Desired Specifications Of Pay Cable Traps (1976)

By Dan Pike, United Cable Television Corporation

A list of desired specifications is developed, with a discussion of each, for a trap on channel A (121.25 MHz). The specifications are intended to describe a filter whose performance will be predictable over a wide range of environments and with many different TV receivers. Also discussed are the differences to be expected in operating parameters of filters for channels higher and lower than channel· A.

Considerations discussed are: the critical portions of the signal to be trapped, the parameters needed to effect scrambling action in the receiver, specifications geared to insure time stability, and specifications intended to cause poor to indiscernible audio in most receivers.

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