Question
Which type of modulation is commonly used for VHF and UHF voice repeaters?
Answer Options
- A) AM
- B) SSB
- C) PSK
- D) FM or PM
Correct Answer: D
Explanation
The modulation type most commonly used for local and wide-area voice communications on VHF and UHF amateur repeaters is FM (Frequency Modulation) or PM (Phase Modulation). In these modes, the voice signal varies the frequency (FM) or phase (PM) of the carrier wave.
FM provides high-quality, clear, and stable audio reproduction in a strong signal environment, which is characteristic of repeater coverage. While SSB is used for weak-signal work (T8A03), FM is used for high-quality local ragchew and emergency traffic.
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