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Re: [Discuss-gnuradio] USRP2 transmission issues

From: Marcus D. Leech
Subject: Re: [Discuss-gnuradio] USRP2 transmission issues
Date: Mon, 31 Jan 2011 10:09:46 -0500
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.15) Gecko/20101027 Fedora/3.0.10-1.fc12 Thunderbird/3.0.10 
On 01/31/2011 09:35 AM, nyquist82 wrote:
>
> Hy Matt, I know the Nyquist theorem :-D , but here the problem is not as
> simple as that. The problem is that changing the interpolation, the
> bandwidth of the signal sent by USRP2 and displayed on spectrum analyzer
> does not change. Not only that, the displayed signal is not stable at all.
>
> I tried everything but the result is always the same. Please help me. :-(
>
> Bye!!
>   
You said that your recording is at 8MHz bandwidth (8Msps complex).  Since
  8Msps isn't a "proper" bandwidth for the USRP2, you'll have to up-sample
  to a proper (10MHz) rate before you send it to the USRP2, and select
  the appropriate interpolation ratio.  You'd have to specify an
interpolation
  value of 10.





-- 
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
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