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Re: [Discuss-gnuradio] always a spike on the FFT at the center frequency


From: Nick Foster
Subject: Re: [Discuss-gnuradio] always a spike on the FFT at the center frequency
Date: Wed, 01 Dec 2010 13:26:32 -0800

On Wed, 2010-12-01 at 16:16 -0500, William Cox wrote:
> Whenever I run the userp_fft.py script (USRP1, Ubuntu 10.04 and
> 10.10), there's almost always a large spike (10-20 db above the noise
> floor) at the center frequency. This is the same for all the daughter
> boards I've tried (WBX, LFRX, and BasicRX).
> Why is this? What am I missing?

DC offset. It's normal. If it's a problem just tune off center so your
frequency of interest isn't at DC.

--n

> Thanks.
> -William
> 
> 
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