Question
On which of the following bands is image transmission prohibited?
Answer Options
- A) 160 meters
- B) 30 meters
- C) 20 meters
- D) 12 meters
Correct Answer: B
Explanation
Similar to phone operation, the use of image transmissions, such as slow-scan television (SSTV) or fast-scan TV (ATV), is restricted on the 30\text{-meter} band. This band, allocated from 10.100 \text{MHz} to 10.150 \text{MHz}, is reserved exclusively for narrow-band digital and CW emissions to ensure compatibility with primary users. Image modes generally require a wider bandwidth than the authorized narrow-band modes, making them prohibited.
This is part of the same regulation that prohibits phone emissions on this band, \S 97.305. Limiting the bandwidth of signals in the 30\text{-meter} band is necessary because the amateur service is not the primary user in this segment. The narrow-band restriction helps contain the amateur footprint and respects the international sharing agreements for the band.
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