Re: [USRP-users] Phase drift issue of N310

2019-03-14 Thread Piotr Krysik via USRP-users
Hi Ali, The daughterboards have their own clock generators, but they are not exactly 'independent'. At least they don't have to be, as they share the same reference clock. Look at the block diagram: https://kb.ettus.com/images/9/9d/USRP_N310_N300_DB_Schematic.pdf and "Ref Clock" block. I don't h

Re: [USRP-users] Phase after Freq Hopping

2019-03-14 Thread Marcus Müller via USRP-users
That kind would be cool ;) . But: since this is radar, the reason for all this is probably exceeding the Nyquist bw of the DAC with the radar wave form :( Cheers, Marcus On Tue, 2019-03-12 at 23:49 -0700, Ian Buckley via USRP-users wrote: > > On Mar 12, 2019, at 3:05 PM, Marcus D. Leech via USRP-

Re: [USRP-users] Phase drift issue of N310

2019-03-14 Thread Marcus D. Leech via USRP-users
On 03/14/2019 03:56 AM, Piotr Krysik via USRP-users wrote: Hi Ali, The daughterboards have their own clock generators, but they are not exactly 'independent'. At least they don't have to be, as they share the same reference clock. Look at the block diagram: https://kb.ettus.com/images/9/9d/USRP

Re: [USRP-users] Phase after Freq Hopping

2019-03-14 Thread Sylvain Munaut via USRP-users
Hi, integer-N tuning maybe ? And use the DDC/DUC for the rest ? Cheers, Sylvain ___ USRP-users mailing list USRP-users@lists.ettus.com http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com

Re: [USRP-users] Phase after Freq Hopping

2019-03-14 Thread Marcus D Leech via USRP-users
I think it depends on what is meant by the “same phase as last time”. Relative to what? Sent from my iPhone > On Mar 14, 2019, at 10:17 AM, Sylvain Munaut <246...@gmail.com> wrote: > > Hi, > > integer-N tuning maybe ? > And use the DDC/DUC for the rest ? > > Cheers, > > Sylvain

Re: [USRP-users] Phase drift issue of N310

2019-03-14 Thread Damon via USRP-users
Hi Marcus, The UHD Version is v3.14.0.0-rc1. Best regards, Damon Hi Ali, The daughterboards have their own clock generators, but they are not exactly 'independent'. At least they don't have to be, as they share the same reference clock. Look at the block diagram: https://kb.ettus.com/images

Re: [USRP-users] Phase drift issue of N310

2019-03-14 Thread Ali Dormiani via USRP-users
Hello all, Sorry for spreading misinformation. I frequently conflate clock and LO incorrectly. Additionally the results I posted are for an array of multiple N310's which definitely have different clocks. I was taught in class that carrier frequency offset happens when an access point (AP) and cl

Re: [USRP-users] Phase drift issue of N310

2019-03-14 Thread Marcus D. Leech via USRP-users
On 03/14/2019 05:07 PM, Ali Dormiani via USRP-users wrote: Hello all, Sorry for spreading misinformation. I frequently conflate clock and LO incorrectly. Additionally the results I posted are for an array of multiple N310's which definitely have different clocks. I was taught in class that c