Want to record Fm samples

Hello,
I want to record a FM sample that I am receiving from my USRP.I have
attached a file_sink block in the grc to the fm receiver
simulation.The file extension that I am using is .dat.When I convert
this
.dat file to mp3 using sox or lame,my sample is highly degraded than the
sample I can hear form the Fm receiver.Can someone suggest to me how to
save
samples without degradation.?

Thanks for your help
Mayur

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