Abstract: A circuit for transmitting a jamming signal for disruption of a television signal transmitted along a cable or other guided path toward a television receiver, the circuit having a first oscillator means providing an audio frequency signal which is used to frequency modulate a second oscillator means between the signal video and audio carrier frequencies inclusively and having a third oscillator means providing square-wave horizontal-sweep-frequency signal which is used with an amplitude-modulating means for amplitude-modulating the output of the second oscillator means to produce a jamming signal for directional coupling into the guided path for the purpose disrupting both audio and video content of the television signal.