Method and apparatus for jamming cable television channels

Abstract From the Canadian patent

Frequency control of multiple oscillators using a single frequency locked loop is accomplished by a single frequency-control device that is timeshared with a plurality of voltage-controlled oscillators and selectively establishes a "desired" frequency for each oscillator. The output of each oscillator is, in turn, selectively routed to a frequency counter which measures the "actual" frequency of the oscillator. A comparison between the desired frequency and the actual measured frequency for each oscillator is made, and an error voltage developed. This error voltage is routed to the appropriate capacitor, which stores the voltage required to keep the selected oscillator on frequency until …