AFC circuit for direct modulation FM data receivers
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United States of America Patent
Stats
-
Jun 9, 1987
Grant Date -
N/A
app pub date -
Apr 30, 1985
filing date -
Apr 30, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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