378 Chapter 13
Custom Digital Modulation
Using the Real Time I/Q Baseband Generator
Using the Real Time I/Q Baseband Generator
The custom real-time format enables you to create unframed digital modulation with user-defined data,
filtering, symbol rate, modulation type, burst shape, differential data encoding, and other format parameters.
You can choose a predefined mode where filtering, symbol rate and modulation type are defined by the
digital modulation standard, or a user-defined custom modulation.
Selecting Predefined Custom Modulation Modes
1. Press Preset.
2. Press
Mode > Custom > Real Time I/Q Base Band.
3. Press
More (1 of 3) > More (2 of 3) > Predefined Mode > APCO 25 w/C4FM.
4. Press
More (3 of 3).
This selects a predefined mode where filtering, symbol rate and modulation type are defined by the
APCO 25 w/C4FM digital modulation standard and returns you to the top-level custom modulation
menu. To configure data, burst shape, and differential data encoding parameters, see the next section,
“Creating User-Defined Custom Modulation.”
To output this predefined custom modulation, complete the steps in “Generating the Waveform” on
page 380 and “Configuring the RF Output” on page 380.
NOTE To deselect a predefined mode, press the following keys:
Mode > Custom > Real Time I/Q Base Band > More (1 of 3) > More (2 of 3) > Predefined Mode >
None
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