Re: FM stereo receiver distortion

Hi James and others,

Success! Using the code from
https://github.com/gnuradio/gnuradio/blob/master/gr-analog/python/analog/wfm_rcv_fmdet.py
with several modifications, I built a FM stereo receiver using only
basic blocks. See the revised
https://wiki.gnuradio.org/index.php/File:USRP_FM_stereo_fg.png

Thank you for everyone's help / suggestions.
---
Barry Duggan KV4FV


On 2020-06-17 01:11, James Hayek wrote:
> Evening Barry, I'll put this on my to do list tomorrow morning for the
> Pluto.
>
> On Tue, Jun 16, 2020 at 8:45 PM Barry Duggan <barry@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
>>
>>
>
> --
> Thanks,
> James G Hayek
> Youtube.com/JamesHayek