ITC 220 Base Station, Locomotive & Wayside Radio Transceiver Field Service Guide PN 0046300120 Rev. A
| Page 87
APPENDIX G
— PROGRAM SIGNAL GENERATOR FOR DQPSK
G.1 PROGRAM AGILENT E4438C TO TEST TRANSCEIVERS WITH SPRINTS 18 TO 23.02B
Table 19 Steps for programming Agilent E4438C to test transceivers with Sprints 18 to 23.02b
Step
Action
Button / Selection
1
Power cycle unit.
On / Off
2
Enter mode to program signal generator.
Mode
3
Select “Custom” to define a custom waveform.
Custom
4
Select “Real Time I/Q Baseband.”
Real Time I/Q Baseband
5
Define the modulation type.
Modulation Type
6
Select Pi/4·DQPSK.
Pi/4·DQPSK
7
Get ready to set the other parameters.
Mode Setup
8
Define the data stream by first selecting “Data.”
Data
9
Define a custom user file.
User File
10
Create a user file.
Create File
11
Define the preamble bits using the numeric keypad.
1111 0011 0011 0111
1110 1110 1011 0110
0011 0111 0110 0110
0000 0110 0111 0010
12
Insert a PN9 sequence at the end of the preamble sequence.
INSERT
13
Select “INSERT PN9.”
Insert PN9
14
Choose “Insert PN9” (not “Seed 1FF”).
Insert PN9
15
Add a post- to the end of the sequence. Using the cursor keys (arrows), navigate the
cursor to the end of the sequence just inserted.
Arrow keys
→/↓
16
Complete a sequence of 528 bits by adding a “1.“ Note: the final byte should read
“1000 0001” or “1110 0001.”
1
17
Press Return twice.
Return Return
18
Press the “Rename” button.
Rename
19
Use the “More” button to give the user file a useful name, “DQPSK.”
D-Q-P-S-K or a suitable
unused file name.
20
Save the user file.
Enter
21
Return to an upper level by pressing “Mode Setup” to define additional parameters. Mode Setup
22
Select “Filter.”
Filter
23
Choose “Select.”
Select
24
Pick “Root Nyquist.”
Root Nyquist
25
Define the filter alpha to be 0.35 by picking “Filter Alpha.”
Filter Alpha
26
Use the numeric keypad to enter 0.35 then “Enter.”
0.35 Enter
27
Return to an upper level by pressing “Mode Setup” to define additional parameters. Mode Setup