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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: 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
  value of 10.

Principal Investigator
Shirleys Bay Radio Astronomy Consortium

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