Radio jamming device

Details Radio jamming device Radio jamming device

1962-09-28

1980-08-12

Birmiel, Howard A.

Telecommunications

Interference signal transmission

343 18E, H04K 300

Patent

active

042175500

ABSTRACT:
1. A jamming device adapted to jam a given frequency band with the exception of a particular jam-free band included in said given frequency band, comprising a transmitter tube generating a radiofrequency carrier signal, means for blocking said tube, means for frequency-modulating said carrier signal, means connected to said frequency-modulating means for generating a modulation signal having an amplitude versus time waveform including a first saw-tooth and a second saw-tooth, both having two portions in which respectively the amplitude of the modulation signal increases and decreases with respect to time, and a linear portion in which the amplitude of the modulation signal abruptly varies from the amplitude value at the end of the first saw-tooth to the amplitude value at the beginning of second saw-tooth, the variation direction of the modulation signal amplitude on both sides of the linear portion of the waveform being opposite the direction of said variation along said linear portion, means for deriving blocking signals from the passage of the frequency of the frequency-modulated signal through the jam-free band and means for applying said blocking signals to said blocking means.

REFERENCES:
patent: 2885543 (1959-05-01), Williams
patent: 2972119 (1961-02-01), Ford et al.
patent: 3517388 (1970-06-01), Vermillon

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