User`s guide

266 Chapter 10
GPS Modulation
Setting Up a GPS Bit Error Rate Test
Setting Up a GPS Bit Error Rate Test
This section shows how to make GPS BER measurements using the ESG Signal Generator
with Option UN7.
The following procedures explain how to set up the ESG for making BER measurements:
• “Connecting the Test Equipment” on page 267
• “Setting the Carrier Frequency and Power Level” on page 267
• “Selecting the Data Format” on page 268
• “Setting Up the GPS Receiver” on page 268
• “Selecting the BERT Data Pattern and Total Bits” on page 268
• “Selecting the BERT Trigger” on page 268
• “Starting BERT measurements” on page 269
Required Equipment
The following equipment is required to make BER measurements.
• ESG Signal Generator, model E4438C with Options 001 or 002, 409, and UN7
• an external controller to control the receiver under test
• 20dB attenuator
• an interface level matching circuit for interfacing between the receiver under test and the
signal generator when the receiver signal specifications are different from those of the
signal generator