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Re: [Discuss-gnuradio] Question about the FFT

From: B.A.f.H.
Subject: Re: [Discuss-gnuradio] Question about the FFT
Date: Thu, 22 Oct 2009 15:56:06 +0200


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
> _______________________________________________
> Discuss-gnuradio mailing list
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> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio

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