If there's no filter inside "WBFM Receive PLL", place one before it. The example in gr-uhd has a 400 kHz filter there.
On Tue, Jun 16, 2020 at 8:46 PM Barry Duggan <ba...@dcsmail.net> wrote: > Hi, > > I have a broadcast FM (mono) receiver which works well, with good audio > and clean traces in the Time Domain. See > https://wiki.gnuradio.org/index.php/File:USRP_FM_fg.png > > Then I made a stereo version. See > https://wiki.gnuradio.org/index.php/File:USRP_FM_stereo_fg.png Using > it, the sound has a distortion but does not have any audio underruns. > The traces in the Time Domain have a lot of "fuzz" (noise?). > > Do I need a filter? If so, would it come before or after the WBFM > Receive PLL block? > > Once I have a good design, I will use it as an Example Flowgraph. > > Thanks for your help. > -- > Barry Duggan KV4FV > >
