AFC circuit for direct modulation FM data receivers

Details AFC circuit for direct modulation FM data receivers AFC circuit for direct modulation FM data receivers

1985-04-30

1987-06-09

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 97, 329122, 455208, 455258, H04L 2714

Patent

active

046726365

ABSTRACT:
An FM data receiver of the offset type, in which the local oscillator frequency is located between the two frequency-shift-keyed signalling frequencies. To counter the effects of drift in the local oscillator, a simple AFC system mixes the signalling tone signals with delayed signals to provide a frequency control signal.

REFERENCES:
patent: 4426735 (1984-01-01), Kasperkovitz
patent: 4509205 (1985-04-01), Kasperkovitz
patent: 4523324 (1985-06-01), Marshall
patent: 4547902 (1985-10-01), Kasperkovitz

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