Question
What is the function of a transceiver’s PTT input?
Answer Options
- A) Input for a key used to send CW
- B) Switches transceiver from receive to transmit when grounded
- C) Provides a transmit tuning tone when grounded
- D) Input for a preamplifier tuning tone
Correct Answer: B
Explanation
The abbreviation PTT stands for Push-To-Talk. The PTT input is the primary electronic control line that changes the radio’s state. Its function is to immediately switch the transceiver from receive to transmit when grounded (connected to the common ground of the circuit).
This line is typically controlled by the physical PTT button on a microphone, a foot switch, or an external device (like a digital mode interface) to initiate a transmission instantly. Pressing the button breaks the connection to ground, putting the radio back into receive mode.
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