Hi I would like to follow up this conversation. Is it possible to have a constant initial phase offset for every run when power is up? I knew the B210 can remains constant phase offset across two receivers during the operation. However, the challenge for me is that whenever power is up, the initial phase across devices is not constant. Namely, the first run v.s. the second run will have different phase offset across two receiver even though I feed into the same single frequency tone through the power-splitter. Is there anyway we can fix this thing? Thanks! All Best, Jack On Fri, Jul 13, 2018 at 8:05 PM, Jack Yang <ccjack@uw.edu> wrote: > Hi I would like to follow up this conversation. Is it possible to have a > constant initial phase offset for every run when power is up? > I knew the B210 can remains constant phase offset across two receivers > during the operation. However, the challenge for me is that whenever power > is up, the initial phase across devices is not constant. Namely, the first > run v.s. the second run will have different phase offset across two > receiver even though I feed into the same single frequency tone through the > power-splitter. Is there anyway we can fix this thing? > > Thanks! > > All Best, > Jack > > > On Tue, Mar 24, 2015 at 2:38 PM, Ufuk Tamer via USRP-users < > usrp-users@lists.ettus.com> wrote: > >> I am using the block in default settings so time sync part is in default. >> >> On 24.3.2015 23:20, Marcus D. Leech wrote: >> >> On 03/24/2015 05:18 PM, Ufuk Tamer wrote: >> >> I am using the latest version. I have a simple GRC flow graph that takes >> two channel I&Q data and then processing this data in Octave. And every >> time I turn on the receiver (tx & rx locations are fixed), I get different >> phase offset between two rx channels. >> >> In order to apply direction of arrival (DOA) technique, I have to first >> use a reference signal to detect this random phase offset, remove it and >> then estimate the angle of transmitter. >> >> What are you using for time-synch in the UHD source block? >> >> >> On 24.3.2015 22:12, Marcus D. Leech via USRP-users wrote: >> >> On 03/24/2015 03:12 PM, Ufuk Tamer via USRP-users wrote: >> >> Dear all, >> >> I am testing the phase offset between two Rx channels of B210. For this >> case, I transmit a sine signal with another USRP device and receive it with >> two RX channels of B210. Then I calculate the phase offset between >> channels. The problem is the phase offset changes whenever I reset the >> receiver. So it gives a random phase offset on each device turn on. >> >> Is this normal? If yes, what is the reason for this random phase offset. >> Since both channels share the same LO, where this "random" phase offset >> come from? >> >> Thank you... >> >> ------------------------------ >> >> *Ufuk Tamer * >> >> What version of UHD are you using? >> >> How are you doing the two-channel receive? >> >> >> >> >> >> _______________________________________________ >> USRP-users mailing listUSRP-users@lists.ettus.comhttp://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >> >> >> ------------------------------ >> *Ufuk* >> >> >> >> ------------------------------ >> *Ufuk * >> >> _______________________________________________ >> USRP-users mailing list >> USRP-users@lists.ettus.com >> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >> >> >

 Hi I would like to follow up this conversation. Is it possible to
 have a constant initial phase offset for every run when power is up?
 I knew the B210 can remains constant phase offset across two
 receivers during the operation. However, the challenge for me is
 that whenever power is up, the initial phase across devices is not
 constant. Namely, the first run  v.s. the second run will have
 different phase offset across two receiver even though I feed into
 the same single frequency tone through the power-splitter. Is
 there anyway we can fix this thing?

 Thanks!

 All Best,
 Jack


 On Tue, Mar 24, 2015 at 2:38 PM, Ufuk Tamer via USRP-users
 <usrp-users@lists.ettus.com <mailto:usrp-users@lists.ettus.com>>
 wrote:

     I am using the block in default settings so time sync part is
     in default.

     On 24.3.2015 23:20, Marcus D. Leech wrote:

     On 03/24/2015 05:18 PM, Ufuk Tamer wrote:

     I am using the latest version. I have a simple GRC flow
     graph that takes two channel I&Q data and then processing
     this data in Octave. And every time I turn on the receiver
     (tx & rx  locations are fixed), I get different phase offset
     between two rx channels.

     In order to apply direction of arrival (DOA) technique, I
     have to first use a reference signal to detect this random
     phase offset, remove it and then estimate the angle of
     transmitter.

     What are you using for time-synch in the UHD source block?

     On 24.3.2015 22:12, Marcus D. Leech via USRP-users wrote:

     On 03/24/2015 03:12 PM, Ufuk Tamer via USRP-users wrote:

     Dear all,

     I am testing the phase offset between two Rx channels of
     B210. For this case, I transmit a sine signal with another
     USRP device and receive it with two RX channels of B210.
     Then I calculate the phase offset between channels. The
     problem is the phase offset changes whenever I reset the
     receiver. So it gives a random phase offset on each device
     turn on.

     Is this normal? If yes, what is the reason for this random
     phase offset. Since both channels share the same LO, where
     this "random" phase offset come from?

     Thank you...

     ------------------------------------------------------------------------
     /*Ufuk Tamer
     */

     What version of UHD are you using?

     How are you doing the two-channel receive?





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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  <http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com>

     ------------------------------------------------------------------------
     /*Ufuk*/

     ------------------------------------------------------------------------
     /*Ufuk */

     _______________________________________________
     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
     <http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com>

On 07/13/2018 11:28 PM, Jack Yang wrote: > Hi I would like to follow up this conversation. Is it possible to have > a constant initial phase offset for every run when power is up? > I knew the B210 can remains constant phase offset across two receivers > during the operation. However, the challenge for me is that whenever > power is up, the initial phase across devices is not constant. Namely, > the first run v.s. the second run will have different phase offset > across two receiver even though I feed into the same single frequency > tone through the power-splitter. Is there anyway we can fix this thing? > > Thanks! > > All Best, > Jack Make sure to use "unknown PPS" in the "sync" options in the source block. What is the magnitude of the phase-offset difference? > > On Fri, Jul 13, 2018 at 8:05 PM, Jack Yang <ccjack@uw.edu > <mailto:ccjack@uw.edu>> wrote: > > Hi I would like to follow up this conversation. Is it possible to > have a constant initial phase offset for every run when power is up? > I knew the B210 can remains constant phase offset across two > receivers during the operation. However, the challenge for me is > that whenever power is up, the initial phase across devices is not > constant. Namely, the first run v.s. the second run will have > different phase offset across two receiver even though I feed into > the same single frequency tone through the power-splitter. Is > there anyway we can fix this thing? > > Thanks! > > All Best, > Jack > > > On Tue, Mar 24, 2015 at 2:38 PM, Ufuk Tamer via USRP-users > <usrp-users@lists.ettus.com <mailto:usrp-users@lists.ettus.com>> > wrote: > > I am using the block in default settings so time sync part is > in default. > > On 24.3.2015 23:20, Marcus D. Leech wrote: >> On 03/24/2015 05:18 PM, Ufuk Tamer wrote: >>> I am using the latest version. I have a simple GRC flow >>> graph that takes two channel I&Q data and then processing >>> this data in Octave. And every time I turn on the receiver >>> (tx & rx locations are fixed), I get different phase offset >>> between two rx channels. >>> >>> In order to apply direction of arrival (DOA) technique, I >>> have to first use a reference signal to detect this random >>> phase offset, remove it and then estimate the angle of >>> transmitter. >>> >> What are you using for time-synch in the UHD source block? >> >> >>> On 24.3.2015 22:12, Marcus D. Leech via USRP-users wrote: >>>> On 03/24/2015 03:12 PM, Ufuk Tamer via USRP-users wrote: >>>>> Dear all, >>>>> >>>>> I am testing the phase offset between two Rx channels of >>>>> B210. For this case, I transmit a sine signal with another >>>>> USRP device and receive it with two RX channels of B210. >>>>> Then I calculate the phase offset between channels. The >>>>> problem is the phase offset changes whenever I reset the >>>>> receiver. So it gives a random phase offset on each device >>>>> turn on. >>>>> >>>>> Is this normal? If yes, what is the reason for this random >>>>> phase offset. Since both channels share the same LO, where >>>>> this "random" phase offset come from? >>>>> >>>>> Thank you... >>>>> >>>>> ------------------------------------------------------------------------ >>>>> /*Ufuk Tamer >>>>> */ >>>> What version of UHD are you using? >>>> >>>> How are you doing the two-channel receive? >>>> >>>> >>>> >>>> >>>> >>>> _______________________________________________ >>>> 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 <http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com> >>> >>> ------------------------------------------------------------------------ >>> /*Ufuk*/ >> > > ------------------------------------------------------------------------ > /*Ufuk */ > > _______________________________________________ > 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 > <http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com> > > >