JDS Uniphase CellAdvisor JD780A Series, Руководство пользователя

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JD780A Series Analyzers
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Using CDMA Signal Analyzer
a. Press the PN Increment soft key.
b. Enter a value by using the numeric keys.
c. Press the Enter soft key.
3.
Optional . Go to SAVE/LOAD > Save , and then select the save option from the choices available
for your measurement mode. See
“Using save” on page 31 for more information.
Measurement example
Figure 171 PN scanner measurement with CDMA OTA signal analyzer
Multipath profile
The Multipath Profile enables you to determine RF environmental conditions of testing area. It
indicates the amount of power of the dominant pilot signal that is dispersed outside the main
correlation peak due to multipath echoes that are expressed in dB. This value should be very small
ideally.
The multipath profile is the result of portions of the original broadcast signal arriving at the receiving
antenna out of phase. This can be caused by the signal being reflected off objects such as buildings,
or being refracted through the atmosphere differently from the main signal.
Setting measure setup
After configuring test parameters as described in the
“Configuring test parameters” on page 334, you
can continue your measurement. The measurement settings can be saved and recalled as a file. You
can also use JDViewer, PC application software to configure a measure setup, save as a file, and load
the file on to the instrument.
Procedure
1.
Press the MEASURE SETUP hot key.
2.
To set the incremental step for the PN offset, complete the following steps:
a. Press the PN Increment soft key.