared two-way radio communications frequency. Instead of opening the receive audio for any signal, CTCSS causes the two-way radio receiver's audio to open only in the presence of the normal RF signal and the correct sub-audible audio tone (sub-audible meaning that the receiver circuitry can detect it, but is unheard by the users in the audio output).
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| Kenwood TH-F6A has built-in Continue Tone-Coded Squelch System (CTCSS) |
