Re: Phase Synchronize 2 USRP N200 w/ SBX cards

[Skyvalakis Konstantinos]

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.

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From: Discuss-gnuradio <discuss-gnuradio-bounces+kskyvalakis=isc.tuc.gr@gnu.org> on behalf of Skyvalakis Konstantinos <kskyvalakis@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" <patchvonbraun@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.

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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.