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Re: [Discuss-gnuradio] DBSRX coherent problem (Phase Noise)

From: tom_wgs
Subject: Re: [Discuss-gnuradio] DBSRX coherent problem (Phase Noise)
Date: Fri, 12 Nov 2010 11:28:17 -0800 (PST)

Matt Ettus wrote:
> On 11/12/2010 08:32 AM, tom_wgs wrote:
>> Hi all
>> What phase noise improvements are seen in the new DBSRX2 daughter boards?
> The DBSRX2 has much better close in phase noise, so it will improve on 
> this.  However, I think what you are seeing with the original DBSRX 
> should look better than that.  Can you do an FFT of each input signal 
> and send a link to them?  I think you might see a lot more noise on one 
> than the other, indicating a problem with one board.
> Matt
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Attached are 2 FFT plots one for each of the receivers. The plots are of
the same data used to create previous images.


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