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| From: | Matt Ettus |
| Subject: | Re: [Discuss-gnuradio] always a spike on the FFT at the center frequency |
| Date: | Thu, 02 Dec 2010 13:34:30 -0800 |
| User-agent: | Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.15) Gecko/20101027 Fedora/3.0.10-1.fc12 Lightning/1.0b2pre Thunderbird/3.0.10 |
On 12/01/2010 01:16 PM, 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?
This is due to truncation in the USRP. If you add 0.5 to the signal, it should go away.
Matt
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