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JD780A Series Analyzers
NOTE
You can use the LIMIT hot key to analyze your measurements with the user-definable
limit and Pass/Fail indication. See "Setting limit for modulation tests" on page 231 for
more information.
Using marker
You can use the MARKER hard key to place a marker on a resource block and display the IQ diagram
for the selected resource block.
Procedure
1.
Press the MARKER hard key.
2.
Press the RB Number soft key to select the resource block to be marked.
3.
Enter the resource block number by using the numeric keys.
4.
Press the Enter soft key.
The marker appears on the selected resource block.
5.
Toggle the Marker View soft key between On and Off to display or dismiss the result of the
selected resource block.
Control channel
The Control Channel measures the constellation for the specified control channel as well as
modulation accuracy of the control channel at the specified subframe.
Setting measure setup
After configuring test parameters as described in the "Configuring test parameters" on page 197, 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.
To set the nominal channel bandwidth to be measured, complete the following steps:
a.
Press the Bandwidth soft key.
b.
Select the bandwidth option: 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz, or 20 MHz.
3.
To select the subframe number to be measured, complete the following steps:
a.
Press the Subframe No soft key.
b.
Enter a value by using the numeric keys. You can also use the rotary knob.
NOTE
For MBMS testing, this subframe number must be neither 0 nor 5 as these subframes 0
and 5 are not available for MBMS and it must be set to the MBMS transmitted channel's
subframe number.
c.
Press the Enter soft key.
4.
Optional. Toggle the Cell ID soft key and select Auto or Manual as desired:
–
Auto: to let the instrument detect the Cell ID for the LTE signal automatically.
–
Manual: to set a specific Cell ID for the LTE signal manually in order to speed up the
synchronization with a BTS.
218
Using LTE - FDD Signal Analyzer
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