Testing Cable Loss - Motorola PTP 800 User Manual

User Guide: PTP 800 Licensed Ethernet Microwave

Testing cable loss

The purpose of this test is to ensure that the total cable loss is within acceptable
limits.
Before performing this test, ensure that the test equipment is set up as described in
Test preparation
To measure cable loss, proceed as follows:
Procedure 5-15 Cable loss measurement
Select the 'cable loss-one port' mode of the cable analyzer
1
(Figure
Set the frequency of measurement to:
2
F1 = 350MHz
F2 = 400MHz.
3 Calibrate the instrument for the selected frequencies, using the
correct calibration kit.
4 Before connecting the ODU, obtain a plot of cable loss and
check that it is within the expected limits for the given cable
length
(Figure 5-19
5 Connect the ODU.
6 Observe the effect of the ODU connection on the plot of cable
loss.
Compare it to examples of good installations
Figure
If there is little or no change to the plot when the ODU is
connected, it indicates a short or open circuit on the cable.
7 Keep a copy of the cable loss plots so that they can be
compared with subsequent plots to determine if there is any
degradation with time.
phn-1478_005v000
Apr 2010
on page 5-78.
5-17).
(Table 5-5). Compare it to examples of good installations
and Figure 5-21).
5-22).
Testing the installation
(Figure 5-20 and
5-79