Radio receiver

Details Radio receiver Radio receiver

1985-02-27

1987-06-09

Griffin, Robert L.

Pulse or digital communications

Spread spectrum

Direct sequence

375 39, 375 81, 375 97, 329124, 455265, H03D 122

Patent

active

046726403

ABSTRACT:
A radio pager for receiving FSK signals has optimally narrow gaussian bandpass filters (F1, F2) and a phase lock loop (11, 12, 13, 14) for preventing local oscillator drift controlled in dependence of the derivation frequency (.+-.4.5 KHz) which is accurately controlled at the transmitter and which is derived from the decoder logic circuit (20).
A significant increase in sensitivity is achieved over existing pagers.

REFERENCES:
patent: 3456196 (1969-07-01), Schneider
patent: 4193033 (1980-03-01), Voorman
patent: 4193034 (1980-03-01), Vance

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