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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

ARRL is launching a new magazine, On the Air, in January 2020. To be published on a bimonthly basis, On the Air will offer new and beginner-to-intermediate-level radio amateurs a fresh approach to exploring radio communication. Each issue will include advice and insights on topics from the variety of Amateur Radio interests and activities: radio technology, operating, equipment, project buildin...

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