1974-09-18
1976-09-07
Griffin, Robert L.
325 17, 325420, H04B 104
Patent
active
039796787
ABSTRACT:
Pulse radar apparatus comprising at least an error voltage generator, a dither-tuned magnetron, a frequency control circuit, a conditional circuit and an angular position indicator connected to the magnetron tuning shaft for turning the local oscillator frequency f.sub.l to a frequency f.sub.lo, showing a fixed difference f.sub.o with the magnetron frequency, where f.sub.o = f.sub.z - 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.l, the frequency control circuit is alternatively supplied with an error voltage and a voltage proportional to ##EQU1## TO DELIVER A FINE AND A COARSE TUNING VOLTAGE, RESPECTIVELY.
REFERENCES:
patent: 2913718 (1959-11-01), Chapin
patent: 3121221 (1964-02-01), Sullivan et al.
Burgers Bernhardus Walter Antonius
Teulings Wilhelmus Antonius
Berka George B.
Griffin Robert L.
Hearn Robert
Hollandse Signaalapparaten B.V.
Trifari Frank R.
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