Oscillators – With frequency calibration or testing
Patent
1994-09-27
1996-07-16
Grimm, Siegfried H.
Oscillators
With frequency calibration or testing
331 87, 331 90, 331 91, 315 3961, H03B 104, H03B 910
Patent
active
055370845
ABSTRACT:
An improved low power pulsed anode magnetron is provided having a cylindrical cathode centrally disposed within a plurality of radial anode vanes. An interaction region is provided between the surface of the cathode and the anode vane tips. A ratio of the anode-to-cathode space over the center-to-center distance between adjacent vane tips is within a range between 0.95 and 1.05. The cathode is joined to a magnetic polepiece assembly which channels magnetic flux to the interaction region. Both the cathode and the polepiece are mechanically adjustable from external to the magnetron to reposition the cathode and polepiece with respect to the anode vanes. The cathode surface is formed from an active nickel alloy which is cleaned by a chemical process followed by a high temperature and vacuum firing. An emissive surface is applied over the cleaned cathode surface. The output spectrum of the magnetron is calibrated by applying a sequential pulsed input of increasing amplitude, and adjusting the relative cathode-anode position until the frequency spectrum remains constant.
REFERENCES:
patent: 4338545 (1982-07-01), Koinuma et al.
patent: 4831341 (1989-05-01), Brady
"Vacuum Tubes" by Spangenberg, McGraw-Hill 1948, pp. 660-661.
Grimm Siegfried H.
Litton Systems Inc.
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