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Link: Basics of Radio Wave Propagation |
| Contents: Covers types of propagation, the Ionosphere with its different layers, solar events, and contains a glossary of solar/propagation terminology. |
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Link: DX Maps |
| Contents: Almost real time maps of DX activity covering LF to UHF. Shows activity over last hour. |
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Link: International Beacon Project |
| Contents: Northern California DX Foundation site with information about the IARU beacons on 20, 17, 15, 12, and 10 meters. |
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Link: NVIS Basics |
| Contents: Explains communications using near-vertical incident skywave propagation with proper antenna and frequency. |
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Link: Reverse Beacon Network |
| Contents: Check to see if anyone out there can hear your CQ and see the strength of your signal. |
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Link: WSPR |
| Contents: A digital software transmit package that implements a protocol designed for probing potential propagation paths with low-power transmissions. |