Chapter 7 191
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 HIDDEN
• “To Set the External DATA CLOCK to Receive Input as Either Normal or Symbol” on page 191
• “To Set the BBG DATA CLOCK to External or Internal” on page 192
• “To Adjust the I/Q Scaling” on page 192
To Set the External DATA CLOCK to Receive Input as Either Normal or Symbol
1. Press Mode > Custom > Real Time I/Q Baseband > More (1 of 3) > Configure Hardware.
Configure Hardware allows you to access a menu from which you can set the external DATA
CLOCK to receive input as either Normal or Symbol.
2. Press
Ext Data Clock to select either Normal or Symbol; this setting has no effect in internal clock
mode.
• When set to Normal, the DATA CLOCK input connector requires a bit clock.
• When set to Symbol, a one–shot or continuous symbol sync signal must be provided to the
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