Modifying a single–carrier nadc setup – Agilent Technologies E8267D PSG User Manual
Page 174
160
Chapter 6
Custom Arb Waveform Generator
Working with User–Defined Setups (Modes)-Custom Arb Only
2.
Press
Mode
>
Custom
>
Arb Waveform Generator
>
Setup Select
.
3.
Select either:
•
one of the predefined modulation setups:
NADC
,
PDC
,
PHS
,
GSM
,
DECT
,
EDGE
,
APCO 25 w/C4FM
,
APCO
25 w/CQPSK
,
CDPD
,
PWT
, or
TETRA
This selects a predefined setup where filtering, symbol rate, and modulation type are defined
by the predefined modulation setup (mode) that you selected and returns you to the top–level
custom modulation menu; it does not include bursting or channel coding.
or
•
Custom Digital Mod State
This selects a custom setup stored in the Catalog of DMOD Files. (For information on
creating a custom digital modulation setup, refer to
“Working with User–Defined Setups
(Modes)- Custom Arb Only” on page 160
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.