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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