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5
Optional. Press the More (1/2) > Trace Info soft key, and then select the trace number to view
the trace's parameter setting information stored at the time of the measurement or None to hide
the information display.
6
Optional. If you have the two traces T1 and T2, you can perform trace math. To view the power
difference between the traces, press the T1 – T2 -> T5 or T2 – T1 -> T6 soft key.
The result is overlaid on the screen along with the second Y-axis.
Conducting RF measurements
Channel power
The Channel Power measurement is a common test used in the wireless industry to measure the total
transmitted power of a radio within a defined frequency channel. It acquires a number of points
representing the input signal in the time domain, transforms this information into the frequency domain
using Fast Fourier Transform (FFT), and then calculates the channel power. The effective resolution
bandwidth of the frequency domain trace is proportional to the number of points acquired for the FFT.
The channel power measurement identifies the total RF power and power spectral density (PSD) of
the signal in the LTE channel bandwidth.
Setting measure setup
After configuring test parameters as described in the "Configuring test parameters" on page 234, 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 from the choices: 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz,
and 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: Lets the instrument detect the Cell ID for the LTE signal automatically.
–
Manual: Sets a specific Cell ID for the LTE signal manually in order to speed up the
synchronization with a BTS.
JD700B Series User's Guide
Chapter 9 Using LTE - TDD Signal Analyzer
241
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