RF Trap for a cable television trunk amplifier station
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United States of America Patent
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-
Sep 14, 1982
Grant Date -
N/A
app pub date -
Oct 1, 1980
filing date -
Oct 1, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In an amplifier station for a trunk system, switching apparatus responsive to the absence or presence of a control signal selectively passes R. F. signals in a prescribed frequency band on a main transmission line to first and second lines. During normal operation of the amplifier relay coils are energized so as to engage second and third contacts for passing signals on the second line with amplification. When the amplifier is operating properly, PIN diodes short opposite ends of the first line for improving isolation in the station equipment. In the event of amplifier malfunction, first and third contacts are engaged thereby providing transmission along the first line. A tubular conductive member surrounds the switch contacts so as to provide capacitive coupling thereto. The tubular member is capacitively coupled to a ground plane to thereby by-pass signals which are above the desired passband of the trunk system.
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