Apparatus for collecting and processing messages transmitted at different signal frequencies
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United States of America Patent
Stats
-
Oct 23, 1984
Issued Date -
N/A
app pub date -
Nov 5, 1981
filing date -
May 12, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus for receiving messages transmitted from a plurality of radio signal sources operating at different frequencies within a predetermined frequency band. Means are provided to frequency scan the receive signals, deriving information for determining the frequency range in which said signals lie. A demodulating phase locked loop is connected to receive the radio frequency signals, and an initial operating frequency for the phase locked loop is provided by the frequency range information determined from the means for frequency scanning. A resetting circuit is included to maintain the phase locked loop oscillator frequency at a value independent of the frequency of the radio signals.
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