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Over–the–Air Measurements (OTA) – LTE FDD Option 370, LTE TDD Option 371, 5G TF
Option 377, 5G NR / 5G NR EVM Conducted Option 378
Troubleshooting
Troubleshooting
If your OTA setup is not behaving as expected:
— Verify setup is correct by referring to
Keysight N9938-90006 User's Guide
Mode Settings" on page
— Attenuator set to 0 dB
— Preamplifier set to ON
— Correct Band, Channel, and Center Frequency entered
— GNSS set to Internal
— Frequency Ref set to GPS
— For LTE FDD and LTE TDD: Verify that the Frequency Error Threshold
(dB)—(FreqError Th) value is large enough or not too large
— For LTE FDD and LTE TDD: Verify that the Extend Freq Lock value is
enabled and then adjust settings to improve your measurement. For
5G TF: Check that the Frequency Correction Threshold value (%)—
(Sync Corr Th %) is small enough or not too large.
— ADC errors: Use Scale/Amptd >
level (dBm).
For some data views, you need to press
softkey.
— No data displayed: Press Meas Setup 4 – Only required if scan does
not display data.
——LTE FDD and LTE TDD: Press
– Wait a few seconds until table populates or set
Range
to Extended.
——Then change back to the desired Frequency Error
Threshold for your measurement.
——5G TF: Press
seconds until the Table populates and
——Then change back to the desired Sync Correlation
Threshold for your measurement.
"How to Set Up Over–the–Air (OTA)
353.
Range
to adjust the absolute power
More
FreqError Th
SyncCorr Th
and change to 0% – wait a few
to view the
Range
and change to 5 kHz
FreqLock
399
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