Modulation Analysis
R&S
®
Spectrum Rider FPH
245
User Manual 1321.1011.02 ─ 11
The R&S Spectrum Rider opens the "File Manager" dialog to select the limit line
file.
3. Select the limit line file you require from the file manager.
Note: The limit line is edited using the Ama AM or FM limit line editor from R&S
InstrumentView software package.
4. Select "Load" softkey.
The R&S Spectrum Rider activates and loads the limit line values in the table.
See
.
5. Select the "Audio Beep" softkey to turn on or off the acoustic audio signal for the
limit line check status.
See index 5 of
.
6. Select "Clear Limits" softkey to unload the limit line file.
10.2
Digital Demodulation
The Digital Demodulation measurement analyzes the Amplitude Shift Keying (ASK)
and Frequency Shift Keying (FSK) modulated signals and calculates the digital modu-
lation parameters. The results are displayed in four different
"Eye Diagram", "Symbols", "Modulation Depth" for ASK or "Modulation Deviation" for
FSK and "Modulation Error".
The firmware option R&S FPH-K7 provides the necessary measurement functions to
analyze ASK and FSK modulated signals.
Example:
ASK signal modulated with a carrier frequency 500MHz, using root cosine filter with roll
factor of 0.5 and symbol rate of 10ksym/s is generated. External reference signal from
the generator is connector to the R&S Spectrum Rider.
Digital Demodulation
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