Secured scramble decoder filter

Details Secured scramble decoder filter Secured scramble decoder filter

1976-11-01

1978-06-27

Buczinski, S. C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

200 6108, 339 37, 358114, 361399, 361422, H04N 144, H01H 3542, H01R 1344

Patent

active

040978940

ABSTRACT:
A secured scramble decoder filter comprised of a narrow band filter assembled on a fragile substrate and mounted in a housing wich automatically destroys the filter when any tampering is attempted. The filter is a series tuned network bridging a conductor coupled through a capacitor to a parallel tuned network, which is connected to ground. The coils for the filter are printed on a special electronic glass tube for temperature stability while the capacitors are deposited on the fragile substrate. The filter is mounted in a sealed housing in brackets with a spring, loaded to break the substrate when the device is tampered with to render it inoperative. The device is provided with a mounting screw requiring a special tool for removal so that when the device is mounted any prying in an attempt to remove the device will trigger the destruction of the filter.

REFERENCES:
patent: 2702330 (1955-02-01), Levy
patent: 2905747 (1959-09-01), Kidd et al.
patent: 2984768 (1961-05-01), Henry
patent: 3202758 (1965-08-01), Brownstein
patent: 3347982 (1967-10-01), Bass et al.
patent: 3452303 (1969-06-01), Babcock
patent: 3760097 (1973-09-01), Burroughs et al.
patent: 3760130 (1973-09-01), Ross et al.
patent: 3896262 (1975-07-01), Hudspeth et al.

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