364 Chapter 11
GPS Modulation
Real Time GPS
Selecting the BERT Trigger
1. Press
Return > Configure Trigger.
If the
BERT Trigger softkey does not show Trigger Ke y as the selected trigger, press
BERT Trigger > Trigger Key.
2. Press
Return > BERT Off On to On.
Starting BERT measurements
Press the front panel
Trigge r hardkey to start the BER measurement. You will see the measurement result
values of the Total Bits, Error Bits, and BER on the signal generator display.
NOTE If you encounter problems making a BER measurement, check the following:
• Confirm that the cables are properly connected.
• Confirm that the data pattern for the BER measurement, specified by the
Data softkey,
matches the data pattern of the receiver under test.
• Confirm that the data mode selected for the BER measurement is Raw.
• Confirm that the RF is turned on.
• Make sure that the amplitude is set to the correct level.
• Confirm that the receiver under test is controlled to receive the signal of the specified
carrier frequency.
• Confirm that the chip rate of the external source matches the chip rate set using the
GPS Ref (f0) softkey.
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