GeneralG1E10
Why should an amateur operator normally avoid transmitting on 14.100, 18.110, 21.150, 24.930 and 28.200 MHz?
A
Answer
General class rules and operating privileges
Type
A
A system of propagation beacon stations operates on those frequencies
B
A system of automatic digital stations operates on those frequencies
C
These frequencies are set aside for emergency operations
D
These frequencies are set aside for bulletins from the FCC
Answer Notes
The frequencies listed (14.100, 18.110, 21.150, 24.930, and 28.200 MHz) are coordinated internationally for the International Beacon Project (IBP), which operates a worldwide network of propagation beacons. These beacons transmit sequentially to help amateurs and researchers evaluate real-time propagation conditions across different high-frequency (HF) bands.
Because these beacons operate on very specific, narrow frequencies, transmitting over them causes harmful interference and disrupts their primary purpose. They are not emergency frequencies, digital automated station frequencies, or FCC bulletin channels.
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On what bands may automatically controlled stations transmitting RTTY or data emissions communicate with other automatically controlled digital stations?