GeneralG1B09
On what HF frequencies are automatically controlled beacons permitted?
D
Answer
General class rules and operating privileges
Type
A
On any frequency if power is less than 1 watt
B
On any frequency if transmissions are in Morse code
C
21.08 MHz to 21.09 MHz
D
28.20 MHz to 28.30 MHz
Answer Notes
A beacon station transmits continuously or at set intervals to help others observe radio propagation and reception. Because automatically controlled beacons transmit without a human control operator actively initiating each transmission, they are confined to specific frequency segments to prevent widespread interference.
Under FCC Part 97 rules, the only HF frequency segment where automatically controlled beacons are permitted is on the 10-meter band, specifically between 28.20 MHz and 28.30 MHz. They are not permitted on other HF bands or randomly scattered based on power levels or modulation types.
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What is the power limit for beacon stations?