It would be nice, but it could be fixed up and converted to cmake in the current svn repo also...
> The CGRAN RDS code seems abandoned, I'm thinking about cloning it to > github so it can be converted to UHD and Cmake and fixed up. > > On Fri, Feb 24, 2012 at 1:31 PM, <mle...@ripnet.com> wrote: >> I don't know about having it inside the main codebase, but converting it >> to >> use the CMake build system would be good, since it didn't really >> understand >> how to place its python files into a filesystem that uses >> /usr/local/lib64--so I had to move them manually. >> >> -Marcus >> >> >> >> On Fri, 24 Feb 2012 10:23:48 -0800, Rafael Diniz wrote: >> >> It would be great to have the rds code inside the gnuradio tree instead >> of >> in a separate cgran project! >> ; ) >> >> I don't know why, but when I tried the cgran rds code, the grc example >> worked much better then the python one. >> >> Best regards, >> Rafael Diniz >> >> >> >> Actually, I'm using the blks2 WBFM block, which I believe is a PLL >> demodulator. >> >> Both of my "test" stations are actually roughly 100km >> away from me, broadcasting from a high point in the Ottawa Valley. >> >> One >> station comes in about 10dB stronger than the other, although both have >> an ERP of about 100kW, and both are located on the same transmit tower. >> >> >> I'll send you my 'stuff' once I'm more comfortable with it. The audio >> quality is actually reasonably good, so I think the FM demodulator >> portion is just fine. >> >> -Marcus >> >> On Fri, 24 Feb 2012 11:12:28 -0500, >> Andrew Davis wrote: >> >> I think the problems with SNR is with the FM >> >> Demod, my car stereo can >> >> get RDS as the station fades 40 miles away, >> >> but with my USRP has >> >> trouble picking up the stereo pilot from a 50kw >> >> station one mile away >> >> ( -10dBm ). FM demod is hard for software ( I >> >> think GNUradio just uses >> >> a zero-crossing detector ). >> >> Do you have >> >> the code, I would love to test it. >> >> On Thu, Feb 23, 2012 at 11:33 >> >> PM, Marcus D. Leech wrote: >> >> I managed to get gr-rds built tonight, and >> >> was able to test it planted inside my FM receiver. Even for a local >> station, there are *lots* of errors, and more distant stations get even >> more. I'm going to play around a bit with filter bandwidths, etc, to see >> if I can improve it. Looking at the modulation technique, it's no big >> surprise--they use a bi-phase baseband coding (basically like >> differential Manchester), that drives a DSB-SC modulator with a carrier >> at 57kHz. But that signal is generally about 20dB below the other audio >> sub-channels on the FM demodulator output. So the SNR is generally >> *terrible*. I'm rather surprised, after looking at it, that anyone >> bother deploying RDS. It seems utterly crappy. It's generally broadcast >> with fairly-low SNR, and there's no FEC built in, only CRC. I re-jigged >> the XML for the demodulator part so you can reset the demodulator state >> machine from within a GRC flow-graph (there was a reset() method on the >> demod, but it wasn't exposed within the XML framework for GRC). Also, I >> may re-jig the decoder portion--it currently injects decoded frames into >> a message queue and to stdout. Might be useful to do other things with >> those messages. Like is there a simple way to have a message dequeuer >> within a GRC flow-graph so that one could stuff messages into a >> variable? -- Principal Investigator Shirleys Bay Radio Astronomy >> Consortium http://www.sbrac.org [1] >> _______________________________________________ Discuss-gnuradio mailing >> list Discuss-gnuradio@gnu.org [2] >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio [3] >> >> >> >> >> Links: >> ------ >> [1] http://www.sbrac.org >> [2] >> mailto:Discuss-gnuradio@gnu.org >> [3] >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> [4] >> mailto:mle...@ripnet.com >> _______________________________________________ >> 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 >> >> >> >> >> _______________________________________________ >> 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 > _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
