
384 Chapter 15
W-CDMA Uplink Digital Modulation for Receiver Test
Setting Up a Multiple PRACH Signal
once a trigger is received until it is 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 15-27. Notice that the
PRACH Trigger
softkey has become active (no longer grayed out) when Trigger was highlighted.
Figure 15-27 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.
You will notice the
PRACH Trigger Source Immedi Trigger and the PRACH Trigger are located
on several softkey menus. This was done so you could provide the trigger or make a
Waiting for
Trigger
Trigger Received
Softkey is now Active
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