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

H - Electricity

04

B

325/106, 325/87

H04B 1/26 (2006.01) H03J 7/06 (2006.01)

Patent

CA 1259378

A.F.C. System For Broad-Band FM Receiver ABSTRACT OF THE DISCLOSURE 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.

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