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122 Chapter 6
Custom Arb Waveform Generator
Working with User-Defined Setups (Modes)-Custom Arb Only
Working with User-Defined Setups (Modes)−Custom Arb Only
Modifying a Single-Carrier NADC Setup
In this procedure, you learn how to start with a single-carrier NADC digital modulation and modify it to a
custom waveform with customized modulation type, symbol rate, and filtering.
1. Press
Preset.
2. Press
Mode > Custom > ARB Waveform Generator > Setup Select > NADC.
3. Press
Digital Mod Define > Modulation Type > PSK > QPSK and OQPSK > QPSK.
4. Press
Symbol Rate > 56 > ksps.
5. Press
Filter > Select > Nyquist.
6. Press
Return > Return > Digital Modulation Off On.
This generates a waveform with the custom single-carrier NADC digital modulation state. The display
changes to Dig Mod Setup: NADC (Modified). During waveform generation, the DIGMOD and
I/Q annunciators appear and the custom single-carrier digital modulation state is stored in volatile
memory.
7. Set the RF output frequency to 835 MHz.
8. Set the output amplitude to 0 dBm.
9. Press
RF On/Off.
The user-defined NADC signal is now available at the RF OUTPUT connector.
10. Press
Return > Return.
This returns to the top-level Digital Modulation menu, where
Digital Modulation Off On is the first softkey.
11. Press
Digital Mod Define > Store Custom Dig Mod State > Store To File.
If there is already a file name from the Catalog of DMOD Files occupying the active entry
area, press:
Edit Keys > Clear Text
12. Enter a file name (for example, NADCQPSK) using the alpha keys and the numeric keypad.
13. Press
Enter.
The user-defined single-carrier digital modulation state should now be stored in non-volatile memory.
The RF output amplitude, frequency, and operating state settings are not stored as part of a user-defined
digital modulation state file.