Question
What is the maximum symbol rate permitted for RTTY or data emission transmitted at frequencies below 28 MHz?
Answer Options
- A) 56 kilobaud
- B) 19.6 kilobaud
- C) 1200 baud
- D) 300 baud
Correct Answer: D
Explanation
For RTTY or data emissions transmitted on frequencies below 28 \text{MHz} (the 10\text{-meter} band), FCC Rule \S 97.307(\text{f})(3) establishes a maximum symbol rate of 300 baud. A symbol rate is the number of times per second that the signal’s characteristics (like frequency or phase) can change.
This limitation is designed to keep the transmitted bandwidth narrow, helping to preserve the narrow-band nature of the lower HF spectrum and minimize the potential for interference. On the 10\text{-meter} band and above, this restriction is greatly relaxed to allow for higher speed data modes, reflecting the different nature of VHF/UHF propagation and usage.
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