68 Keysight M8194A 120 GSa/s Arbitrary Waveform Generator User Guide
3 M8194A Soft Front Panel
• Mod. Index(%)
This edition field only shows up when the ASK modulation scheme is
selected. It sets the modulation index as a percentage for the signal.
• R2/R1 Ratio
This edition field only shows up when the 16APSK, 32APSK, and
16STAR modulation schemes are selected. It sets the ratio between the
radius of the two inner symbol rings in the constellation.
• R3/R1 Ratio
This edition field only shows up when the 32APSK modulation scheme
is selected. It sets the ratio between the radius of the outer and the
most internal symbol rings in the constellation.
• Freq. Dev.
This edition field only shows up when the FSK modulation schemes are
selected. It sets the peak frequency deviation in Hz.
• Mod. File..
This button only shows up when ‘Custom’ modulation scheme is
selected. It opens a file selection window where modulation definition
files may be selected. If a valid file is selected, its name will show up in
the text field located at the left of this button. Otherwise, a “File
Loading Error” message is shown.
• Pulse Shaping
This drop-down list can select different pulse shaping to be applied to
the baseband symbols; choices are ‘Root Raised Cosine’, ‘Raised
Cosine’, ‘Gaussian’, ‘Rectangular’, ‘None‘, ‘EDGE’, and ‘Half Sine’.
Notes:
• The default pulse shape is ‘Gaussian’.
• The filter types ‘None’ and ‘Rectangular’ define the pulse shape in
time domain. These filter types can only be applied for integer
oversampling. Examples: Filter type ‘None’ with 4 times
oversampling generates one sample with the actual value followed
by 3 samples with a value of zero (Dirac-Pulse). The filter type
‘Rectangular’ with 4 times oversampling generates 4 identical
sample values.
• The filter types ‘Root Raised Cosine’, ‘Raised Cosine’, ‘Gaussian’,
‘EDGE’, and ‘Half Sine’ describe the filter shape in frequency
domain.
• Alpha / BT
The meaning and labeling of this edition field depends on the selected
pulse shaping. For “Nyquist” filters (Raised Cosine and Square Root of
Raised Cosine) it is the ‘Alpha’ parameter (or roll-off factor) of the filter.
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