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For the majority of transmission lines and antennas, the absence of DTF capability severely impacts the time to repair transmission lines and renders preventative maintenance procedures impractical.RF failure conditions at the top of a tower or through a bulkhead frequently are not measurable with traditional tools such as TDR and spectrum analyzers with tracking generators.The FDR measurement technique requires a swept frequency input to the transmission line.An inverse FFT (Fast Fourier Transform) is performed on the reflected signals transforming this information into the time domain.In a Wireless Communication System, tower mounted transmission lines and cables are replaced frequently, perhaps every five to ten years, in some cases.Usually, all the site’s cables are replaced based upon the assumption that maintenance calls are imminent on other feeds in addition to the problem cable.These common problems can cause unwanted signal reflections.
DTF finds these problems because the FDR technique can accurately detect very small performance changes within the transmission line.
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.
The FDR technique uses a swept RF signal instead of TDR DC pulses.
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 distance is then calculated from this information by knowing the propagation velocity.