Agilent Technologies E8247C PSG CW - Manual (Page 132)

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.