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Radio Propagation


Solar X-rays:
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Geomagnetic field:
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D-Region Absorption
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Created by PA4RM

As the September 30 date for the closing of the Official Observer program nears, ARRL has expressed deep appreciation to the hundreds of volunteers who gave their time as Official Observers (OOs) to help preserve the integrity of the Amateur Radio frequencies.

The Official Observer program has served the Amateur Radio community and assisted the FCC Enforcement Bureau for more than 85 years. The ...

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