Apparatus for collecting and processing messages transmitted at

Details Apparatus for collecting and processing messages transmitted at Apparatus for collecting and processing messages transmitted at

1981-11-05

1984-10-23

Bookbinder, Marc E.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency or phase modulation

329122, 455226, 455260, H04B 116

Patent

active

044792492

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.

REFERENCES:
patent: 3614627 (1971-10-01), Runyan et al.

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