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

[tom_wgs]

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.

http://old.nabble.com/file/p30202581/fft_reciever-A.jpg 
http://old.nabble.com/file/p30202581/fft_reciever-B.jpg 

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