On 08/18/2010 01:41 PM, David Evans wrote: > Hi, > > GRC Setup (used with RFX and WBX cards)... > > USRP1 ---to---> FFT Graphical sink (shows signal spectrum as expected) > and ---to---> Complex to IShort -----to----> File Sink (signals are > dumped > to disk as expected) > > USRP2 ---to---> FFT Graphical sink (shows signal spectrum as expected) > and ---to---> Complex to IShort ----to----> File Sink (******file is > all > zeros******) > > Tried with 3.3.0 and git 3.3.1, and on three different installations/USRPs. > Basically zero output with USRP2. > USRP2 works fine with python scripts eg, usrp2_fft.py with --output-shorts. > > Any ideas please? > > Dave > > My guess is that with USRP2, samples are scaled -1.0 to 1.0. Which means that a straight conversion to a short integer is going to yield zero most of the time. Try putting a multiplier block in front of your file sink--maybe scale those -1.0 to +1.0 to +/- 32767.
-- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
