Yoji Ito
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Yoji Ito was an engineer and scientist who had a major role in the Japanese development of magnetrons and the Radio Range Finder.
Yoji photo
Barkhausen–Kurz tube
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The Barkhausen–Kurz tube, also called the retarding-field tube, reflex triode, B–K oscillator, and Barkhausen oscillator, was a high frequency vacuum tube electronic oscillator invented in 1920 by Ger
Yoji Ito
…communications, and wanted to investigate the interaction of microwaves with the Kennelly–Heaviside layer (the ionosphere). He started a project using a Barkhausen–Kurz tube, then tried a split-anode cavity magnetron developed by Kinjiro Okabe at Tohoku University, but the frequency was too unstable. In late 1932, believing…
The first experimental microwave relay system, a 1.7 GHz link 40 miles across the English channel in 1931, used a Barkhausen-Kurz tube mounted at the focus of the 10 foot dish shown. It had a radiated power of about 1⁄2 watt.
UHF Barkhausen Kurz Lecher line transmitter 1933
UHF Barkhausen Kurz Lecher line transmitter 1933 closeup