Radio telephone system

Details Radio telephone system Radio telephone system

1988-07-08

1990-07-03

Lev, Robert

Telephonic communications

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

Including fiber optic link within telephone network

379 61, H01Q 704

Patent

active

049397664

ABSTRACT:
A radio telephone system comprises a base unit electrically connected to a wire telephone line and at least one radio telephone set which can be connected to the base unit through a radio communication line. A predetermined threshold value is normally set for the intensity of a received electric field generated in the radio line so that, when the received electric field intensity does not reach the threshold value, for example when the radio telephone set is separated by more than a predetermined distance from the base unit, the radio communication line is automatically cut off. In the radio telephone system, the threshold value for the received electric field intensity can be arbitrarily modified by means of a suitable operating member disposed in the radio telephone set to thereby increase the flexibility of the radio telephone system. The operating member can comprise, of course, an exclusive key switch, a pushbutton switch or the like, or alternatively a dial key or the like previously provided in the radio telephone set may be commonly used also as the operating member.

REFERENCES:
patent: 4023723 (1977-06-01), Memdoza
patent: 4593273 (1986-06-01), Narcisse
patent: 4761806 (1988-08-01), Toki
patent: 4775995 (1988-10-01), Chapman et al.
patent: 4802201 (1989-01-01), Yoshizawa et al.

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