Question
What tone is used to mark the end of a transmission when using repeater autopatch?
Answer Options
- A) Morse code prosign SK
- B) The pound sign (#)
- C) The asterisk sign (*)
- D) The 150.0 Hertz tone
Correct Answer: B
Explanation
An autopatch is a repeater function that allows licensed amateurs to temporarily connect their radio to the public telephone network, typically for emergencies or brief calls. The control signals are sent via DTMF (Dual-Tone Multi-Frequency - T2B06) tones from the radio’s keypad.
When using an autopatch, the pound sign (#) is the universal DTMF tone used to signal the repeater that the operator is finished with the phone call and wishes to disconnect the patch. The asterisk sign (\text{*}) is often used to initiate the autopatch, but the pound sign is the one used to hang up.
This topic was automatically created to facilitate community discussion about this exam question. Feel free to share study tips, memory tricks, or additional explanations!