Chapter 16 483
W-CDMA Uplink Digital Modulation for Receiver Test
Setting Up a Multiple PRACH Signal
terminated by some other means (RF is turned off, modulation of the carrier is turned off, or the
modulation format is turned off). To access the Infinity selection, you must press the
Edit Item softkey.
c. Press
100 > Enter.
The range for a finite transmission is 1 to 2147447836 repetitions. However the transmission will not
be limited unless Trigger has been selected as the PRACH trigger source.
d. Press
Apply Channel Setup.
When the Apply Needed annunciator appears, press the
Apply Channel Setup softkey. The new
parameters will not be applied to the signal until this softkey is pressed.
e. Press the
PRACH Trigger Source Immedi Trigger softkey until Trigger is highlighted.
In order to transmit a limited number of 80 ms periods, you must set the PRACH signal for a manual
trigger operation. If the W-CDMA format is on when you select Trigger, the signal will transmit until
the value in the Number of 80ms field has been reached. Then the PRACH signal will terminate
and the RACH Trg annunciator will gray-out. This means that the PRACH signal is waiting for a
trigger to occur before another transmission can begin. This is shown in Figure 16-27. Notice that the
PRACH Trigger softkey has become active (no longer grayed out) when Trigger was highlighted.
Figure 16-27 PRACH (RACH) Trigger Annunciator
f. Press the
PRACH Trigger softkey.
The ESG is now transmitting 100 repetitions, entered in step 2c, of the current
80 ms period setup. The RACH Trg annunciator will gray-out after 100 repetitions have been
completed. To repeat the transmission, just press the
PRACH Trigger softkey again.
Waiting for
Trigger
Trigger Received
Softkey is now Active
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