Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1976-09-13
1978-02-07
Wilbur, Maynard R.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
G01S 130
Patent
active
040729508
ABSTRACT:
A navigation aid comprises two transmitters transmitting signals in the LF/MF range (250 kilohertz-490 kilohertz) and a receiver indicator for receiving each of the transmitted signals, translating them to a common frequency, and indicating the phase difference at any given position. Frequency stablizing means are coupled to each transmitter to stabilize the frequency of each transmitted signal and to prevent the differential frequency error from exceeding a selected limit.
REFERENCES:
patent: 3883874 (1975-05-01), Swanson
patent: 3889264 (1975-06-01), Fletcher
patent: 3928852 (1975-12-01), Barker
H.O. Publication No. 220, U.S. Navy Hydrographic Office, 1963, p. 175.
Berger Richard E.
Phillips T. M.
Rubens G. J.
Sciascia R. S.
Wilbur Maynard R.
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