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Chapter 7 1-Port Cable Loss Testing
64
CellAdvisor JD720C User's Manual
Introducing 1-port cable loss measurements
The 1 Port Cable Loss measurement checks the signal attenuation level of the cable. The
frequency band to measure the characteristics of a cable must be calibrated before
performing the cable loss measurement. This measurement can be especially useful in
measuring the loss of feed line connected to the antenna. By placing a short at the end of the
cable or leaving it open, the signal is reflected back and the energy lost in the cable can be
computed. Cables with larger diameter generally have less insertion loss and better power
handling capabilities than cables with smaller diameter.
Display screen
shows an example of 1 Port Cable Loss measurements.
Figure 33
1 port cable loss measurement screen
No.
Description
Measurement Mode Name
Measurement Chart
Trace(s)
– Up to 4 traces
Marker(s)
– Up to 6 markers
Readout for Active Marker
Limit Line(s)
– Traces out of the specified limits are displayed in red color
Trace Legend
– For "Indoor" display mode
Trace 1
Active Marker
for each trace
C
Captured Trace
Trace 2
W
Current Trace (Clear Write)
Trace 3
L
Loaded Trace
Trace 4
F
Trace Off