Troubleshooting (TEDS)
This topic contains information to help you troubleshoot demod measurements when using TEDS Demodulation. Review Setting up a TEDS Measurement for additional information.
Problem |
Possible Cause |
Solution |
---|---|---|
|
Signal not present. |
Check test setup connections. Try a recorded signal to test your setup ( ). |
|
Carrier too far from center frequency. |
Adjust center frequency to ± 500 Hz of the carrier frequency ( ). |
|
Input signal is over-loaded or under ranged. |
Adjust input range ( ). |
|
Frequency span is too narrow. |
Increase frequency span ( ). |
|
TEDS signal spectrum is inverted. |
Clear: . |
|
VSA has lost synchronization symbols. |
This message is typical to carrier frequency drift over a long time record and the carrier has drifted more than 100Hz from center. Check your signal input. |
|
VSA cannot find a pulse for the slot (must be an uplink slot). |
This message is typical when you input a downlink slot for analysis, but the VSA is set for an uplink slot. Check your slot parameter settings. |
|
Refer to Troubleshooting ADS. |
|
|
Missing input signal or incorrect slot format. |
Check signal and slot format selection: |
|
Incorrect Y-axis scaling. |
Select: . |
|
Incorrect demod properties setting or input signal is bad. |
Maintain current demod properties settings and switch to a matching recorded signal to verify correct operation: . If display is correct, the problem is the input signal.If problem persists, check the following demod properties from :(except in special circumstances). (except in special circumstances). |
|
IQ Normalize feature not selected. |
Select: . |
|
Incorrect Y-axis scale, where overlaid portion requires LinMag scale. |
Modify scale: . |
|
Incorrect Y-axis scaling. |
Select: . |
|
Wrong Trace selection or wrong subcarrier selection. |
Select your trace from: and then select the subcarrier from: . |
See Also