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Chapter 10 Using CDMA Signal Analyzer
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 within the channel bandwidth (1.23 MHz for cdmaOne).
After configuring test parameters as described in the "Configuring test parameters" on page 297, your
measurement result is displayed on the screen as like the following example, Figure 148.
Figure 148 Channel power measurement with CDMA 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 310 for more
information.
Occupied bandwidth
The Occupied Bandwidth measures the spectrum shape of the carrier. It is defined as the bandwidth,
which includes 99% of the transmitted power among total transmitted power.
After configuring test parameters as described in the "Configuring test parameters" on page 297, your
measurement result is displayed on the screen as like the following example, Figure 149.
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JD700B Series User's Guide
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