Thank you so much again Josh 
So Josh could you give me some opinion 
That
 if my input signal pass through the USRP is about cos(wt+phi) after it 
passed through the mixer by NCO that generate sinwt and coswt  and met 
with the cic filter inside the usrp

what my professor expect is 
the output that go out of the usrp must be the constant value cosphi and
 sinphi so if we connect to usrp with the scope sink, what we would see 
is the DC graph of the cosphi and sinphi values  but what we notice for 
real was the scope showed the graph that seems to have cycles.So what do
 you think?
but if what i aspect is wrong . SO how can i find the PHI of the input signal?

Thank you very very much for yours advice
Wipat

sorry for my english too.                                         
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