I’ve been playing with my USRP2 for a while and last week I noticed a
strange behavior. The early signs were that my USRP2 was deaf so I tried
switch the daughter-board from a WBX to a LFRX and the problem seems to
- When one antenna is connected to RX, the scope is flat with a
fft => -400dB.
- When a -50dBm sine CW is sent to RX, ~=-80dBm (and plenty of
readed by USRP2. Furthermore, the sine wave (on the scope) seems to be
sampled in amplitude.
Looking around on the mailing list i found something about the USRP ADC
fullscale and PGA :
"If you turn the programmable gain amplifier (PGA) down to 0 dB (the
default),then a full-scale signal would be 2 V p-p. If you turn the PGA
to +20dB gain, then full-scale would be .2V p-p"
-Is the USRP2 ADC fullscale/PGA works like USRP1?
-If yes, is it possible to damage the USRP2 ADC if some signal is sent
through a wrong PGA adjustment?
Finally, if my USRP2 is damaged (I’m pretty sure the ADC is toasted)
the way to repair?
Send it back … but where? How do you usually do with damaged