PIM Site Analyzer
α
Manual
© Rosenberger 2017 -
www.rosenberger.com/pia
Page 29 of 54
6.5.2 Zeroing Return Loss
Return Loss is zeroed without a load / adaptor at the end of the cable. In the DTF settings menu “Return
Loss Location” has to be checked in the DTF settings screen. Also make sure that “Output Power RL” is set
to 23 dBm.
After successful zeroing “PASS” is displayed and with that the zero-point is set. To avoid mistakes in the
following measurements please uncheck the “Enable” checkbox in the DTF settings screen. With that the
“Zero RL” button on the measurement screen disappears.
6.5.3 Setting the velocity factor of the signal path
In order to get an increased accuracy for distance measurements, the velocity factor of the signal path can
be set up in sections. Enter the cable length and select a predefined cable from the table (or a custom de-
fined factor) and hit “Add new cable” to create a list of subsequent cable sections from the zero point to the
“end” of possible PIM occurrences.
The given example includes a 4 m jumper (1/2” R) and a 33 m feeder (7/8” R) + 2 m jumper (1/2” R) all be-
yond the last entry is treated as “Air” with 100% because the antenna is almost unknown anyway.
