Re: [Discuss-gnuradio] Question about the FFT

[B.A.f.H.]

Hi,

in your picture is a peak at -12KHz.

Is it possible, that you have to calculate the absolut value from the FFT?
On a normal calculator it's the function abs().


> Hi all!
> 
> A have a little probleme with FFT.
> 
> I use the GRC without USRP. I would like to messeaure a triangle
> signal, but i never becam the right effect. I attached the picture
> about the measuring.
> 
> The problem are the followed:
> 
> I don't why but, i have allways a peak at 0Hz. - Independent from the
> type of signal
> On the picture i messaure a triangle, but the next peak in the FFT
> failed at 12kHz.
> 
> Attached picture:
> http://img8.imageshack.us/img8/5620/messung5.png
> 
> Have you any Idea?
> 
> Thank: Gergely
> 
> 
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