JD780A Series Analyzers
72
Using Spectrum Analyzer
a.
Press the
Average
soft key.
b.
Enter a value between 1 and 100.
c.
Press the
Enter
soft key.
Setting limit
Procedure
1.
Press the
LIMIT
hot key.
2.
Press the
Occupied BW
soft key to set the limit parameters.
3.
Toggle the
Test Limits
soft key between
On
and
Off
to enable or disable the Pass/Fail indication.
4.
Set the upper threshold:
a.
Press the
High Limit
soft key.
b.
Enter a value for the upper limit.
c.
Select the unit:
MHz
,
kHz
, or
Hz
.
5.
Optional
. Go to
SAVE/LOAD
> Save
, and then select
Limit
to save the limit settings.
See
“Using save” on page 31 for more information.
Measurement example
The Occupied Bandwidth measurement shows both of power across the band and power bandwidth in
a user specified percentage to determine the amount of spectrum used by a modulated signal.
Occupied bandwidth is typically calculated as the bandwidth containing 99% of the transmitted power.
Figure 12
Occupied bandwidth measurement with spectrum analyzer
Spectrum emission mask (SEM)
The Spectrum Emission Mask (SEM) measurement is to identify and determine the power level of out-
of-band spurious emission outside the necessary channel bandwidth and modulated signal. It
measures the power ratio between in-band and adjacent channels. The JD780A series indicates either
Pass or Fail based on the specified limit of the signal.
Summary of Contents for CellAdvisor JD780A Series
Page 52: ...JD780A Series Analyzers 52 Getting Started Figure 6 Example of Web remote on Chrome...
Page 254: ...JD780A Series Analyzers 254 Using LTE FDD Signal Analyzer 3 RS SINR 4 S SS RSSI 5 P SS Power...
Page 323: ...JD780A Series Analyzers Using LTE TDD Signal Analyzer 323 3 RS SINR 4 S SS RSSI 5 P SS Power...
Page 390: ...JD780A Series Analyzers 390 Using EV DO Signal Analyzer 3 Pilot 4 MAC 64 5 MAC 128...
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Page 590: ...JD780A Series Analyzers 590 Appendix Figure 306 Append keywords window...
