Hi, Is it possible to synchronize transmitter and receiver by single LO and also in data sheet,architecture of USRP showing it has separate Local oscillator so main transmit and receive chain LO are derived from main LO or these are separate Local Oscillators? If I want to synchronize one Tx and one Rx channel how can I synchronize from single LO?Its because of architecture diagram I got some confusion Regards Vingnu

Hi Vingnu, what device are we talking about? On the same device, TX and RX LO are derived from the same reference oscillator, so they shouldn't expose a frequency offset, but a random phase after tuning by default. For some devices, you can align phases using timed commands. We have a manual page about this: http://files.ettus.com/manual/page_sync.html If your system is not on that page, then no, your hardware can't do that, and you'll have to estimate phase offset in software, and correct it. Best regards, Marcus On 07.12.2015 06:10, vingnu GNU via USRP-users wrote: > Hi, > Is it possible to synchronize transmitter and receiver by single LO > and also in data sheet,architecture of USRP showing it has separate > Local oscillator so main transmit and receive chain LO are derived > from main LO or these are separate Local Oscillators? > > If I want to synchronize one Tx and one Rx channel how can I > synchronize from single LO?Its because of architecture diagram I got > some confusion > > Regards > Vingnu > > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com

Hi Marcus, My question was on device USRP E310. Regards Vingnu On Mon, Dec 7, 2015 at 2:53 PM, Marcus Müller <usrp-users@lists.ettus.com> wrote: > Hi Vingnu, > > what device are we talking about? > On the same device, TX and RX LO are derived from the same reference > oscillator, so they shouldn't expose a frequency offset, but a random phase > after tuning by default. For some devices, you can align phases using timed > commands. > We have a manual page about this: > http://files.ettus.com/manual/page_sync.html > If your system is not on that page, then no, your hardware can't do that, > and you'll have to estimate phase offset in software, and correct it. > > Best regards, > Marcus > > > On 07.12.2015 06:10, vingnu GNU via USRP-users wrote: > > Hi, > Is it possible to synchronize transmitter and receiver by single LO and > also in data sheet,architecture of USRP showing it has separate Local > oscillator so main transmit and receive chain LO are derived from main LO > or these are separate Local Oscillators? > > If I want to synchronize one Tx and one Rx channel how can I synchronize > from single LO?Its because of architecture diagram I got some confusion > > Regards > Vingnu > > > _______________________________________________ > USRP-users mailing listUSRP-users@lists.ettus.comhttp://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > > > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > >

 Hi Vingnu,

 what device are we talking about?
 On the same device, TX and RX LO are derived from the same
 reference oscillator, so they shouldn't expose a frequency offset,
 but a random phase after tuning by default. For some devices, you
 can align phases using timed commands.
 We have a manual page about this:
 http://files.ettus.com/manual/page_sync.html
 If your system is not on that page, then no, your hardware can't
 do that, and you'll have to estimate phase offset in software, and
 correct it.

 Best regards,
 Marcus


 On 07.12.2015 06:10, vingnu GNU via USRP-users wrote:

 Hi,
 Is it possible to synchronize   transmitter and receiver by
 single LO and also in data sheet,architecture of USRP showing it
 has separate Local oscillator so main transmit and receive chain
 LO are derived from main LO or these are separate Local Oscillators?

 If I want to synchronize one Tx and one Rx channel how can I
 synchronize from single LO?Its because of architecture diagram I
 got some confusion

 Regards
 Vingnu


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 USRP-users mailing list
 USRP-users@lists.ettus.com <mailto:USRP-users@lists.ettus.com>
 http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com

 _______________________________________________
 USRP-users mailing list
 USRP-users@lists.ettus.com <mailto:USRP-users@lists.ettus.com>
 http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com

There's no way to phase-sync the TX and RX LOs on the E310, but they are inherently frequency synced, so a simple cross-correlation timing offset estimator should do the trick. Best regards, Marcus On 07.12.2015 10:56, vingnu GNU wrote: > Hi Marcus, > > My question was on device USRP E310. > > > Regards > Vingnu > > On Mon, Dec 7, 2015 at 2:53 PM, Marcus Müller > <usrp-users@lists.ettus.com <mailto:usrp-users@lists.ettus.com>> wrote: > > Hi Vingnu, > > what device are we talking about? > On the same device, TX and RX LO are derived from the same > reference oscillator, so they shouldn't expose a frequency offset, > but a random phase after tuning by default. For some devices, you > can align phases using timed commands. > We have a manual page about this: > http://files.ettus.com/manual/page_sync.html > If your system is not on that page, then no, your hardware can't > do that, and you'll have to estimate phase offset in software, and > correct it. > > Best regards, > Marcus > > > On 07.12.2015 06:10, vingnu GNU via USRP-users wrote: >> Hi, >> Is it possible to synchronize transmitter and receiver by >> single LO and also in data sheet,architecture of USRP showing it >> has separate Local oscillator so main transmit and receive chain >> LO are derived from main LO or these are separate Local Oscillators? >> >> If I want to synchronize one Tx and one Rx channel how can I >> synchronize from single LO?Its because of architecture diagram I >> got some confusion >> >> Regards >> Vingnu >> >> >> _______________________________________________ >> USRP-users mailing list >> USRP-users@lists.ettus.com <mailto:USRP-users@lists.ettus.com> >> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com <mailto:USRP-users@lists.ettus.com> > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > >