[Discuss-gnuradio] USRP N210 Potentially Fried

[Justyn Bell]

Hello list,

We had a group of students working with two of our USRP N210s, and they 
had a problem receiving.. anything.  The USRP, however, still transmits.

I have verified that the USRP indeed doesn't receive a signal by 
attaching an FFT to the output of a UHD:USRP Source and transmitting 
both from another USRP as well as an analog handset we have in the lab.  
I can verify that both sources are transmitting (the handset at pretty 
high power) via a spectrum analyzer.  However, the FFT doesn't move in 
average amplitude at all, it remains around -65dB.

I've also tried re-flashing the firmware to no avail.  I also switched 
out one of the defective N210s for a third that we own, and verified 
that it works as normal.

Is there a better way of troubleshooting this, or has this ever occurred 
before?  Because they both can't receive today, and were tested and 
worked yesterday, this can't be a coincidence.  The antennas were not 
touched or moved at all, which would rule out the students doing 
something stupid like directly connecting the two RF ports.

What do I do next?

--
Justyn