FM RF signal generator using step recovery diode
First Claim
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1. 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.
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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.
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Citations
9 Claims
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1. In a signal generator for generating frequency modulated RF signals available for testing key parameters of FM receivers the combination comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification