Direction finder

Details Direction finder Direction finder

1979-12-26

1981-12-22

Blum, Theodore M.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

G01S 504

Patent

active

043074022

ABSTRACT:
A direction finder having two directive loop antennas mutually orthogonally disposed and a non-directional vertical antenna. Due to the difference in line constant between the loop antenna channels and the vertical antenna channel, the voltage signals induced in one of the loop antennas can not be combined with the ones induced in the vertical antenna in a mutual phase relationship of the same or the opposite phase, which causes errors in measuring a correct bearing of a source of incoming signals. Such errors in bearing indication are eliminated by combining the voltage signals induced in one of the loop antennas and in the vertical antenna to obtain positive phase and negative phase combined voltage signals with 180.degree. out of phase to one another, and by generating driving signals for an indicator based on the rectified voltage signals from the vertical antenna and the rectified combined signals appropriately selected.

REFERENCES:
patent: 3344430 (1967-09-01), Hildebrand
patent: 3795001 (1974-02-01), Poppe et al.
patent: 3987446 (1976-10-01), Lipsky et al.
patent: 4194207 (1980-03-01), Zauscher

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