THE OSAKA TUBE AS AN OSCILLATOR IN THE SHORT MILLIMETER WAVES
OSAKA UNIV (JAPAN)
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A Barkhausen-Kurz type electron tube with a con fining d.c. magnetic field, the so-called Osaka Tube, was designed and fabricated to operate at 2.5 mm wave length with a purpose to study the possibility of its practical fabrication. Oscillation was detected at a wavelength of 2.5 mm at a magnetic field of 4,000 gauss and an anode voltage of 800 volts. No special precision machining was adopted, and therefore the output and efficiency were not the prime purpose of this experiment other than to find the possibility of oscillation. Owing to the restricted cathode area of 0.1 mmsquare, it was anticipated that at best an emission current of 1 ma would be drawn. However, actually, an emission current of 4 ma resulted, which indicates that further reduction of operating wave length may be possible. Problems still remain in the mechanical tuning construction and also in the improvement of efficiency, the solution of which lies in the precision of the machining process.
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