Cellular telephone operable on different cellular telephone syst

Details Cellular telephone operable on different cellular telephone syst Cellular telephone operable on different cellular telephone syst

1989-12-20

1991-05-28

Ng, Jin F.

Telephonic communications

Having light wave or ultrasonic link for speech or paging...

Including fiber optic link within telephone network

379 63, 455 77, H04M 1100, H04B 140

Patent

active

050200933

ABSTRACT:
A unique dual-system cellular telephone includes a transceiver (100) having a dual bandwidth receiver, an audio/logic unit (200) having dual control programs, and a handset unit (300). The dual bandwidth receiver of the transceiver (100) has different filters (408 and 410) in the intermediate frequency section thereof which are switchably selected depending on which cellular telephone system is available. When service is not available in one of the cellular telephone systems, the unique cellular telephone automatically switches the receiver bandwidth and control program for operating on the other cellular telephone system.

REFERENCES:
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patent: B14268915 (1985-12-01), Pamet
patent: 4670905 (1987-06-01), Sanovos et al.
patent: 4742560 (1988-05-01), Arai
patent: 4748655 (1988-03-01), Thrower
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patent: 4775999 (1988-10-01), Williams
patent: 4803679 (1989-02-01), Shimizu
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patent: 4833701 (1989-05-01), Comroe et al.
patent: 4833702 (1989-05-01), Shitara et al.
Hewlett Packard Operating Manual No. 8901A entitled "Modulation Analyzer" Mar. 1980.
Collins Radio Company Instruction Book No. 75A-3, entitled "Amateur-Band Receiver", Jun. 1, 1953.
Motorola Brochure No. RB-10-16 entitled Dynatac 6000X Universal Mobile Telephone 1984.

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