Ok, thanks, One more question... So does that mean we control the NCO from the software?
I will have a look at those blocks. thanks, -Sam --- On Wed, 9/1/10, Tom Rondeau <trondeau1...@gmail.com> wrote: From: Tom Rondeau <trondeau1...@gmail.com> Subject: Re: [Discuss-gnuradio] Newbie question on USRP2, synchronization done by the FPGA?, To: "Sam Keene" <samke...@yahoo.com> Cc: discuss-gnuradio@gnu.org Date: Wednesday, September 1, 2010, 9:03 PM On Wed, Sep 1, 2010 at 8:52 PM, Sam Keene <samke...@yahoo.com> wrote: Hi, Thanks for the reply. I guess I am just trying to better understand this diagram: http://www.linuxjournal.com/files/linuxjournal.com/linuxjournal/articles/073/7319/7319f3.inline.jpg I understand what the decimating filters are doing, but I'm a little unclear about the NCO. Does this component phase and frequency lock for me, or will I have to code that myself? thanks, -Sam No, there is no freq/phase lock in the USRP/USRP2. We have to do this in software. You can reference the dbpsk and dqpsk blocks that we have already written or the newer dbpsk2/dqpsk2 blocks that use newer techniques for the phase, frequency, and timing locks. Tom
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