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Measurements and Results

R&S

FSW

220User Manual 1173.9411.02 ─ 43

Notches and their effects on the measurement results

You can select from an automatic measurement mode that selects the integration

bandwidth automatically, and a manual measurement mode that allows you to define a

custom integration bandwidth.

In automatic measurement mode, the power within the notches is deducted from the

total noise power density.

Channel Bandwidth

Notch 1

Notch 2

Integration Bandwidth

Figure 7-39: Auto mode: Integration bandwidth = channel bandwidth (notches deducted)

In manual measurement, however, the notch power is not deducted. In manual mode,

the application simply integrates all measured powered levels over the integration

bandwidth, including the power levels measured within the notches.

Channel Bandwidth

Notch 1

Notch 2

Integration Bandwidth

Figure 7-40: Manual mode: Integration bandwidth

≠

channel bandwidth (notches not deducted)

Overlapping notches or notches outside the channel bandwidth

Note that measurement results can become inaccurate when notches overlap or lie

outside of the channel bandwidth.

NPR measurements with signal generator control

To test the NPR of a satellite channel with multiple notch filters using a signal genera-

tor, you must configure the same settings on the analyzer and on the generator. The

R&S FSW can now take control of the connected generator, so that you only need to

Noise Power Ratio (NPR) Measurement

R&S FSW Series User Manual

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