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This dual role of predicting future failure conditions and isolating existing problems makes DTF an important part of service and maintenance on transmission lines.DTF displays RF return loss or VSWR data versus distance.It is much less expensive to monitor individual transmission lines for slight degradation and fix the problem early, before serious damage occurs. Transmitter performance is optimized by eliminating poorly performing components. Hand off anomalies are reduced by eliminating ping-ponging between weak/strong base stations.Preventative maintenance has another set of benefits even more important than cost. Overall quality is improved giving greater customer satisfaction.
An inverse FFT (Fast Fourier Transform) is performed on the reflected signals transforming this information into the time domain.
Thus, the actual return loss versus distance is shown in Figure 1. Distance TEST TIP Cable manufacturers specify the propagation velocity (Vp) of cables.
Anritsu Handheld products incorporating DTF include tables of many standard cables and waveguides to simplify DTF measurements. If this specification is not available, it can easily be determined by measuring a known length of cable.
These common problems can cause unwanted signal reflections.
Poorly tightened connectors and poor environmental seals are exacerbated by acid rain corrosion.