Single tone technique for measuring IM distortion

Details Single tone technique for measuring IM distortion Single tone technique for measuring IM distortion

1976-12-23

1978-05-09

Krawczewicz, Stanley T.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

17917531R, 325 67, G01R 2700

Patent

active

040889483

ABSTRACT:
Third order IM distortion in a microwave repeater is measured in situ by applying a small amount of low frequency amplitude-modulation to the payload signal while at the same time adding a test-tone of fixed frequency and amplitude. At the repeator's output, a pair of synchronous detectors, driven in phase quadrature by the test-tone generator, measure the modulation depth of the test-tone. This modulation depth is now a measure of the degree of distortion in the repeater.

REFERENCES:
patent: 3875512 (1975-04-01), Baranyi et al.
patent: 3913011 (1975-10-01), Hughes et al.
patent: 4028622 (1977-06-01), Evans et al.

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