LimeQuickTest Failed

General Discussion
1

Hello,

Recently I bought a LimeSDR-USB board. But when I do LimeQucikTest, the result is “RF Loopback Test FAILED”, as follows:

[ RF Loopback Test ]
Note: The test should be run without anything connected to RF ports
->Configure LMS
->Run Tests (TX_2-> LNA_L):
CH0 (SXR=800.0MHz, SXT=805.0MHz): Result:(-15.3 dBFS, 5.00 MHz) - PASSED
CH1 (SXR=800.0MHz, SXT=805.0MHz): Result:(-17.2 dBFS, 5.00 MHz) - PASSED
->Run Tests (TX_1 → LNA_W):
CH0 (SXR=1800.0MHz, SXT=1805.0MHz): Result:(-16.2 dBFS, 5.00 MHz) - PASSED
CH1 (SXR=1800.0MHz, SXT=1805.0MHz): Result:(-21.5 dBFS, 5.00 MHz) - FAILED
->Run Tests (TX_2-> LNA_H):
CH0 (SXR=2500.0MHz, SXT=2505.0MHz): Result:(-18.4 dBFS, 5.00 MHz) - PASSED
CH1 (SXR=2500.0MHz, SXT=2505.0MHz): Result:(-18.5 dBFS, 5.00 MHz) - PASSED
->RF Loopback Test FAILED

=> Board tests FAILED <=

Certainly, the RF port connect nothing when I do the test.

Then what does that mean, is there any problem on my board?

Thanks and hoping for your reply.

Zhibin Luo

2

The signal level is down slightly on one path and it’s not a hard failure and it’s likely this may have no impact. As well as having nothing connected to the RF ports, the board also needs to be cold and can fail on loopback tests if it’s warm. The criteria are as used in the factory, with cold boards and no RF cabling.

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3

Thanks for your reply.

I have tried FM radio and GNSS signal collection/processing. At present there is no effect on my experiment. It works well.

Thank you very much!

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