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Chapter 4, Troubleshooting
Errors While Attempting Measurements
Frame Error Rate
(Receiver
Measurements)
Problem:
If your Test System is not set up correctly for receiver tests, you may see
erroneous results (extremely high FER or the inability to return a measurement)
on the tool you use for displaying the Frame Error Rate calculated by the base
station.
The error can occur while using the following menu screen:
• CDMA Generator Menu Selection
Possible causes and solutions:
1 Missing an Even-Second clock timing signal.
You must have access to the Even-Second clock signal from the base station to
achieve proper correlation to the CDMA signal. Verify that the signal is accessible
and make sure that it is connected to the EVEN SECOND/SYNC IN port on front of
the Cellular Adapter. To verify your Even-Second clock, see "Check Even-Second
Clock" on page 46.
2 Test System timebase reference not connected.
Verify that you have access to the base station’s reference timebase signal (typically
19.6608 MHz). The reference should be connected to the SYNTH REF IN port on the
rear of the Cellular Adapter. If configured correctly, the REF UNLOCK indicator on
the Cellular Adapter should not be on.
3 Missing or faulty connections from the PCS Interface output to the receiver inputs of
the base station.
Check to see that the RF IN/OUT port of the PCS Interface is connected to the
receiver test port of the base station being tested.
4 Incorrect Base Station Channel entry.
The Software tunes the CDMA Generator to a receive frequency based on your entry
for Base Station Channel. The entry must match the channel your base station
is set to receive on. Verify the channel number entry in the Base Station
Channel field on the main menu screen. If you want to verify the frequency the
Generator is set to, see the Generator Frequency setting at the bottom of the
main menu screen.