Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1978-09-07
1980-08-26
Tubbesing, T. H.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343728, G01S 320
Patent
active
042198216
ABSTRACT:
An automatic direction finding (ADF) system including a direction finding antenna array which connects to a radio receiver to process an audio output signal selectively illuminating a segment of a segmented circular visual directional display indicating the direction from which the received signal arrived. In an FM version, the ADF system electronically switches between antennas in the direction finding antenna array alternately incorporating vector information onto the received carrier in a manner that can be phase detected to produce an audio frequency signal within the normal pre-audio bandpass of the receiver. The audio frequency is then demultiplexed to produce separate vector signals. These separate vector signals are then processed for selectively illuminating a segment of the segmented circular visual directional display. When a sufficiently strong signal is not being received, the ADF system sequentially illuminates each segment of the segmented circular visual directional display in a clockwise direction at a rate which can be readily and visably perceived by an operator. This operation conveys the image of circuit activity, is exciting for an operator to watch, and may have the effect of simulating a radar sweep, although it is in no way related to the searching by the receiver. An additional segment is positioned in the center of the display to indicate the processing of a received radio frequency signal by the ADF system.
REFERENCES:
patent: 2419673 (1947-04-01), Busignies et al.
patent: 3490024 (1970-01-01), Sherrill et al.
patent: 3824596 (1974-07-01), Guion et al.
Terrence Rogers, A Dopple ScAnt, QST, May 1978, pp. 24-28.
Regency Electronics Inc.
Tubbesing T. H.
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