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Re: [Discuss-gnuradio] Question about the FFT

From: Josh Blum
Subject: Re: [Discuss-gnuradio] Question about the FFT
Date: Thu, 22 Oct 2009 08:43:03 -0700
User-agent: Thunderbird (X11/20090817)

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:

Have you any Idea?

Thank: Gergely

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