Question
What type of modulation is commonly used for VHF packet radio transmissions?
Answer Options
- A) FM or PM
- B) SSB
- C) AM
- D) PSK
Correct Answer: A
Explanation
Packet radio is a digital mode (T8D01) that packages data into bursts, similar to how computers send data over the internet. On the VHF and UHF bands, packet radio typically uses a form of frequency modulation to transmit these data bursts.
The modulation used is FM (Frequency Modulation) or PM (Phase Modulation), where the frequency of the carrier signal is shifted slightly up or down to represent the data bits (ones and zeros). This is consistent with most other VHF/UHF amateur operations, including repeaters (T8A04), which use FM for its high-quality audio characteristics in a strong signal environment.
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