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User Guide: PTP 800 Licensed Ethernet Microwave
DTF return loss example
This example shows typical DTF return loss in a good installation. The distances
from the test equipment to first LPU (marker M2), and then the second LPU
(marker M3) are clearly shown. The cable between them shows no discontinuity.
There are two plots:
x
Figure 5-23
peak (marker M1) is the position of the cable open circuit.
x
Figure 5-24
peak remains in the same position but is now reduced in amplitude because
less signal is reflected, as a consequence of the better match of the ODU.
Figure 5-23 DTF plot for a 17 meter cable with no ODU
0
-10
-20
-30
-40
-50
-60
0.0
Resolution: 517
Std: ---
Date: 11/10/2009
Model: S311D
phn-1478_005v000
Apr 2010
is a plot of DTF return loss before the ODU is connected. The final
is a plot of DTF return loss after the ODU is connected. The final
M1: -5.03 dB @ 18.56 m
M 2
2.5
5.0
7.5
Distance-to-fault
LPU+17M
M2: -13.11 dB @ .63 m
10.0
12.5
15.0
Distance (0.0 - 25.0 M eter)
CAL:ON(COAX)
Channel: N/A
Time: 04:49:26
Serial #: 00936036
Testing the installation
M3: -17.41 dB @ 17.83 m
M 3
M 1
17.5
20.0
22.5
CW: OFF
Ins.Loss:0.135dB/m
Prop.Vel:0.850
25.0
5-85
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