Synchronous filter for VOR systems

Details Synchronous filter for VOR systems Synchronous filter for VOR systems

1976-01-14

1977-05-24

Farley, Richard A.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

324 83D, G01S 146

Patent

active

040259234

ABSTRACT:
A circuit which allows the operation of a VOR receiver in the presence of unwanted interference signals without sacrificing a fast response to omnirange bearing selector changes. A switching-type synchronous filter is used to filter the 30 Hz AM channel signal in the receiver. The narrow bandwidth of this synchronous filter rejects unwanted interference signals without introducing phase shift into the desired signal. The switching signal for the synchronous filter is generated by the FM channel in such a manner that the switching filter center frequency follows the input frequency. The use of a synchronous filter allows rejection of interfering AM signals that lie outside a narrow pass band, while allowing the receiver to follow variations in frequency of the transmitted signal.

REFERENCES:
patent: 3386096 (1968-05-01), Lundgreen et al.
patent: 3792473 (1974-02-01), Sawicki

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