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268 Chapter 10
GPS Modulation
Setting Up a GPS Bit Error Rate Test
Selecting the Data Format
1. Press Mode > More (1 or 2) > Real Time GPS.
2. Ensure that Raw is the selected data mode.
If Raw is not the current data mode, press
Data Mode Raw Enc TLM to Raw.
3. Ensure that PN9 is the selected data sequence.
If PN9 is not the current data sequence, press
Data > PN Sequence > PN9.
4. Press
Real-time GPS Off On to On.
5. Press
RF On/Off to toggle the RF output on.
The modulated signal is now available at the RF OUTPUT connector. Notice that the display
annunciators for GPS and I/Q are on and the display annunciator RF OFF has changed to RF
ON.
Setting Up the GPS Receiver
Setup the GPS receiver to accept the carrier frequency and output the data and clock signal
used for the bit error rate measurements.
Selecting the BERT Data Pattern and Total Bits
1. Press Aux Fctn > BERT > Baseband BERT > Configure BERT.
If the
Data softkey does not show that PN9 is the selected data pattern, press
Data > PN Sequence > PN9.
2. Press Total Bits > 1000 > Bits.
1000 bits at 50 bps per second takes 20 seconds to test
.
Selecting the BERT Trigger
1. Press Return > Configure Trigger.
If the BERT Trigger softkey does not show Trigger Key as the selected trigger, press
BERT Trigger > Trigger Key.
2. Press
Return > BERT Off On to On.
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