FM Transmitter Matlab By HackRF One Sink Problem

[stackprogramer]

@skoslowski
in before we can receive fm signal with source hackrf one,but for TX we have problems......

link FM transmitter stereo Simulink matlab
https://drive.google.com/open?id=0Bxkt-d32S34gS2dlbWM2SnB4QU0

link FM transmitter mono simulink matlab
https://drive.google.com/open?id=0Bxkt-d32S34geWROUGFfNjREWjA

you can see that in below video FM spectrum can be seen on GQRX, but we can not play sound in FM receiver we only has a loud noise sound......
after close sink hackrf one noise sound is destroyed.........
https://www.youtube.com/watch?v=uFoxhOOuJa4

why we can not transmit FM with this sink, other hand for USRP too we not have any FM transmitter......
any idea....
thanks