Radio receiver for tone modulated signals

Details Radio receiver for tone modulated signals Radio receiver for tone modulated signals

1979-10-19

1981-03-03

Pitts, Harold I.

Pulse or digital communications

Repeaters

Testing

375 88, 375 89, H04B 116

Patent

active

042545030

ABSTRACT:
A radio receiver for frequency modulated (FM) tones. Received signals are split and one split portion of the signal is phase shifted relative to the other and mixed with a local oscillator. The signal as received clocks a flip-flop. The phase shifted signal is fed to the switching input of the flip-flop. The input signal having been modulated with an FM tone which oscillates about the frequency of the local oscillator, the output of the flip-flop is a digital waveform the frequency of which is the same as that of the modulating tone. This digital waveform is applied to a band pass filter accepting the fundamental frequency of the digital wave form from the flip-flop for passage to a detector.

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