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Re: [Discuss-gnuradio] Some Basic USRP questions

From: Dimitris Symeonidis
Subject: Re: [Discuss-gnuradio] Some Basic USRP questions
Date: Mon, 6 Apr 2009 21:06:28 +0200

1) uO means usrp overrun, i.e. the usrp had more data to send, but the
host computer was not fast enough to accept it and calculate it, so it
was dropped. setting the decimation rate to its maximum value does
decrease the processing load on your cpu, but on old systems or very
"heavy" flowgraphs your cpu might still be overloaded. try closing any
other programs running (e.g. don't watch youtube videos at the same

2) no, the decimation and interpolation rates don't need to be equal,
but their combined values need to not saturate the usb 2.0 bus

Dimitris Symeonidis
"If you think you're too small to make a difference, try sleeping with
a mosquito!" - Amnesty International

On Mon, Apr 6, 2009 at 20:14,  <address@hidden> wrote:
> Hi,
> I have a few basic USRP questions. I have gone through the mail archive
> and USRP wiki page but could not find answer to them.
> 1) When I run my scripts I sometimes get "uOuOuO" message. I read in the
> archives that I need to increase the decimation rate but I have already
> set it to the maximum limit of 256. What should I do? Also, why do I not
> get the message all the time?
> 2) When configuring the USRP Tx and Rx, is it necessary that the
> interpolation and decimation rates should be the same?
> thanks and regards,
> -Sumit Satarkar
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> Discuss-gnuradio mailing list
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