Forum: GNU Radio USRP N210 Potentially Fried

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