Agilent Technologies E4428C, User Manual

Page: 486 / 700

462 Chapter 16
W-CDMA Uplink Digital Modulation for Receiver Test
Generating a Single PRACH Signal
Generating a Single PRACH Signal
Using the single PRACH mode may turn the ESG ALC feature off. For reliable results, you may need to
perform a power search. Refer to
“Special Power Control Considerations When Using DPCCH/DPDCH in
Compressed Mode or PRACH” on page 570 before completing this procedure.
The ESG is capable of transmitting a PRACH using the factory default channel parameters. This aspect of
the ESG is demonstrated in the following procedures.
Configuring the RF Output
1. Preset the ESG.
2. Set the carrier frequency to 1.95 GHz.
3. Set the carrier power to
−
10 dBm.
4. Turn on the RF output.
Selecting the PRACH and Single PRACH Modes
1. Press
Mode
>
W-CDMA
>
Real Time W-CDMA
>
Link Down Up
to Up.
2. Press
Link Control
>
PhyCH Type
>
PRACH
.
3. Press the
PRACH Mode Single Multi
softkey until Single is highlighted.
The factory default setting is the Single PRACH mode.
Selecting a Rear Panel Output Trigger
1. Press
PRACH Rear Panel Setup
>
PRACH Output Signal Setup
.
This sets up an output trigger signal at the EVENT 1 rear panel connector. Refer to “Configuring Rear
Panel Output Signals” on page 545 for more information.
2. Highlight the item under the
Signal
column that corresponds to
Event1
under the
Rear Panel
Ports
Column.
3. Press
More (1 of 3)
>
More (2 of 3)
>
PRACH Pulse (RPS23)
.
This will enable an output trigger that corresponds to the beginning of each PRACH.