User`s guide

Chapter 15 363

W-CDMA Uplink Digital Modulation for Receiver Test

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 453 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 426 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.

4. Press

Mode Setup to return to the top-level real-time W-CDMA menu.