Automatic frequency control system

Details Automatic frequency control system Automatic frequency control system

H - Electricity

03

L

325/82

H03L 7/00 (2006.01) H03J 7/04 (2006.01) H04B 1/30 (2006.01)

Patent

CA 1141826

PHB 32,599 ABSTRACT: Automatic frequency control system particularly for single sideband receivers, wherein fine tuning is carried out using an afc loop. In one embodiment, the loop includes a frequency discriminator for measuring the frequency of a composite i.f. signal (pilot carrier and modulating signal) and producing a waveform having an amplitude corresponding to the measured frequency. The amplitude wavefore comprises the pilot carrier inter- spersed by the modulating signal. The frequency of the pilot carrier is measured using a peak detecting circuit and this measurement is used to automatically fine tune the receiver.

315468

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