A.F.C. system for broad-band FM receiver

Details A.F.C. system for broad-band FM receiver A.F.C. system for broad-band FM receiver

1986-09-18

1987-11-24

Griffin, Robert L.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency or phase modulation

455182, 455183, 455195, 455260, 455265, H04B 116

Patent

active

047094060

ABSTRACT:
An A.F.C. control system for reception of wide-band F.M. transmission such as satellite transmissions, in which a center frequency of an F.M. I.F. signal is repetitively and alternately compared with an upper and a lower frequency limit value so long as the center frequency lies between these values, with the results of the comparisons being respectively stored in two latch memories, whose contents thereby indicate any error of the center frequency relative to the frequency limits. Any departure of the center frequency from between the limits is corrected by successive frequency shifts of the local oscillator frequency, with the results of correction being indicated by the latch memory contents and with the number of frequency shifts being determined accordingly.

REFERENCES:
patent: 4348772 (1982-09-01), Leland et al.
patent: 4380826 (1983-04-01), Usugi
patent: 4392254 (1983-07-01), Ecklund
patent: 4476584 (1984-10-01), Dages
patent: 4598422 (1986-07-01), Fellman

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