Measurement Example: Demodulating an FM Signal
R&S
®
FSW-K7
165User Manual 1173.9240.02 ─ 17
Fig. 9-4: RF spectrum of FM signal with default demodulation bandwidth = 5
MHz
8.
As you can see in figure 9-4, the default demodulation bandwidth of 5 MHz is much
too large - the actual signal takes up only a small part of the displayed range. That
means that any noise or additional signals apart from the FM signal of interest may
be included in the measured results. Select the "Demod BW" softkey and reduce
the value to 200
kHz.
Fig. 9-5: RF spectrum with demodulation bandwidth = 200
kHz
The span is automatically reduced to 200 kHz as well, as only the demodulated
range can be displayed.
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