Temperature compensated trap filter

Details Temperature compensated trap filter Temperature compensated trap filter

1989-05-19

1990-07-03

Tarcza, Thomas H.

Cryptography

Cryptanalysis

380 10, H04K 300

Patent

active

049397796

ABSTRACT:
A temperature stable television signal trap filter device is easily produced in a wide range of temperature compensating values using commercially available components for securing pay television systems. The trap filter has a series pole and a shunt pole capacitively coupled to the series pole. A first parallel capacitor circuit having a total capacitance and a total temperature compensating value forms a capacitive part of the series pole and a second parallel capacitor circuit forms a part of the shunt pole. Both the first and second parallel capacitor circuit include a first standard capacitor having a first standard temperature compensating value coupled in series with a first branch of the parallel capacitor circuit and a second standard capacitor having a second standard temperature compensating value coupled in series with a second branch of the parallel capacitor circuit. The first and second standard capacitors provide an exact desired total temperature compensating value for the parallel capacitor circuit to pass a desired frequency band in the outdoor use of the trap filter.

REFERENCES:
patent: 3061767 (1959-12-01), Toro
patent: 3989887 (1976-11-01), Murphy
patent: 4085011 (1978-04-01), Juergens et al.
patent: 4097894 (1978-06-01), Tanner et al.
patent: 4268860 (1981-05-01), Blonder
patent: 4581795 (1986-04-01), Mobbs et al.
patent: 4748667 (1988-05-01), Farmer et al.
patent: 4825468 (1989-04-01), Ellis
patent: 4837820 (1989-06-01), Bellavia, Jr.

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