Agilent Technologies ESG Betriebsanweisung Seite 180

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164 Chapter 6
BERT Testing
Setting Up a PHS Bit Error Rate Test
The amplitude can also be set using an Amplitude softkey, located in the Baseband BERT
softkey menu, that is accessed by pressing the
Aux Fctn > BERT > Baseband BERT softkeys.
Selecting the Radio Data Format
1. Press Mode > Real Time TDMA > PHS
This selects the PHS communications standard.
2. Toggle the
Data Format Pattern Framed softkey to Framed.
When you select Framed for bursting the frame envelope, you will be transmitting framed
data. This means that you will be bursting the timeslots that you have activated and there
will be no RF carrier during the off timeslots.
Notice that the
Configure Timeslots softkey has become an active softkey.
Observe the display and notice that the normal preset condition for downlink timeslot #1
has the timeslot turned on and configured as a traffic channel (TCH).
3. Press
Configure Timeslots.
The
Timeslot # softkey shows that downlink timeslot #1 is selected as the active timeslot.
The
Timeslot Off On softkey shows that downlink timeslot #1 is turned on. The
Timeslot Type softkey shows that downlink timeslot #1 is configured as a traffic channel.
4. Press
Configure TCH.
The
TCH softkey shows that PN9 is selected as a data pattern.
5. Press
Return > Return > PHS Off On.
At this time the internal baseband generator will generate the internal data patterns that
you have configured for Downlink timeslot 1 and Uplink timeslot 1. A message is displayed
while this process is taking place. Notice, also, that the PHS, I/Q, and ENVLP display
annunciators are turned on.
6. Press
RF On/Off to toggle RF on.
Notice that the display annunciator changes from RF OFF to RF ON. The modulated
signal is now available at the RF OUTPUT connector.
Setting the Radio to a Receiver Mode
Set the PHS radio to receive the signal of the specified carrier frequency and the timeslot 1,
and output the data used for the bit error rate measurements.
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