Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1977-12-14
1980-01-01
Hubler, Malcolm F.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
325364, 343774, G01S 740, H04B 1700
Patent
active
041819101
ABSTRACT:
A hand-carried and self-contained receiver and indicator for producing a signal when the presence of pulsed (or pulsed doppler) radar operation is detected, either in a broad band containing all the common radar pulse frequencies, or in a limited band whereby those outside the band are rejected. A simple biconical horn antenna is provided at one end of a very short coaxial line leading to a broadband detector. From the detector, a flexible transmission line connects to the remaining receiver circuitry containing, in one mode of operation, an amplifier, a limiter, a retriggerable multivibrator and an audible beep type of tone generator driving an earphone. In another mode of operation, the retriggerable multivibrator is replaced by a dual tuned circuit having a substantially restricted bandwidth for passing only a desired pulse frequency signal.
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patent: 3550008 (1970-12-01), Bright
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patent: 3657655 (1972-04-01), Fukata
patent: 3660844 (1972-05-01), Potter
patent: 3795914 (1974-03-01), Pickles
patent: 3978797 (1976-09-01), Harrington
Graham Willard M.
Hubler Malcolm F.
Northrop Corporation
Rundle William W.
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