I have a query in to Ettus R&D about possible causes. But you might need, for now to do an initial phase Calibration when you start up.
Sent from my iPhone > On Jun 11, 2021, at 3:39 AM, Skyvalakis Konstantinos <kskyvala...@isc.tuc.gr> > wrote: > > > I repeated the experiments once again today and I got once again the same > results. I still keep on randomly getting these 4 cases I attached on a > previous message. > > > > I observed that cases 1.png and 3.png have a phase difference of +/- 180 > degrees > > and cases 2.png and 4.png also have a phase difference of +/- 180 degrees. > > > > Do you reckon you could help me any further with my problem? I really need to > achieve this synchronization for my thesis. > > > > Thank you very much. > > From: Discuss-gnuradio > <discuss-gnuradio-bounces+kskyvalakis=isc.tuc...@gnu.org> on behalf of > Skyvalakis Konstantinos <kskyvala...@isc.tuc.gr> > Sent: Friday, June 11, 2021 12:39 AM > To: Marcus D. Leech > Cc: Discuss-gnuradio@gnu.org > Subject: Re: Phase Synchronize 2 USRP N200 w/ SBX cards > > Exactly my thoughts as well, I mean regarding the phase ambiguity of the WBX > daughterboards, from what I've read on the Ettus website. > > I am 100% sure the daughterboards are SBX. > > > On Jun 11, 2021 00:26, "Marcus D. Leech" <patchvonbr...@gmail.com> wrote: > On 06/10/2021 01:00 PM, Skyvalakis Konstantinos wrote: > In addition to my last message regarding the INTEGER_N tuning, I repeated > the experiment multiple times. I even restarted the USRPs and the signal > generator multiple times. > > > > What I observed was, that there were only 4 different recurring phase offsets > (Blue = RX2 of SBX1, Red = RX2 of SBX2). > > > > I am attaching the 4 screenshots I captured. > > > > Thank you so much for your help. I feel like we're getting there. > > > > > You're sure that you have SBX cards and not WBX cards? Sorry for the > apparently-stupid question, but the WBX uses almost the > same hardware as the SBX, but uses a 2XLO mixer that has fixed phase > ambiguity--which would look like what you have here. > > >
