G - Physics
01
R
324/70
G01R 19/00 (2006.01) G01R 21/00 (2006.01)
Patent
CA 1202680
RF WATTMETER ABSTRACT OF THE DISCLOSURE An RF wattmeter is disclosed of the type using an "insertion-type" pick-up element to produce a voltage wave signal corresponding to the measured power in the coaxial transmission line. The induction loop in the pick-up element is connected to a principal detector, and a secondary detec- tor is connected in opposition to the principal detector. Both detectors are located in close proximity to each other and are subject to the same diode thermal environment. A sine wave generator supplies a wave signal to the secondary detector in opposition to the wave signal supplied to the principal detector from the inductive loop. The d.c. portion of the resulting signal representing the difference between the opposed signals is integrated, and the integrated output is used as the amplitude in the generated sine wave. When the circuit is in balance, the integrated output matches the amplitude of the inductive wave form and can be used as an output indicating measured power in the coaxial transmission line.
433944
Bird Electronic Corporation
Macrae & Co.
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