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These connectors are for CATV trunk and feeder lines. They are a special ceramic that expands while heated, and grip the outer aluminum so tight that it will break before it sucks out during a sudden temperature drop. They are installed with an open flame from a propane torch. You tighten the connector to the housing, prep the hardline and slip into the connector as soon as it is hot enough. After it cools, you tighten the center conductor. They are very RF tight, and have a very small insertion loss, or much of an impedance bump. I believe the ones we used were from Raychem, which specialized in Aircraft and Military connectors.


Michael A. Terrell