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Radio Propagation


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D-Region Absorption
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Created by PA4RM

ARRL’s EC-001-S online “Introduction to Emergency Communication” course is now available to students in an on-demand format, allowing students to register for the course and begin work at any time. This course is designed to provide basic knowledge and tools for any emergency communications volunteer.

In response to the great course demand and to expand access to EC-001, ARRL developed a self-g...

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