Automatic frequency control system for single sideband...

Details Automatic frequency control system for single sideband... Automatic frequency control system for single sideband...

H - Electricity

03

D

325/83

H03D 7/00 (2006.01) H03D 1/24 (2006.01) H03J 7/04 (2006.01) H04B 1/30 (2006.01)

Patent

CA 1131710

SO1008 S78P34 AUTOMATIC FREQUENCY CONTROL SYSTEM FOR SINGLE SIDEBAND SIGNAL RECEIVER ABSTRACT OF THE DISCLOSURE A single sideband receiver having a demodulator or mizer for carrier frequency demodulation in response to the output of a controllable variable frequency oscillator and an intermediate frequency demodulator for providing a demodulated signal is provided with an automatic frequency control system comprising a low pass filter for separating a low frequency portion from the demodulated signal a discriminator for detecting the level of the low frequency portion with respect to a predetermined level, and a circuit for-controlling the frequency of the variable frequency oscillator in response to the detected relationship between the low frequency portion and the predetermined level. -1-

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