Temperature controlled resistive-liquid dummy load

Details Temperature controlled resistive-liquid dummy load Temperature controlled resistive-liquid dummy load

1988-08-26

1990-07-03

Safourek, Benedict V.

Telecommunications

Transmitter

Measuring, testing, or monitoring of transmitter

330143, 333 22F, H04B 172

Patent

active

049397877

ABSTRACT:
A dummy load for a radio frequency transmitter uses a resistive liquid within a tube of non-conducting material as the load. The tube has grounded conductors at each end, and a centrally-located terminal that provides a load, with respect to ground, across two parallel branches. The output of the radio frequency transmitter is applied between the centrally-located terminal and ground. The ends of the tube are connected into a closed liquid loop that includes a temperature controlling system with a circulating pump, a heater for raising the temperature of the resistive liquid to a given, operating level, if necessary, and a heat exchanger for lowering the temperature of the resistive liquid to the given, operating level, when necessary; whereby the heat generated by the output of the transmitter can be dissipated, and the temperature of the resistive liquid, within the tube, kept at a constant mean temperature to provide a constant resistance under all load conditions.

REFERENCES:
patent: 3617924 (1971-11-01), Fujita et al.
patent: 3660784 (1972-05-01), Scharfman
patent: 3796973 (1974-03-01), Klein
patent: 3906402 (1975-09-01), Lesyk
patent: 4262246 (1981-04-01), Fujii
patent: 4286238 (1981-08-01), Ursenbach
patent: 4799031 (1989-01-01), Lang et al.

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