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JD780A Series Analyzers
140
Using GSM/GPRS/EDGE Signal Analyzer
Measurement example
Figure 46
Power vs. time (frame) measurement with GSM signal analyzer
Conducting constellation measurements
The Constellation is used to observe some aspects of modulation accuracy and can reveal certain
fault mechanisms such as I/Q amplitude imbalance or quadrature imbalance. It displays constellation
diagram by modulation types.
Setting measure setup
After configuring test parameters as described in the
“Configuring test parameters” on page 125, you
can continue your measurement. The measurement settings can be saved and recalled as a file.
Procedure
1.
Press the
MEASURE SETUP
hot key.
2.
Press the
Time Slot
soft key to assign a time slot with which performs measurements, and then
select your desired time slot number from
0
to
7
.
3.
Press the
Detect Mode
soft key, and then select the signal standard option:
Auto
,
GSM
, or
EDGE
. Auto is set by default. The instrument applies a mask automatically based on the selected
mode.
4.
Toggle the
PSK Constellation
soft key between
On
and
Off
to enable or disable the PSK
constellation observation.
NOTE
The PSK constellation must be turned on to analyze EDGE signals.
5.
Optional
. To set the delay, complete the following steps:
a.
Press the
Miscellaneous
soft key.
b.
Press the
Delay
soft key to set the amount of delay in µs.
c.
Enter a value by using the numeric keys. You can also use the rotary knob.
d.
Press the
µs
soft key.
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...
Page 525: ......
Page 590: ...JD780A Series Analyzers 590 Appendix Figure 306 Append keywords window...