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Ham Radio > D-region
The following information is about D-region.
D-region Defined
D-layer - The lowest region of the ionosphere found approximately 25 to 55 miles above Earth; it fades away quickly after sunset and sometimes does not form at all on short winter days. The main impact of the D-layer on radio propagation is to absorb energy from signals passing through it. - See URL - Propagation
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