Spectrum Scope in Matlab for the received data

Hi guys,

I am trying to use the USRP1 to see the spectrum in 2.4GHz(ISM band). I am trying to use the mex files(available on the websites) for transmission of the data. the Data is as follows Basic = kron(ones(5e5/10/2/4,1),[ones(10,1);-ones(10,1)]); Vide = zeros(125000,1); Base = [Basic;Vide]; Data = kron(ones(20,1),Base);

This is transmitted at central frequency of 2.4GHz of 500kHz channel. I receive the data and plot it using Te = (1:length(Data))/(500e3); plot(Te,real(Data));

But I wish to see the spectrum , a 500kHz channel at central frequency of 2.4GHz? I have tried the fft and Nfft but it is not showing the expected spectrum?

Can you please suggest how to go around it?

Cheers