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Application Notes
Measuring In-Channel Power
Channel power measures the total power present in the channel bandwidth. Unlike a continuous wave (CW) signal, the power of a digitally modulated signal is spread over a wide bandwidth. Thus, calculating the total power in the channel requires a complex integration. An X-Series signal analyzer with PowerSuite makes these measurements quickly and automatically. It takes just two touches to set the center frequency and bandwidth of the measurement, and PowerSuite then performs the test automatically.
As an example, OBW is a measure of the bandwidth containing 99 percent of the total integrated power. OBW is used to confirm that the transmitter does not interfere with adjacent channels. After you enter the carrier frequency, PowerSuite quickly computes the combined power of all signal responses contained in the trace. It places markers at the frequencies bracketing the region containing 99 percent of the power and then automatically calculates the occupied bandwidth.
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