On Mon, Mar 28, 2011 at 3:23 PM, Marcin Szelest
<address@hidden> wrote:
Hello,
I have created FM transmitter in GRC:
http://szelest.org/question/TX_RX.grc.png
Unfortunately demodulated audio has poor quality and annoying
distortions. I have spent a lot of time on it without positive effect.
Here is how demodulated audio sounds like:
http://szelest.org/question/recorded.wav
When I have created FM receiver in GRC (bottom part of the schematic),
demodulated audio sounds perfectly on my PC.
Any ideas?
I'm using gnuradio3.3.0 + USRP2(with interpolation changed from 4 to
2) + BasicTX + FT857D as hardware receiver.
GRC file: http://szelest.org/question/TX_RX.grc
input WAV: http://szelest.org/question/indiana.wav
Regards,
Marcin SQ9DJJ
You almost certainly have the sample rate set incorrectly somewhere. For instance, when I play the file, it tells me it's a 22050 Hz WAV file, so something is probably set incorrectly.
Tom