What is the function of a transceiver’s PTT input?
Input for a key used to send CW
Switches transceiver from receive to transmit when grounded✓الإجابة الصحيحة
Provides a transmit tuning tone when grounded
Input for a preamplifier tuning tone
الشرح
PTT stands for push to talk, and the input is an active-low control line: grounding it, normally through a microphone button or a foot switch, puts the radio into transmit. It carries no audio and no keying tone.