LimeQuickTest fails on TX_1 -> LNA_W (CH1) (LimeSDR-USB)


#1

Hello,

I have an issue with my LimeSDR USB since I received it. The basic LimeQuickTest program fails the test TX_1 -> LNA_W (CH1) :

[ TESTING STARTED ]
->Start time: Sat Feb  2 00:13:13 2019

->Device: LimeSDR-USB, media=USB 3.0, module=FX3, addr=1d50:6108, serial=00090726XXXXXXXX
  Serial Number: 00090726XXXXXXXX

[ Clock Network Test ]
->FX3 GPIF clock test
  Test results: 65211; 3431; 7187 - PASSED
->Si5351C test
  CLK0: 17554 / 17554 - PASSED
  CLK1: 17554 / 17554 - PASSED
  CLK2: 17554 / 17554 - PASSED
  CLK3: 17554 / 17554 - PASSED
  CLK4: 17554 / 17554 - PASSED
  CLK5: 17554 / 17554 - PASSED
  CLK6: 17554 / 17554 - PASSED
->ADF4002 Test
  Result: 10 - PASSED
->VCTCXO test
  Results : 5112947 (min); 5113081 (max) - PASSED
->Clock Network Test PASSED

[ FPGA EEPROM Test ]
->Read EEPROM
->Read data: 12 07 19 12 07 19 02
->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_L):
  CH0 (SXR=800.0MHz, SXT=805.0MHz): Result:(-16.9 dBFS, 5.00 MHz) - PASSED
  CH1 (SXR=800.0MHz, SXT=805.0MHz): Result:(-18.1 dBFS, 5.00 MHz) - PASSED
->Run Tests (TX_1 -> LNA_W):
  CH0 (SXR=1800.0MHz, SXT=1805.0MHz): Result:(-18.3 dBFS, 5.00 MHz) - PASSED
  CH1 (SXR=1800.0MHz, SXT=1805.0MHz): Result:(-24.6 dBFS, 5.00 MHz) - FAILED
->Run Tests (TX_2-> LNA_H):
  CH0 (SXR=2500.0MHz, SXT=2505.0MHz): Result:(-17.9 dBFS, 5.00 MHz) - PASSED
  CH1 (SXR=2500.0MHz, SXT=2505.0MHz): Result:(-16.6 dBFS, 5.00 MHz) - PASSED
->RF Loopback Test FAILED

=> Board tests FAILED <=

Elapsed time: 2.54 seconds

So far I’ve tested many different configurations to try to solve the issue :

  • different computers (Windows, Linux, or even VM Ubuntu)
  • USB 3 and USB 2 ports
  • with and without enclosure
  • swap antennas
  • firmware downgrading

But the problem persists anyway.

The TX_1 level seems really low, I think there’s a hardware defect.

@andrewback , @Zack , could you please advise ?

Thank you

Regards,
Fred


#2

Hello @andrewback

my board is unusable, could you please provide support for RMA ?

Thank you
Regards,
Fred


#3

@Zack can you please diagnose and advise whether an RMA is in order.