3-20 PN: 10580-00321 Rev. M S331L UG
3-4 Line Sweep Measurements Cable and Antenna Measurements
Example 2 – DTF Transmission Line Test
The Distance-To-Fault transmission line test verifies the performance
of the transmission line assembly and its components and identifies the
fault locations in the transmission line system. This test determines the
return loss value of each connector pair, cable component and cable to
identify the problem location. This test can be performed in the
DTF-Return Loss or DTF-VSWR mode. Typically, for field applications,
the DTF-Return Loss mode is used. Figure 3-15 on page 3-21 shows the
failure with the antenna still attached.
To perform this test, disconnect the antenna and connect the load at the
end of the transmission line (Figure 3-16 on page 3-21).
Figure 3-14. DTF Return Loss with a Short at the End of the Cable
(20.5 m)
Note
In Figure 3-14, M1 and M2 are jumper cable connections. The
peak beyond the end of the cable at M3 is the return reflection
of the M2 peak.
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