266 Chapter 9
BERT
Setting Up a PHS Bit Error Rate Test (BERT)
Setting the Carrier Frequency and Power Level
1. Press the Preset hardkey.
2. Press the
Frequency hardkey. Using the numeric keypad, set the signal generator RF output carrier
frequency to 1.89515 GHz.
3. Press the
Amplitude hardkey. Using the numeric keypad, set the signal generator RF output amplitude to
−100 dBm.
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.
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