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Abstract

An improved hybrid electronic radio repeater comprising an antenna means for receiving a select, narrow frequency band of radio wave signals, the radio wave signal(s) being transmitted from discrete sources wherein the radio wave signals contain source, status and control information. A radio frequency amplifier means filters and amplifies the radio signals and passes them to a mixing means. The mixing means, including a local oscillator means, combines the radio frequency signals with the local oscillator signals to produce intermediate frequency signals. The intermediate frequency signals are narrow filtered causing tuning by local oscillator tuning means. An intermediate frequency amplifier means detects and amplifies the IF signals and generates a signal strength level indication in response thereto. A control means, the control means being an intelligent unit capable of discerning information and generating responses thereto, monitors the signal strength level indications and also initiates the tuning voltage level of said narrow frequency band local oscillator tuning, for the presence of select radio wave signals, the control means tuning the hybrid radio repeater in response to the presence of the select signals.

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First Claim