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VOACAP Quick Guide: HF Propagation Prediction and Ionospheric Communications Analysis
The Google Maps-based predictor is pretty cute: it'll give you a nice chart showing which frequencies should work well between two points throughout the day.
to hf propagation radio ... on 04 November 2010
Automatically-generated list of beacons.
to beacon ham propagation radio ... on 21 October 2010
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tasty by Adam Sampson.