Dtf sites

FDR is a transmission line fault isolation method which precisely identifies signal path degradation for coax and waveguide transmission lines.Although the acronyms are similar, FDR technology is different from traditional Time Domain Reflectometry (TDR) techniques.Sunlight exposure can change the dielectric properties of the antenna housing, causing the antenna bandwidth to drift.Antennas and transmission lines used on-board ships and aircraft may be degraded due to salt water corrosion.

FDR is far more sensitive than TDR and can precisely locate faults and degradation in system performance, not just DC open or short circuit conditions.Many components can cause problems in a communication system.Transmission lines are typically the most common failure point.The effects of poor connections, damaged cables, or faulty antennas are quickly identified.Since DTF automatically accounts for attenuation versus distance, the display accurately indicates the return loss or VSWR of the antenna.These common problems can cause unwanted signal reflections.Poorly tightened connectors and poor environmental seals are exacerbated by acid rain corrosion.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.For example, connector corrosion can be detected early and weather seals replaced before moisture destroys expensive cables.DTF finds these problems because the FDR technique can accurately detect very small performance changes within the transmission line.

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