Re: AM demodulation

[Barry Duggan]

Hi Albin and Volker,

I added a PLL Carrier Tracking block to take care of the tuning problem. 
See the revised https://wiki.gnuradio.org/index.php/File:FunCube_AM.png

Albin, that 'spike' is the carrier! This is AM ;)

Thank you both for your suggestions.
---
Barry Duggan KV4FV


On 2019-10-27 07:13, Albin Stigö wrote:
> Hi Barry,
>
> Some thoughts:
>
> You have a large DC spike at the center, try using the frequency 
> xlating
> fir filter to tune an offset frequency.
>
> Why don't you decimate at the channel filter?
>
> Try observing the signal at various points using the frequency sink.
>
> Good luck,
> Albin SM6WJM
>
> On Sat, Oct 26, 2019, 21:02 Barry Duggan <address@hidden> wrote:
>
> > Hi,
> >
> > I've been working on a gnuradio AM broadcast receiver, and have found
> > that the tuning is very critical to obtaining clear audio. My 
> > flowgraph
> > can be seen at 
> > https://wiki.gnuradio.org/index.php/File:FunCube_AM.png.
> > Are there any alternate demodulation methods which are not so 
> > sensitive
> > to exact tuning?
> >
> > Thanks,
> > --
> > Barry Duggan KV4FV