Radio selective call receiver capable of adjusting radio signal

Details Radio selective call receiver capable of adjusting radio signal Radio selective call receiver capable of adjusting radio signal

1997-02-24

1999-08-10

Vo, Nguyen

Telecommunications

Transmitter and receiver at separate stations

Plural transmitters or receivers

4552491, 4552501, 455254, H04B 726, H04B 110

Patent

active

059373563

ABSTRACT:
In a radio selective call receiver for lowering a radio signal level in accordance with the state where reception of a sync signal is enabled/disabled, an amplifier 53 amplifies a radio signal fed from a base station. A frequency converter 54 shifts a frequency of the radio signal amplified in the amplifier 53 to a first frequency band and a second frequency band. A demodulator 55 converts a radio signal shifted to the second frequency band by the frequency converter 54 into a base band signal. A level detector 56 outputs a direct current voltage relative to an electric field intensity level of the radio signal shifted to the second frequency band by the frequency converter 54. A comparator 57 compares the direct current voltage output from the level detector 56 with a predetermined voltage. A controller 42 judges whether a first sync signal can be received by a base band signal demodulated by the demodulator 55, and outputs a control signal "L" to an attenuation circuit 52 when determined that reception of the first sync signal is impossible. The attenuation circuit 52 lowers the level of the radio signal by the control signal "L" output from the controller 42.

REFERENCES:
patent: 5369799 (1994-11-01), Tsunoda
patent: 5448774 (1995-09-01), Yokozaki et al.

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