Chapter 11
Using EV-DO Signal Analyzer
JD700B Series User’s Guide
395
screen. You can set it to
Unlimited
to hold and view maximum or minimum data or
specify a certain amount of time up to 60 seconds by using numeric keys or rotary knob.
4
Optional
. Select
More (1/2) > Trace Info
, 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.
5
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, power spectral density (PSD) and peak to
average ratio (PAR) of the signal in the EV-DO channel bandwidth (1.23 MHz).
After configuring test parameters as described in the “Configuring test parameters” on page 389, your
measurement result is displayed on the screen as like the following example, Figure 233.
Figure 233 Channel power measurement with EV-DO signal analyzer
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 RF tests” on page 401 for more
information.