Atec Kaelus-RTF Series - Manual (Page 2)

With a second button push, the operator can switch to “RL” view to
see Return Loss vs. distance. As with the PIM view, a marker function
is provided to display the magnitude and distance of each Return Loss
peak.
RETURN LOSS VS. DISTANCE
“OVL” view overlays Return Loss vs. distance and PIM vs. distance
on a single screen. The user can independently set markers for both
PIM peaks and Return Loss peaks and measure the relative distance
between faults. Electrically long devices such as filters or TMAs, and
changes in velocity factor caused by jumper cables vs. feeders can
reduce the absolute accuracy of individual distance calculations. Since
these errors impact both the PIM and Return Loss calculations equally,
the relative distance between faults is typically more accurate than the
individual distance calculations. Using the relative distance of a PIM
problem to a known Return Loss peak allows users to locate faults on
the line with more precision than with PIM vs. distance alone.
PIM & RETURN LOSS OVERLAY
With a single button push, the operator can switch to “PIM” view to see
the relative magnitude of all PIM sources on the line. A marker function
is provided allowing the user to jump from peak to peak displaying the
magnitude and distance to each PIM fault. Kaelus’ RTF solution utilizes
proprietary enhanced resolution algorithms that enable the user to
resolve closely spaced PIM faults that a standard FFT analysis can not
see.
With an RTF Module attached the iQA user software provides four
different views the operator can use to analyze PIM faults at the cell
site. The “Basic” view clearly identifies the distance and magnitude
of the largest static PIM fault on the line. For fastest results, Kaelus
recommends methodically eliminating the largest PIM fault and
repeating until all static PIM sources have been removed. Once the
static PIM sources are removed, the operator can proceed to dynamic
PIM testing to certify that the PIM performance is stable and robust.
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RTF ANALYSIS |
PIM VS. DISTANCE
DISTANCE TO LARGEST PIM SOURCE
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