User`s guide

380 Chapter 15

W-CDMA Uplink Digital Modulation for Receiver Test

Setting Up a Multiple PRACH Signal

The ESG automatically turns off the ALC (automatic leveling control) when the multiple

PRACH mode is selected. This is due to the bursting characteristics of the PRACH signal that

causes rapidly varying power levels. This situation is compounded in the multiple PRACH

mode where you have multiple PRACH bursts occurring, so the ESG ALC cannot maintain a

constant power level. A manual power search can be performed by pressing the

Apply Channel

Setup

softkey. Refer to “Special Power Control Considerations When Using DPCCH/DPDCH

in Compressed Mode or PRACH” on page 453 for more information.

The procedure, “Selecting the PRACH and Multiple PRACH Modes” on page 381, shows you

how to access the W-CMA modulation format. However most of the other procedures start

from the first-level W-CDMA softkey menu, which is shown in Figure 15-24. In this way, each

procedure can stand alone without regard to steps performed in other sections.

Figure 15-24 First-Level W-CDMA Softkey Menu

By following the procedures in this section, you will learn how to setup a basic multiple

PRACH signal. The section, “Viewing a Multiple PRACH Signal” on page 395, shows the

output of the ESG using the parameters set in each of 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.