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Re: [Discuss-gnuradio] USRP2 transmission issues

From: nyquist82
Subject: Re: [Discuss-gnuradio] USRP2 transmission issues
Date: Mon, 31 Jan 2011 08:51:16 -0800 (PST)

I do not understand what you mean by "proper" bandwidth. And what are these
"proper" USRP2 `s bandwidth? Thanks anyway for your reply.

Marcus D. Leech wrote:
> 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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> Discuss-gnuradio mailing list
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