Portable radio apparatus having battery saved channel scanning f

Details Portable radio apparatus having battery saved channel scanning f Portable radio apparatus having battery saved channel scanning f

1988-02-19

1990-12-11

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455127, 455166, 455343, H04B 104, H04B 116

Patent

active

049776118

ABSTRACT:
A portable radio apparatus may operate in a battery saving mode on any one of a plurality of channels, in order to communicate with a central office. The apparatus selects a channel for its use on a basis of the strength of the electrical fields on the various channels. During an initial period the apparatus scans continuously for a channel. If no channel is found during the initial period, the apparatus switches to an intermittent scan, with power down between the intermittent scan, thus providing the battery saving mode.

REFERENCES:
patent: 3962553 (1976-06-01), Linder et al.
patent: 4181893 (1980-01-01), Ehmke
patent: 4384361 (1983-05-01), Masaki
patent: 4419765 (1983-12-01), Wycoff et al.
patent: 4457018 (1984-06-01), Takayama
patent: 4631496 (1986-12-01), Borras et al.
patent: 4794649 (1988-12-01), Fujiwara

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