Automatic frequency control system

Details Automatic frequency control system Automatic frequency control system

1978-11-14

1980-12-23

Bookbinder, Marc E.

Telecommunications

Receiver or analog modulated signal frequency converter

Carrier and single sideband

455263, H04B 126

Patent

active

042414520

ABSTRACT:
Automatic frequency control (afc) particularly for single sideband (SSB) receiving systems.
In a SSB receiving system, 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 waveform comprises the pilot carrier interspersed 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.

REFERENCES:
patent: 2494751 (1950-01-01), Forster
patent: 2730614 (1956-01-01), Wheeler
patent: 2915626 (1959-12-01), Freedman
patent: 3084328 (1963-04-01), Groeneveld et al.

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