Thanks for the quick response!  Can you provide more details to your statement?

Thanks

Mark

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________________________________
From: ROBIN TORTORA <ti...@comcast.net>
Sent: Monday, December 4, 2017 5:57:44 PM
To: Mark Koenig; Mark Koenig via USRP-users
Subject: Re: [USRP-users] Decrease in SNR seen with X310


The LO feed through on the UBX is wicked high...


Offset tuning helps alot...

On December 4, 2017 at 4:43 PM Mark Koenig via USRP-users 
<usrp-users@lists.ettus.com> wrote:


I have been collecting signals in a lab environment using an N210 with a CBX 
card without any perceived issues.  When running the uhd_fft script I am seeing 
an SNR of 20-30 dB, which is enough for me to do the post processing of the 
collected signals.



When I upgraded to the X310 with UBX40 cards I noticed a much higher noise 
floor and a decrease in SNR ~10dB.  This decrease in SNR makes it unable for me 
to post process the signals.



I am operating in Rx mode only.



Does anyone have any thoughts as to what might be going on?



Thank you



Mark



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