Channel
Independent checkboxes allow the definition of waveforms for Channel 1,
Channel 2, Channel 3 or Channel 4.. One of the boxes will be always checked.
When pressing the ‘Send To Instrument’ button, the waveform is sent to all
channels that are checked.
Segment Number
Target segment for each channel can be defined independently. This field is
configurable only for channels sourced from ‘extended’ memory. The segment
range is 1 to 16777216. For channels sourced from ‘Internal’ memory, the
segment is always set to 1, and it displays the text ‘Internal’.
Modulation Parameters Section
Mod. Scheme
This drop-down list selects the different modulation scheme categories that
are supported (see list above).
Mod. Type/Mod. Order
This drop-down list selects the different modulation orders or modulation
scheme sub-types for the selected modulation scheme category.
Carrier Freq. / Offset Freq.
The purpose and labeling of this edition field changes depending on the
generation mode. For the direct RF generation mode, it handles the carrier
frequency while for the I/Q Data Generation mode it deals with the offset
frequency (see the Apply Offset Freq. control). Units in both cases are in Hz.
Symbol Rate
This edition field must be used to enter the signaling speed (or baud rate) for
the modulated signal expressed in Bauds (1 Baud = 1 Symbol/s).
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’.
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