Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1980-08-06
1982-10-26
Hubler, Malcolm F.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
116298, 116309, 116310, G01S 302, G09F 900
Patent
active
043564917
ABSTRACT:
A marine direction finding system is disclosed wherein a rotatable and calibrated dial is placed over a direction indicating dial of a radio direction finder. The radio direction finder indicates direction by illuminating a portion of its indicating dial. The direction of the radial signal received is referenced to a front of the boat which is calibrated as 0.degree.. The rotatable dial is preferably at least semitransparent and is calibrated at a first radius from 0.degree. to 360.degree. and at a second radius also from 0.degree. to 360.degree. but offset by 180.degree.. When a signal is received, the rotatable dial first radius marking is set to a 0.degree. marking on the direction finder in accordance with the current magnetic heading for both. The indicated direction on the radio direction finder indicating dial then illuminates through the rotatable dial and a corresponding reading on the rotatable dial from the first radius markings corresponds to a magnetic heading of the first boat to the second boat and the second radius reading corresponds to a heading for the second boat to the first boat.
REFERENCES:
patent: 1917268 (1933-07-01), Mirick
patent: 2232096 (1941-02-01), Dane
patent: 2933727 (1960-04-01), Padgett
patent: 3028599 (1962-04-01), Beck
patent: 3736061 (1973-05-01), Knowlden et al.
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