Goniometer circuit for VOR system

Details Goniometer circuit for VOR system Goniometer circuit for VOR system

1978-10-27

1980-01-29

Tubbesing, T. H.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

G01S 108

Patent

active

041863992

ABSTRACT:
The present invention relates to an improved goniometer circuit having extremely low modulation harmonic distortion characteristics, which is particularly suitable for use in a VOR navigation system. In the disclosed circuit, modulation harmonic distortion is greatly reduced by the use of a phase lock loop operating at small signal levels prior to the power amplification stage of the system. The phase lock loop employs a voltage controlled oscillator to completely eliminate harmonic distortion so that the final output of the system is virtually modulation free.

REFERENCES:
patent: 3553590 (1971-01-01), Hofgen
patent: 3979751 (1976-09-01), van den Berg
patent: 4125836 (1978-11-01), Stavis

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