Telecommunications – Transmitter and receiver at separate stations – Having measuring – testing – or monitoring of system or part
Patent
1996-12-06
1999-10-05
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at separate stations
Having measuring, testing, or monitoring of system or part
4552261, 340513, 340516, G08B 2900, H04B 1700
Patent
active
059638508
ABSTRACT:
A method and apparatus for testing a balanced diode mixer and local oscillator combination in a microwave receiver. The diodes comprising a balanced mixer are unbalanced in a selective, controlled manner to generate an offset signal. The unbalancing of the mixer is accomplished by heating one of a pair of mixer diodes. By measuring an offset voltage output of the balanced diode mixer after one of the diodes has been heated, it is possible to measure an artificially created diode mismatch offset voltage and thereby verify that the balanced mixer/oscillator combination is working properly. The heating step is performed by either forward biasing the mixer diode or by placing a resistive heating element adjacent to the diode.
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Barkume, P.C. Anthony R.
Eisenzopf Reinhard J.
Kincaid Lester G.
Pittway Corp.
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