LimeSDR Mini Test LNAW Fail


#1

I have a LimeSDR Mini, with the QuickTest i have this output:

[ TEST STARTED ]
->Start time: Sun Feb 10 10:41:00 2019

->Device: LimeSDR Mini, media=USB 3, module=FT601, serial=1D40F7476890F5, index=0
Serial Number: 1D40F7476890F5

[ Clock Network Test ]
->REF clock test
Test results: 3787; 16984; 30181 - PASSED
->VCTCXO test
Results : 6711019 (min); 6711174 (max) - PASSED
->Clock Network Test PASSED

[ FPGA EEPROM Test ]
->Read EEPROM
data: 18 06 29 18 06 29 2
->FPGA EEPROM Test PASSED

[ LMS7002M Test ]
->Perform Registers Test
->External Reset line test
Reg 0x20: Write value 0xFFFD, Read value 0xFFFD
Reg 0x20: value after reset 0x0FFFF
->LMS7002M Test PASSED

[ RF Loopback Test ]
->Configure LMS
->Run Tests (TX_2 -> LNA_W):
->On board loopback test:
Test 1:(SXR=1000.0MHz, SXT=1005.0MHz, TXPAD=8): Result:(-28.5 dBFS, 5.00 MHz) - FAILED
->Configure LMS
->Run Tests (TX_1 -> LNA_H):
->On board loopback test:
Test 1:(SXR=2100.0MHz, SXT=2105.0MHz, TXPAD=8): Result:(-16.8 dBFS, 5.00 MHz) - PASSED
->RF Loopback Test FAILED

=> Board tests FAILED <=

Elapsed time: 4.93 seconds

Screen IMG

Is it normal??


#2

I made this test both with Windows 10 than Ubuntu 18.04.
I don’t know if internal LNA is broken.
Anyone can suggest to me some test for verify that is all ok?

Thank You


#3

It looks as though there has been damage to the TX_2 > LNA_W path, hence the reduced level. This could be physical damage or overload on input.


#4

What could i do? Can i fix it?


#5

It’s unlikely that this is something you could fix yourself, unless you can see physical damage and are confident in repairing this.


#6

But i didn’t do anything strange… I ever used a simply dipole antenna. If is a damage on the board, like a capacitor, or resistor i can try to do something.
Otherwise i can’t do anything…