Channel signal detection circuit for scanning receivers

Details Channel signal detection circuit for scanning receivers Channel signal detection circuit for scanning receivers

1979-07-20

1981-08-04

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

H03J 718

Patent

active

042826020

ABSTRACT:
An on channel signal detection system for use in scanning receivers to stop scanning at the desired frequency rather than for an undesired frequency. An amplifier receives IF signal and supplies them to a limiter composed of a pair of diodes. The output of the diodes is supplied to a tank circuit having a sufficiently high Q to provide at least some attenuation. The output of the tank circuit causes a transistor to go into conduction to cause a scanning controller to interrupt the scanning mode in the case of a on channel signal only.

REFERENCES:
patent: 3231686 (1966-01-01), Hueber
patent: 3633111 (1972-01-01), Smith
Service Manual for Motorola Model #1CH3507, 1974.

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