VHF Directional receiver

Details VHF Directional receiver VHF Directional receiver

1981-05-06

1983-10-18

Wilbur, Maynard R.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343767, 455269, 455351, G01S 502

Patent

active

044108907

ABSTRACT:
A miniature handheld receiver contained in a metal shielding enclosure incorporating a slot type directional antenna as a part of the structure such that when the antenna is aligned with a radio frequency signal of interest, a null is produced in the signal level. The antenna is coupled to receiver circuitry which includes an oscillator used to FM modulate the signal by tone injection when an unmodulated carrier is present, an FM detector for demodulating the RF signal, an audio amplifier for amplifying the demodulated audio and an acoustically coupled earphone to prevent stray RF pickup from the earphone cord.

REFERENCES:
patent: 2555443 (1951-06-01), Harvey
patent: 2573438 (1951-10-01), Hathaway et al.
patent: 3018369 (1962-01-01), Holmes
patent: 3094663 (1963-06-01), Siegel
patent: 3115635 (1963-12-01), Leeming et al.
patent: 3323129 (1967-05-01), Held
patent: 3683384 (1972-08-01), Warren
patent: 3965425 (1976-06-01), Peterson et al.,
patent: 4003060 (1977-01-01), Broce et al.
patent: 4263597 (1981-04-01), Bentley et al.

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