Radio stations that cannot communicate directly due to distance, terrain or other difficulties sometimes use an intermediate radio relay station to relay the signals. Examples include airborne radio relay, microwave radio relay, and communications satellite. The American Radio Relay League was founded for this purpose but did not change its name w...
Found on
http://en.wikipedia.org/wiki/Radio_relay
(from the article `military communication`) Radio relay, born of the necessity for mobility, became the outstanding communication development of World War II. Sets employing frequency ...
Found on
http://www.britannica.com/eb/a-z/r/4
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