Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1980-09-11
1982-06-08
Krawczewicz, Stanley T.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 84, 324126, G01R 2704
Patent
active
043341870
ABSTRACT:
A phase sensing device is described which is useful for indicating the reance condition of a complex load impedance (such as an antenna), with a high degree of accuracy over the frequency range from 3 to 100 MHz. The device uses readily available transmission line and solid state components to provide a .+-. indication of the phase condition of the load; a zero crossing indicates resonance. Such a signal is useful for controlling an automatic turning mechanism that could be used in a tunable antenna. The extremely broadband operation and no physical connection to the main RF line are salient features of the device. The components are a transmission line coupler with a short pick-up wire mounted adjacent to the center conductor, two diodes with like electrodes (cathodes) connected to opposite ends of the pick-up wire, a carbon resistor between the other electrodes of the diodes, and a zero center meter across the resistor.
REFERENCES:
patent: 2442606 (1948-06-01), Korman
patent: 4262246 (1981-04-01), Fujii
Edelberg Nathan
Krawczewicz Stanley T.
Murray Jeremiah G.
Redman John W.
The United States of America as represented by the Secretary of
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