National Radio's 50th Anniversary Album

Post-war military requirements demanded R & D leadership -- and National pioneered tropspheric scatter techniques for ultra-reliable military communications. Shown is the 10KW final amplifier of National's Transhorizon system.

This 50KW transmitter is part of NATO's main communications trunk -- the "Ace High" tropo system.

The popular NC-125 incorporated the famous "Selectoject" variable audio filter -- a boon to the CW man!

National's FSK-4 is a 30-65Mc tropospheric scatter RTTY system. The FSK-4 and similar earlier National tropo systems are in active use in U.S. Army world-wide communications.

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