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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 usrp_oscope. 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 A/D. (I don't have things setup to test with a known data set... ) John Clark
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