On Thu, Jun 5, 2014 at 4:37 AM, jason sam <user0...@gmail.com> wrote:
> ok.Then how can i achieve FM for greater deviation.i.e. in MHz range in > GRC? > What you're seeing is a result of the Remez algorithm in the optfir module not properly converging. Why isn't always clear; you can either tighten up or loosen the demands on the filter being built to try and fix it. You could also go into the code and replace the optfir call with firdes. The resulting filter might not be as good as you want and more taps, but it will at least always build. Tom > On Thu, Jun 5, 2014 at 1:18 PM, Marcus Müller <marcus.muel...@ettus.com> > wrote: > >> Given your question, I think you already know the answer. 2MHz is far >> from audio. Please refer to the wbfm example in GNU Radio, which has sane >> parameters. >> >> Greetings, >> Marcus >> >> On 05.06.2014 09:58, jason sam wrote: >> >> Hi All, >> I am doing simple wide band FM..The flowgraph is as attached..When i >> execute it i am getting following error: >> >> gr_remez: insufficient extremals -- cannot continue >> Traceback (most recent call last): >> File "/home/ali/Desktop/top_block.py", line 109, in <module> >> tb = top_block() >> File "/home/ali/Desktop/top_block.py", line 75, in __init__ >> max_dev=4000000, >> File "/usr/local/lib/python2.7/dist-packages/gnuradio/analog/wfm_tx.py", >> line 69, in __init__ >> 40) # stopband atten dB >> File "/usr/local/lib/python2.7/dist-packages/gnuradio/filter/optfir.py", >> line 55, in low_pass >> taps = filter.pm_remez (n + nextra_taps, fo, ao, w, "bandpass") >> File >> "/usr/local/lib/python2.7/dist-packages/gnuradio/filter/filter_swig.py", >> line 466, in pm_remez >> return _filter_swig.pm_remez(*args, **kwargs) >> RuntimeError: gr_remez: insufficient extremals -- cannot continue >> >> Is the quadrature rate and audio rate are high? >> >> >> >> >> _______________________________________________ >> Discuss-gnuradio mailing >> listDiscuss-gnuradio@gnu.orghttps://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
