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The FDR measurement technique requires a swept frequency input to the transmission line.

Poorly tightened connectors and poor environmental seals are exacerbated by acid rain corrosion.

A TDR cannot detect small performance changes at RF frequencies, so it is not possible to monitor performance degradation between maintenance intervals with these traditional methods.

Without FDR techniques, the “Fix after Failure” philosophy becomes the only alternative.

This practice may be precipitated by the cable installer, who would likely make the same mistakes on each cable connection.

Replacing all the cables frequently is an expensive proposition.

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