Swept frequency trap jammer for secure television system

Details Swept frequency trap jammer for secure television system Swept frequency trap jammer for secure television system

1975-08-28

1976-11-02

Wilbur, Maynard R.

Telegraphy

Systems

Simplex-reversing periodic

325132, 325477, H04N 144

Patent

active

039898873

ABSTRACT:
A jamming circuit for making unusable the television signal of a preselected channel includes a bridged T-trap filter having a pair of high Q circuits adapted to be tuned to the carrier frequency of the preselected channel, and a device for cyclically sweeping each tunable circuit through the video carrier frequency for the preselected channel. Each circuit is varied approximately .+-. 500 KHz from the carrier frequency, the cyclic sweeping rate being 14 KHz for one tunable circuit and 16 KHz for the other. Cyclic tuning is achieved by using varactors as part of the tuning capacity for each circuit, the varactors receiving a sawtooth waveform produced by two free-running oscillators. As a result of the jamming circuit, the television signal is modulated at a 14 KHz, 16 KHz and 2 KHz rate, thereby producing severe amplitude and phase distortion.

REFERENCES:
patent: 3859457 (1975-01-01), Kirk, Jr.
patent: 3898375 (1975-08-01), Hannan et al.

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