Elimination of extraneous modulation from VHF omnirange receiver

Details Elimination of extraneous modulation from VHF omnirange receiver Elimination of extraneous modulation from VHF omnirange receiver

1975-11-07

1977-08-09

Wilbur, Maynard R.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

325476, G02S 144

Patent

active

040414930

ABSTRACT:
A VHF omnirange receiver subject to extraneous amplitude modulation of the carrier close to the frequency of a variable phase VOR modulation signal with a subcarrier frequency modulated by a fixed phase signal at the frequency of the variable phase signal is adapted for elimination of the effect of the extraneous modulation. Amplitude modulation of the subcarrier is detected and amplified with phase reversal with amplification in an amount equal to the ratio of the carrier amplitude to the subcarrier amplitude to produce a cancellation signal. The cancellation signal is added to the composite received signal to eliminate the effects of unwanted modulation at the frequency on the carrier.

REFERENCES:
patent: 3653047 (1972-03-01), Anthony
patent: 3763491 (1973-10-01), Ishman
patent: 3868577 (1975-02-01), Watt
patent: 3870996 (1975-03-01), Miller

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