User`s guide

Chapter 10 269
GPS Modulation
Setting Up a GPS Bit Error Rate Test
Starting BERT measurements
Press the front panel Trigger 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:
• Make sure that the cable connections are properly configured.
• Make sure that the data pattern for the BER measurement, specified by the
Data softkey, matches the data pattern of the receiver under test.
• Make sure the data mode selected for the BER measurement is Raw.
• Make sure that the RF is turned on.
• Make sure that the amplitude is set to the correct level.
• Make sure that the receiver under test is controlled to receive the signal of
the specified carrier frequency.
• Make sure the chip rate of the external source matches the chip rate set
using the GPS Ref (f0) softkey.