Figure 5-19 Cable Loss Plot For A 17 Meter Cable With No Odu - Motorola PTP 800 User Manual

Testing the installation
Cable loss example using a 17 meter cable
This example is for a cable run consisting of the following:
x
0.7m cable from the test equipment to the first LPU.
x
The first LPU.
x
17m of cable between the two LPUs (length 'y' in
x
The second (mast mounted) LPU.
x
0.7m of cable from the LPU to ODU.
When performing
plots of cable loss:
x
Figure 5-19
plot shows an average cable loss of 1.96 dB. This can be compared with the
expected result in
0.7m + 0.7m) with two LPUs, the table result is 1.9 dB, which is within the
expected tolerance of +/- 10%.
x
Figure 5-20

Figure 5-19 Cable loss plot for a 17 meter cable with no ODU

5-80
Procedure 5-15 steps 4 to 6, compare the 'before' and 'after'
is a plot of cable loss taken before the ODU was connected. The
Table 5-5. For a cable length of approximately 19m (17m +
is a plot of cable loss taken after the ODU was connected.
Chapter 5 Installation
Figure 5-18).
phn-1478_005v000
Apr 2010