Question
What signals are used in a computer-radio interface for digital mode operation?
Answer Options
- A) Receive and transmit mode, status, and location
- B) Antenna and RF power
- C) Receive audio, transmit audio, and transmitter keying
- D) NMEA GPS location and DC power
Correct Answer: C
Explanation
To successfully run digital modes like FT8 (T4A04), a computer-radio interface must manage three essential signal paths between the computer and the radio. First, it needs the receive audio coming from the radio (to decode the signal). Second, it needs to send the encoded digital audio to the radio for transmission (transmit audio).
Third, and critically, the computer must be able to put the radio into transmit mode, which requires a signal for transmitter keying (often the PTT - Push-to-Talk) line. All three of these audio and control signals are required to make a modern digital mode interface functional.
This topic was automatically created to facilitate community discussion about this exam question. Feel free to share study tips, memory tricks, or additional explanations!