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154 Chapter 7
Custom Real Time I/Q Baseband
Working with Burst Shapes
Burst shape maximum rise and fall time values are affected by the following factors:
• the symbol rate
• the modulation type
When the rise and fall delays equal 0, the burst shape attempts to synchronize the maximum burst shape
power to the beginning of the first valid symbol and the ending of the last valid symbol.
If you find that the error vector magnitude (EVM) or adjacent channel power (ACP) increases when you turn
bursting on, you can adjust the burst shape to assist with troubleshooting.
Configuring the Burst Rise and Fall Parameters
1. Press Preset.
2. Press
Mode > Custom > Real Time I/Q Baseband > Burst Shape.
3. Press
Rise Time > 5 > bits.
4. Press
Rise Delay > 1 > bits.
5. Press
Fall Time > 5 > bits.
6. Press
Fall Delay > 1 > bits.
This configures the burst shape for the custom real-time I/Q baseband digital modulation format. For
instructions on creating and applying user-defined burst shape curves, see “To Create and Store
User-Defined Burst Shape Curves” on page 155.