Mobile direction comparator

Details Mobile direction comparator Mobile direction comparator

1975-09-10

1977-05-24

Wilbur, Maynard R.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343113PT, G01S 504

Patent

active

040259242

ABSTRACT:
A Mobile Directional Comparator (MDC) used in combination with a communications receiver to process received signal information from a two port antenna system to drive a directional indicator. A radio frequency modulator modulates two received cardioid antenna signal patterns with two low frequency sine wave signals at a low modulation percentage and out of phase with each other. The two modulated cardioids are then combined in a hybrid circuit to produce a non-directional radio frequency signal pattern with respect to the antennae center axis. The combined modulated rf signal is carried through the receiver as a normal signal, and the intermediate frequency output of the receiver is processed by a phase demodulator in the MDC to extract from the signal phase and amplitude information to drive the directional indicator.

REFERENCES:
patent: 2997710 (1961-08-01), Contuno
patent: 3453627 (1969-07-01), Lode
patent: 3916411 (1975-10-01), Fiedler

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