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US 4,013,966 AGranted
FM RF signal generator using step recovery diode
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorKenneth J. Campbell
Life of this patent
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Abstract
A step recovery diode pulse generator is driven by a fixed frequency oscitor to provide pulses which are modulated in a balanced modulator by means of a voltage controlled oscillator controlled by a variable frequency input. The output of the balanced modulator is attenuated and provides a frequency modulated RF signal output.
Claims9
In a signal generator for generating frequency modulated RF signals available for testing key parameters of FM receivers the combination comprising:
- a. signal generating means for generating an output signal of a predetermined frequency;
- b. pulse generating means coupled to said signal generating means for generating narrow output pulses at said predetermined frequency;
- c. modulator circuit means coupled to said pulse generating means;
- d. variable frequency signal means coupled to said modulator circuit means for frequency modulating said narrow pulses to provide a plurality of frequency modulated RF signals at the output of said modulator circuit means.
1 more element
Dependencies are inferred from the claim text.