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136 Chapter 6
Custom Arb Waveform Generator
Working with Modulation Types
Working with Modulation Types
The Modulation Type menu enables you to specify the type of modulation applied to the carrier signal when
the
Mod On Off hardkey is on.
When the
Custom Off On softkey is on:
• For Custom Arb, the BBG creates a sampled version of the I/Q waveform based on a random data
pattern and the modulation type that has been selected.
• For Custom Real Time I/Q, the real-time custom I/Q symbol builder creates I/Q symbols based on the
data pattern and modulation type that has been selected (see “Working with Data Patterns” on page 147
for information on selecting a data pattern).
In Custom Real Time I/Q, you can also:
• Create user-defined modulation type (see page 137) that can be used immediately or saved to the
Memory Catalog.
• Restore all modulation parameters to their default state.
To Select a Predefined Modulation Type
1. Press Preset.
2. Press
Mode > Custom > ARB Waveform Generator > Digital Mod Define > Modulation Type > Select
or
Mode > Custom > Real Time I/Q Baseband > Modulation Type > Select
3. Select one of the available modulation types.
NOTE If you select QPSK and OQPSK, you must make a specific selection from the menu that displays.