3-14 PN: 10580-00321 Rev. M S331L UG
3-4 Line Sweep Measurements Cable and Antenna Measurements
If the cable is longer than DMax, the only way to improve the horizontal
range is to reduce the frequency span or to increase the number of data
points. Similarly, the distance resolution is inversely proportional to the
frequency range and the only way to improve the distance resolution is
to widen the frequency span.
Cable List
Selecting the cable type is critical for accurate DTF measurements.
Incorrect propagation velocity values affect the distance accuracy, and
inaccurate cable attenuation values affect the accuracy of the amplitude
values. The Site Master S331L is equipped with a cable list (Freq/Dist >
DTF Setup > Cable List) including most of the common cables currently
used. Once the correct cable has been selected, the instrument will
update the propagation velocity and the cable attenuation values to
correspond with the cable. For setups with several different cable types,
choose the main feeder cable.
For cables not on the list, select NONE and manually enter the
Prop Velocity and Cable Loss in DTF Aid or the DTF Setup submenu.
Figure 3-10. DTF Aid
Note
When determining the frequency range, consider all in-line
frequency selective devices.
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