I thought the same thing when I first saw it, but reducing the gain doesn't make a difference. At the link below is a screenshot of the result of lowering the TVRX's gain from 30 to 10. The gain is low enough that what I assume is a DC-offset from the ADC can be seen in the center of the plot.
http://img687.imageshack.us/img687/6281/screenshotusrpfft4.png Thomas --- On Mon, 1/11/10, Johnathan Corgan wrote: >From: Johnathan Corgan >Subject: Re: [Discuss-gnuradio] Differences in Signal Spectra between >Daughtercards > > > >On Mon, Jan 11, 2010 at 08:58, Thomas wrote: > >> I'm curious why the spectra of signals received with the TVRX seem to be >> more spread out than with the DBSRX. An example is shown in the link below. >> The upper plot is from the TVRX, and the lower plot is from the DBSRX. This >> signal happens to be an ATSC carrier. Both daughtercards are tuned the same >> frequency, and the FFT parameters and so forth are identical. > >It looks like the gain on the TVRX board is set too high. > >Johnathan >
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