Question
Which of the following is an acceptable bandwidth for digital voice or slow-scan TV transmissions made on the HF amateur bands?
Answer Options
- A) 3 kHz
- B) 10 kHz
- C) 15 kHz
- D) 20 kHz
Correct Answer: A
Explanation
FCC rules limit the maximum bandwidth for most emissions on the HF (High Frequency) amateur bands to protect the frequency spectrum and allow for many users to share the limited resources. The maximum allowable bandwidth for emissions below 29.7 MHz is generally dictated by the rule that amateur signals should occupy no more frequency than necessary to transmit the information.
For SSB (Single-Sideband), digital voice, and slow-scan TV (SSTV) transmissions in the HF bands, the bandwidth is typically limited to 3 kHz. Wider bandwidths like 10 kHz, 15 kHz, or 20 kHz would be considered excessive for these modes and are generally reserved for modes like Fast-Scan TV (FSTV) or certain wide-band data, which are typically confined to the VHF and UHF bands and above.
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