HF radio systems and techniques annoucement
2015
Up to the 1960's most telecommunication between the continents was realized by large HF (3 to 30MHz) radio systems especially built for that purpose, using the ionosphere as a natural high altitude 'reflector'. Inventions such as adaptive beamforming, antenna diversity, and frequency diversity stem from the 1930's, an impressive achievement considering the technology of that time.
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