Television frequency converter with automatic gain control and output

Abstract

A system for wireless connection of a television signal source such as a video cassette player to a standard television receiver within a home. A local television signal is modulated on a nonstandard carrier frequency different form the standard carrier frequencies utilized for conventional broadcast television. The nonstandard broadcast signal is unintelligible to a standard television receiver. Because a nonstandard broadcast signal is employed, the television signal cannot be received by standard television receivers in neighboring homes. A converter unit at the remote location adjacent the television receiver receives the nonstandard signal, amplifies the received signal, mixes the received signal with a local oscillator signal to convert the nonstandard signal to an output signal on a standard television channel carrier frequency at an output terminal connected to the antenna input of a television set. An automatic gain control device controls the amplification of the received signal by monitoring the amplitude of the output signal. The automatic gain control device is isolated from externally applied signals appearing at the output terminal.