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Chapter 7 175
Custom Real Time I/Q Baseband
Configuring Hardware
8. Press Enter.
The contents of the current Rise Shape and Fall Shape editors are stored to the Catalog of
SHAPE Files. This burst shape can now be used to customize a modulation or as a basis for a
new burst shape design.
To Select and Recall a User-Defined Burst Shape Curve from the Memory Catalog
Once a user-defined burst shape file is stored in the Memory Catalog, it can be recalled for use with
real-time I/Q baseband generated digital modulation.
This example requires a user-defined burst shape file stored in memory. If you have not created and
stored a user-defined burst shape file, complete the steps in the previous sections.
1. Press
Preset.
2. Press
Mode > Custom > Real Time I/Q Baseband > Burst Shape > Burst Shape Type > User File.
3. Highlight the desired burst shape file (for example, NEWBURST).
4. Press
Select File.
The selected burst shape file is now applied to the current real-time I/Q baseband digital
modulation state.
5. Press
Return > Custom Off On.
This generates the custom modulation with user-defined burst shape created in the previous
steps. During waveform generation, the CUSTOM and I/Q annunciators activate. The waveform is
now modulating the RF carrier.
6. Press
RF On/Off.
The current real-time I/Q baseband digital modulation format with user-defined burst shape
should be available at the signal generator’s RF OUTPUT connector.
Configuring Hardware
• “To Set the BBG Reference” on page 175
• “To Set the External DATA CLOCK to Receive Input as Either Normal or Symbol” on page 176
• “To Set the BBG DATA CLOCK to External or Internal” on page 176
• “To Adjust the I/Q Scaling” on page 176
To Set the BBG Reference
Setting for an External or Internal Reference
1. Press
Mode > Custom > Real Time I/Q Baseband > More (1 of 3) > Configure Hardware.
Configure Hardware displays a menu where you can set the BBG Reference to External or
Internal.