Mobile radiotelephone apparatus and method

Details Mobile radiotelephone apparatus and method Mobile radiotelephone apparatus and method

1976-09-13

1978-07-25

Claffy, Kathleen H.

H04Q 704, H04B 726

Patent

active

041031067

ABSTRACT:
Mobile radiotelephone apparatus including channel finding means for locating an available channel for placing a call from the mobile unit. The channel finding means may have means for cyclically reducing one of the input voltages received by the supervisory logic means of the mobile radiotelephone, thereby periodically initiating an effort to seize an available channel. The channel finding means may have audible or visual channel available signaling means to indicate that the radiotelephone has seized an available channel.

REFERENCES:
patent: 2803744 (1957-08-01), Berger
patent: 3173996 (1965-03-01), Rypinski
patent: 3351714 (1967-11-01), Kunzelman
patent: 3513264 (1970-05-01), Baer
patent: 3555424 (1971-01-01), Malm
patent: 3634627 (1972-01-01), Valentini
patent: 3764915 (1973-10-01), Cox
patent: 3806804 (1974-04-01), Mills
patent: 3894194 (1975-07-01), Frost

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