On Tue, Feb 19, 2008 at 01:59:45PM +0100, Per Zetterberg wrote:
> 
> Dear All,
> 
> I am trying to send a square-wave from the USRP DAC (basic TX board). I have
> made the the following little C++ program - but it gives me underruns
> whenever I set the interpolation factor less than 64. Any help is
> appreciated!
> 
> BR/
> Per Zetterberg

What kind of machine and OS are you running this on?

What FUSB_TECH is configure choosing?
You can find this out by grepping a Makefile for FUSB_TECH.  E.g., 

[EMAIL PROTECTED] gnuradio-core]$ grep FUSB_TECH Makefile
FUSB_TECH = linux

Eric


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