July 2017
Intermediate to advanced
1988 pages
112h 28m
English
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Chapter2.6
HF Shortwave Radio
Allocation, Design Methods, and Regulation
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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