Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1980-10-22
1983-05-24
Blum, Theodore M.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
G01S 144
Patent
active
043852998
ABSTRACT:
An electronic navigation beacon, particularly for coastal navigation, in which an unmodulated carrier f.sub.c is transmitted from the first antenna of a pair of antennas, and a periodically modulated sideband f.sub.c .+-.f.sub.a is transmitted from both antennas, where f.sub.a is in the audio frequency domain. A cyclical RF phase variation is imposed on the sideband signal transmitted from the second antenna. The effect in space is that of a rotating radial having an audio frequency null, the periodic modulation providing the listener at a remote point with timing information enabling determination bearing as a function of the time of passage of the radial through the remote point relative to the start of rotation of the radial.
REFERENCES:
patent: 3173093 (1965-03-01), Most et al.
Earp, deceased Charles W.
Johannessen Rolf
Overbury Francis G.
Wickenden, executor Clive D.
Blum Theodore M.
International Standard Electric Corporation
Kristofferson T. E.
O'Neil W. T.
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