On 02/24/2012 02:45 PM, Rafael Diniz wrote: > It would be nice, but it could be fixed up and converted to cmake in the > current svn repo also...
But most of us have forgotten how to use subversion :) Philip > > > >> 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 > _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
