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4.2
While VSWR is an indicator to express the efficiency of the antenna's energy
transmission, DTF is a measurement to identify the fault locations in the
antenna line system. Most of the antenna line system consists of the various
types of coaxial cables, connectors and devices such as dividers and surge
arrestors. Since VSWR is a measurement to verify the impedance
discontinuity of the total feed line system, it is necessary to perform DTF
measurement to identify the exact component that is contributing to the
performance of the line system. The DTF measurement makes it easy to
identify the fault location by displaying the relative distance of the signal
reflections or discontinuities from various points of the line system
4.2.1
DTF Display Description
The screen shown in Figure 4.6 is displayed when DTF measurement mode
is selected. The distance from the instrument is shown on the X-axis, while
Figure 4.5 Limit Line Application
DTF
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