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Re: [Discuss-gnuradio] Questions on the usrp_fft and usrp_oscope

From: John Clark
Subject: Re: [Discuss-gnuradio] Questions on the usrp_fft and usrp_oscope
Date: Tue, 05 Apr 2005 09:52:31 -0700
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.8a6) Gecko/20050111

Sachi wrote:

Hi, guys

I met some confusions when I tried the usrp_fft and

I generate a 2MHz, peak to peak 1V, sin wave using the
Agilent signal generator, and connect it to usrp.
However, the result of usrp_fft always shows a very
strong component at DC, besides the 2MHz. Why is that?

As I recall the FT transforms a 'constant' function into a single point at the
origin, suggesting that your 2Mhz signal is offset from 'zero', either by
an error in the signal generator setup, or in the analog portion of the

(I don't have things setup to test with a known data set... )

John Clark

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