[Discuss-gnuradio] GRC + USRP2 + WBFM: synchronization problem?

[Marcin Szelest]

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