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Re: [Discuss-gnuradio] Unexplained out-of-sequence packets...

From: Marcus D. Leech
Subject: Re: [Discuss-gnuradio] Unexplained out-of-sequence packets...
Date: Mon, 10 May 2010 20:28:32 -0400
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20100330 Fedora/3.0.4-1.fc12 Thunderbird/3.0.4

> Typically, if you can't keep up at a slow decimation, going to a
> faster one would make things worse, not better.  The only thing I can
> think of to explain what you are seeing is that you might be doing a
> lot more processing at the lower rate.  For example, at the lower
> sample rate, you might be making your filter transition bands very
> narrow, resulting in very long filters.
> Matt
I've run into that problem (in a different context--not with USRP2). If
you make your filter transition bandwidth
  some fraction of the overall bandwidth of the filter, you can end up
with longish filters and lower bandwidths.

I was used to using an expression like (filter_bandwidth/10) for the
transition bands, but that ends up with
  quite long filters.

Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium

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