Thursday, November 12, 2009

HF propagation prediction tools

The Austrailian government has a REALLY nice set of free Web based HF prediction tools. Check them out at: IPS Radio and Space Services. Below is a screen capture of an HAP (Hourly Area Prediction) plot that shows the usable frequencies centered on N. California. This plot covers 4-9PM (UTC -8 time zone). It shows what we already know, 75 is good in the early evening. After 5PM 75 "goes long" and 160 is the place to be. Note that at 8PM even 160 goes long and there is no short skip at all.

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