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Perera's Telegraph Collectors Reference CD -- Now Shipping! -- A complete source of information for all those interested in telegraph keys from beginner to avid collector.

The Story of the Enigma: History, Technology and Deciphering -- Now Shipping! -- The ultimate reference on the Enigma!

RSGB 1940s Amateur Radio Special Edition -- 6 book set.

50 Years of Innovation w/ Bonus Calendar -- Out-of-Stock. Reprint Coming Soon! -- This guided tour of more than 400 legendary radios from 1930 to 1980, depicts the “golden age” of American radio technology.

Crystal Clear: The Struggle for Reliable Communications Technology in World War II -- Now Shipping! -- A story of the quartz crystal—a technology that changed the tide of World War II.

General Class License Manual

Chapter 7 – Propagation

Once a signal is traveling between antennas, how does it get from Point A to Point B? What makes bands open and close? How do the solar cycle and the seasons affect propagation? Section 7 introduces you to the exciting world of HF propagation.

Propagation

Beacon Stations

Solar Activity and Geophysical Information

 

    



Page last modified: 11:08 AM, 07 Jun 2007 ET
Page author: webmaster@arrl.org
Copyright © 2007, American Radio Relay League, Inc. All Rights Reserved.