Locked-oscillator repeater with modulation frequency feedback

Claim 1

A radio frequency repeater comprising receiving means for receiving an incoming signal; frequency reduction means, electrically in series with said receiving means, for reducing the frequency of a received incoming signal; a free running injection locked oscillator into which said reduced frequency incoming signal is injected, said oscillator producing an output signal and having a tank circuit containing a voltage controlled reactance which determines the frequency of said injection locked oscillator; sampling means, electrically coupled to the said injection locked oscillator, for sampling the output signal of said oscillator; processor means, electrically coupled to said sampling means, for converting the sampled oscillator output to a control voltage, the magnitude of said control voltage being dependent upon the frequency of the sampled oscillator output, and applying said control voltage to the voltage controlled reactance in the tank circuit of the injection locked oscillator thereby causing the free running frequency of said oscillator to follow the frequency of the incoming signal; frequency increasing means, electrically coupled to the output of said injection locked oscillator, for increasing the frequency of the injection locked oscillator output to a desired transmission frequency; transmitting means, electrically coupled to the output of said frequency increasing means, for transmitting an outgoing signal; and isolation and coupling means for coupling the reduced frequency incoming signal to the injection locked oscillator and for coupling the output signal from the injection locked oscillator to the processor means and frequency increasing means.