JDS Uniphase CellAdvisor JD780A Series, User Manual

Page: 270 / 592

JD780A Series Analyzers
270
Using LTE
– TDD Signal Analyzer
Procedure
1.
Connect an external reference or a GPS antenna to the JD780A series.
2.
Press the SYSTEM hot key.
3.
Press the Freq Reference soft key, and then select the reference option: Internal , External 10
MHz , External 13 MHz , External 15 MHz , or GPS .
Table 15 External reference indicators
Type Indicator Description
Internal
(green)
The green INT icon indicates that the instrument uses the built-in
internal time base.
External
(green)
The green EXT icon indicates that an external reference is connected
and locked and that the instrument uses the same reference clock as
the signal source.
External
(red)
The red EXT icon indicates that an external reference is connect but not
locked.
GPS (green) The green GPS antenna icon indicates that a GPS antenna is
connected and locked.
GPS (yellow) The yellow GPS antenna icon indicates that a GPS antenna is
connected and locking is in progress.
GPS (grey) The grey GPS antenna icon indicates that a GPS antenna is not
connected, failed, or unable to be locked.
Conducting spectrum measurements
Setting measure setup
After configuring test parameters as described in the
“Configuring test parameters” on page 265, you
can continue your measurement.
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.
c. Press the Enter soft key.
4.
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.
Your measurement result is displayed on the screen as like the following example, Figure 120.