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 <[email protected]> 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
