Method of operating a radio

Details Method of operating a radio Method of operating a radio

1994-04-14

1996-02-20

Pham, Chi H.

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

455229, 455302, 455317, H04B 116

Patent

active

054937167

ABSTRACT:
A radio (100), powered by a battery (170), can be used in remote meter reading applications. In order to conserve battery power, the radio (100) is capable of determining that a signal is an image signal rather than a signal on the desired frequency. This is accomplished by attempting to receive a signal utilizing different local oscillator signals (high side injection and low side injection). If a signal is present, as indicated by the received signal strength with both local oscillator signals, then the radio (100) will attempt to decode data. The radio (100) does not attempt to decode data when the signal is determined to be a spurious signal. The radio (100) can then be operated in a reduced power consumption mode. This results in battery savings for radios operating in the presence of an image frequency signal.

REFERENCES:
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patent: 4395777 (1983-07-01), Oki et al.
patent: 4512035 (1985-04-01), Victor et al.
patent: 4551856 (1985-11-01), Victor et al.

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