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Re: [Discuss-gnuradio] Losing data during long collects

From: Eric Blossom
Subject: Re: [Discuss-gnuradio] Losing data during long collects
Date: Wed, 4 Jun 2008 21:52:51 -0700
User-agent: Mutt/1.5.17 (2007-11-01)

On Wed, Jun 04, 2008 at 09:33:33PM -0700, Chris Stankevitz wrote:
> Thanks again.  Is it ever possible for all of these things to happen:
> 1. write data to disk using cfile
> 2. hard drive cannot keep up for whatever reason (new sector, etc) and data 
> is lost
> 3. A USRP "overrun" condition does not occur
> Thanks,
> Chris

I can't think of a case when this would happen.

What evidence do you have that data is being dropped?

Can you hook up a siggen and feed a single sinusoid to the USRP rx
daughterboard?  Tune the USRP so that the sinusoid is not at DC in the
complex baseband, and log that data using your program and/or
usrp_rx_cfile.  Then use octave or some other tool to look for
discontinuities in the received signal.

This would allow you to confirm or refute the existence of the
discontinuity using a much less complicated detector than your GPS


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