Propagation Primer: a simple tutorial on HF (HIGH FREQUENCY or SHORTWAVE) Radio Propagation. Want to brush up on the basics? Forgot what the D Layer is? Wonder why AM broadcast radio stations come in from so far away at night? Confused about the numbers used in space weather reports? This is for YOU. Requires FLASH plugin, which you probably already have.
Find it at http://www.ae4rv.com/tn/propflash.htm
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