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Re: [Discuss-gnuradio] USRP2 1pps synchronization delay

From: Josh Blum
Subject: Re: [Discuss-gnuradio] USRP2 1pps synchronization delay
Date: Sat, 25 Sep 2010 21:49:10 -0700
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20100915 Thunderbird/3.0.8

Does this describe what you are seeing?


On 09/25/2010 08:50 PM, Kelley, Clifford W wrote:

We are trying to determine how much delay there is between the 1pps pulse and 
when the samples come out properly time tagged.  Using a GPS timing receiver we 
connected up the 10MHz clock and 1pps to the USRP2.  The software is set up to 
reset on the next 1pps pulse.  With a GPS software receiver we determined that 
there is a delay of 3 - 6 microseconds which curiously was 3 with a smaller 
decimation and 6 at a higher decimation.  We've checked over the setup and 
can't find any reason for this.  Does anyone have any ideas?



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