On 09/26/2012 01:36 AM, LD Zhang wrote: > Hi, > > I did try and made a GRC example of using a USRP Source and a fft sink, > scope sink, and a file sink to test out the idea. > > When looking at the scope sink, the data is about +/- 2x10^-4. I changed > the gain of the USRP source block to 20 dB. But nothing happened to the > signal amplitude. How is this possible? >
You mentioned LFRX? There are no configurable gain elements for the LFRX daughterboard. If this helps, the various gain ranges are listed for various daughterboard frontends here: http://files.ettus.com/uhd_docs/manual/html/dboards.html#basic-rx-and-lfrx -josh > Please see the attached GRC if you want to see what I am doing. Thanks. > > LD > >> I could go directly to GRC GUI directly and try to learn to do everything >>> there. But I think there is value in being able to do this simple thing >>> from the command line. Your help and suggestions are appreciated. >>> >> >> I will second this motion. >> >> All of the hooks are available in the USRP source block, most of which >> can be changed at runtime with a simple variable widget. Its nice to >> change setting at runtime to see the effect. >> >> Also, you can easily attach a file sink and a scope sink and an fft >> sink. That way you know that you have captured to file the same thing >> you are observing. >> >> Also, be careful with the format of the file data. Its a binary array of >> std::complex<float>, not float, not double, etc... >> >> -josh >> >> >> _______________________________________________ >> Discuss-gnuradio mailing list >> Discuss-gnuradio@gnu.org >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> > _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
