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160 Chpater 6
Custom Arb Waveform Generator
Working with Modulation Types
6. Press -1.8 > kHz.
Each time you enter a value, the Data column increments to the next binary number, up to a
total of 16 data values (from 0000 to 1111). An unstored file of frequency deviation values is
created for the custom 4-level FSK file.
7. Press
Load/Store > Store To File.
If there is already a file name from the Catalog of FSK Files occupying the active entry
area, press the following keys:
Edit Keys > Clear Text
8. Enter a file name (for example, NEWFSK) using the alpha keys and the numeric keypad.
9. Press
Enter.
The user-defined FSK modulation should now be stored in the Catalog of FSK Files.
Modifying a Predefined FSK Modulation Type User File with the Frequency Values Editor
Using the Frequency Values editor, you can define, modify, and store user-defined frequency shift
keying modulation. The Frequency Values editor is available for custom Real-Time I/Q Baseband
mode, but is not available for waveforms generated in custom Arb Waveform Generator mode. Use
this example to learn how to add errors to a default FSK modulation.
1. Press
Preset.
2. Press
Mode > Custom > Real Time I/Q Baseband > Modulation Type > Define User FSK > More (1 of 2) > LoadDefault
FSK
.
3. Press
Freq Dev > 1.8 > kHz.
4. Press
4-Lvl FSK.
This sets the frequency deviation and opens the Frequency Values editor with the 4-level FSK
default values displayed. The frequency value for data 0000 is highlighted.
5. Press
-1.81 > kHz.
6. Press
-590 > Hz.
7. Press
1.805 > kHz.
8. Press
610 > Hz.
As you modify the frequency deviation values, the cursor moves to the next data row. An
unstored file of frequency deviation values is created for your custom 4-level FSK file.
9. Press
Load/Store > Store To File.
If there is already a file name from the Catalog of FSK Files occupying the active entry
area, press the following keys:
Edit Keys > Clear Text
10. Enter a file name (for example, NEWFSK) using the alpha keys and the numeric keypad.
11. Press
Enter.
The user-defined FSK modulation should now be stored in the Catalog of FSK Files.