Mobile radio range extender with saw filter

Details Mobile radio range extender with saw filter Mobile radio range extender with saw filter

1985-06-17

1987-03-31

Ng:, Jin

Telecommunications

Receiver or analog modulated signal frequency converter

Squelch

455223, 455315, 455307, H04B 110

Patent

active

046548858

ABSTRACT:
A mobile radio receiver employs an SAW filter to provide an appropriate time delay to enable an extender to effectively blank the recovered signal thereby preventing noise from entering the IF section of the radio. The SAW filter allows long signal delays without significant pulse stretching while also allowing narrow IF bandwidths. The control pulse to the blanker switch is shaped to reduce the coupling of noise generated within the blanker switch from the received signal path. The operation of the extender is controlled by the main receiver through an AGC signal to determine when, and to what extent, the extender is enabled.

REFERENCES:
patent: 3191124 (1965-06-01), Brown
patent: 3304503 (1967-02-01), Walker, Jr.
patent: 3339144 (1967-08-01), Squires
patent: 3366884 (1968-01-01), Kurusu
patent: 3699457 (1982-10-01), Wright
patent: 3725674 (1973-04-01), Schaeffer et al.
patent: 4314377 (1982-02-01), Kondo et al.
patent: 4334317 (1982-06-01), Beesley
patent: 4510624 (1985-04-01), Thompson et al.
patent: 4525867 (1985-06-01), Shiratani
patent: 5521917 (1985-05-01), Holt
Case History of a Surface-Wave TV IF Filter for Color Television Receivers, Devries et al., Proceedings of the IEEE, vol. 64, No. 5, May 1976, pp. 671-676.

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