Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1979-06-18
1983-07-26
Heyman, John S.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
340825, 455183, 377 45, 377110, 377125, H03J 504, H03J 500, H03K 2130
Patent
active
RE0313270
ABSTRACT:
A proportional digital control system for radio frequency synthesizers using binary coded decimal control to a frequency synthesizer tunable in contiguous small interval increasing or decreasing steps throughout the frequency bandwidth range of operation. A fine tune dial switch circuit generates a two signal output with one a step count signal and the other an up-down control signal generated only upon rotation of the fine tuning dial and with the signal pulse rates thereof a direct function of the rate of fine tune dial turning. The up-down control signal is an up or down signal input to up-down pulse counting to BCD output circuits as determined by phase relation thereof to the step count signal and with the phase determined by direction of fine tune dial turning clockwise for up count and counterclockwise for down count. The up-down counters to BCD are in a chain circuit with carry over circuitry for up-down count transition from one digit location to another that in some equipments is paralleled by supplemental band switching circuits. The BCD outputs of the up-down counter chain circuits are applied to a frequency synthesizer circuit and to readout display device circuits.
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Microwave Electromagnetic Surveillance Receiver System-WJ 1007 Manuals-3, by Watkins-Johnson Co., Dec. 1968, Palo Alto, Calif.
Greenberg Howard R.
Hamann H. Fredrick
Heyman John S.
Rockwell International Corporation
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