Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1974-06-14
1977-01-04
Hubler, Malcolm F.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
325 17, 343 5AF, G01S 902
Patent
active
040018253
ABSTRACT:
Pulse radar apparatus provided with a control circuit comprising at least an error voltage generator, a dither-tuned magnetron and a servo unit driving this magnetron, and also with a conditional circuit and an angular position indicator connected to the servo motor shaft for tuning the magnetron frequency f.sub.z to a frequency f.sub.zo, showing a fixed difference f.sub.o with the local frequency f.sub.lo, where f.sub.o = f.sub.zo - f.sub.lo. When, by means of the indicator, the conditional circuit determines that the magnetron is being tuned in a defined frequency range comprising the frequency f.sub.zo, the auxiliary voltage (V.sub.1), used to coarse tune to frequency f.sub.zo is replaced by a fine tuning error voltage proportional to .vertline.f.sub.z - f.sub.lo .vertline. - .vertline.f.sub.o .vertline.. This error voltage is delivered by the generator supplied with the local oscillator signal and a sample of the magnetron pulse.
REFERENCES:
patent: 2550519 (1951-04-01), Bataille
patent: 2568412 (1951-09-01), Robinson
patent: 2677058 (1954-04-01), Kirkman
patent: 2746031 (1956-05-01), Zaffarano
patent: 2806137 (1957-09-01), Myers
patent: 2933598 (1960-04-01), Heller et al.
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patent: 3320611 (1967-05-01), Sekimoto et al.
patent: 3374480 (1968-03-01), Russell et al.
patent: 3487407 (1969-12-01), Lennon, Jr. et al.
Berka George B.
Hubler Malcolm F.
Trifari Frank R.
U.S. Philips Corporation
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