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RE: [Discuss-gnuradio] USRP2 PPS and REF

From: Newman, Timothy
Subject: RE: [Discuss-gnuradio] USRP2 PPS and REF
Date: Fri, 13 Feb 2009 14:04:46 -0500

Couldn't you just tell the USRP's to start at a specific time to get
them to start in sync?  Rather than in real-time telling them to start
immediately and having that lag.


Timothy R. Newman, Ph.D.
Wireless @ Virginia Tech
447 Durham Hall
Blacksburg, VA 24061
Phone: 540-231-2041

> -----Original Message-----
> From: address@hidden
> address@hidden On Behalf Of Douglas Geiger
> Sent: Friday, February 13, 2009 2:02 PM
> To: address@hidden
> Subject: Re: [Discuss-gnuradio] USRP2 PPS and REF
>  Ok - so I have packets coming in from both USRP2's now, getting
> to their separate files.
>  My app prints out the timestamp of each frame that gets sent to the
> copy handler: if my 1PPS source is working properly, should the
> timestamps coming out of the two USRP2's be identical?
>  Another question: no matter what, there is going to be some time
> between when I tell one USRP2 to start, and when I tell the other one
> start: with the timestamps I could do something like
> align_on_samplenumbers (but with the timestamps - at least I could do
> this in the copy handler where I have access to this information). Of
> course this requires that the timestamps do end up being based on the
> 1PPS. Should I take that as a sign my USRP2's are not currently
> sync'd to the 1PPS?
>  Thanks,
>  Doug
> --
> Doug Geiger
> Research Assistant
> Communications and Signal Processing Lab
> Oklahoma State University
> http://cspl.okstate.edu
> address@hidden
> address@hidden
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