Amateur ExtraE1F01
On what frequencies are spread spectrum transmissions permitted?
B
Answer
Extra class rules and station restrictions
Type
A
Only on amateur frequencies above 50 MHz
B
Only on amateur frequencies above 222 MHz
C
Only on amateur frequencies above 420 MHz
D
Only on amateur frequencies above 144 MHz
Answer Notes
Spread spectrum is a wideband mode that consumes a significant amount of spectrum, making it unsuitable for the crowded lower frequency bands like HF or 2 meters. According to FCC Part 97 rules, spread spectrum transmissions are restricted to higher frequency bands to prevent interference with other narrowband communications.
Therefore, spread spectrum is only authorized on amateur frequencies above 222 MHz (the 1.25-meter band and higher). Distractors suggesting 50 MHz, 144 MHz, or 420 MHz are incorrect because they either specify bands where bandwidth is at a premium or miss the exact legal starting point of the 222 MHz band.
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