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National Association of Broadcasters Engineering Handbook, 11th Edition by Garrison C. Cavell

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Chapter2.6

HF Shortwave Radio

Allocation, Design Methods, and Regulation

James E. O’Neal

Technology Consultant, TV Technology magazine

Alexandria, VA

Of all of the radiofrequency spectrum available or in use terrestrially, the portion that exists between approximately 2 and 30 MHz is unique, as it is here that global communications without the use of intermediate relay facilities is possible on a fairly reliable and predictable basis. Interestingly, this range of frequencies, with their potential for long-distance communication with modest amounts of transmitter power, was ignored by early adopters of wireless communication in the early 20th century, as the prevailing belief was that only the long wavelengths (greater than 200 meters or so) were ...

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