Re: [Discuss-gnuradio] Question about the FFT

[Josh Blum]

Kóczián Gergely wrote:
> 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

The imaginary part of your signal has a dc offset.

> On the picture i messaure a triangle, but the next peak in the FFT
> failed at 12kHz.

Try making it a real signal (float outputs, not complex outputs).

> Attached picture:
> http://img8.imageshack.us/img8/5620/messung5.png
>
> Have you any Idea?
>
> Thank: Gergely
>
>
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