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    <div class="moz-cite-prefix">On 03/05/2019 11:21 AM, Koyel Das
      (Vehere) wrote:<br>
    </div>
    <blockquote
cite="mid:MA1PR01MB07154D0BD9212804D293DA3D90720@MA1PR01MB0715.INDPRD01.PROD.OUTLOOK.COM"
      type="cite">
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      So they don’t share same master oscillator? Is this true for 2964R
      as well?<br>
    </blockquote>
    Do you mean the reference clock on the board?  They all share that,
    but each channel has its own LO synthesizer.<br>
    <br>
    I'm not familiar with the 2964R, so can't personally comment on it.<br>
    <br>
    You can achieve 4-channel phase coherence with the TwinRx--see the
    APP Note here:<br>
    <br>
<a class="moz-txt-link-freetext" href="https://kb.ettus.com/Direction_Finding_with_the_USRP%E2%84%A2_X-Series_and_TwinRX%E2%84%A2">https://kb.ettus.com/Direction_Finding_with_the_USRP%E2%84%A2_X-Series_and_TwinRX%E2%84%A2</a><br>
    <br>
    <blockquote
cite="mid:MA1PR01MB07154D0BD9212804D293DA3D90720@MA1PR01MB0715.INDPRD01.PROD.OUTLOOK.COM"
      type="cite">
      <br>
      Koyel Das<br>
      Senior – Product Engineer<br>
      Vehere | Proactive Communications Intelligence & Cyber Defence<br>
      M: +919051132173 | T: +91 33 40545454 | F: +91 33 40545455 | W:
      <a class="moz-txt-link-abbreviated" href="http://www.vehere.com">www.vehere.com</a><br>
      <br>
      <br>
      <br>
      Vehere is the proud recipient of the Fastest Growing Technology
      Company Awards in India & Asia since 2012!<br>
      <br>
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      <div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt"
          color="#000000" face="Calibri, sans-serif"><b>From:</b> Marcus
          D. Leech <a class="moz-txt-link-rfc2396E" href="mailto:patchvonbraun@gmail.com"><patchvonbraun@gmail.com></a><br>
          <b>Sent:</b> Tuesday, March 5, 2019 9:49:28 PM<br>
          <b>To:</b> Koyel Das (Vehere); '<a class="moz-txt-link-abbreviated" href="mailto:USRP-users@lists.ettus.com">USRP-users@lists.ettus.com</a>'<br>
          <b>Subject:</b> Re: [USRP-users] different phase difference
          using splitter on each run</font>
        <div> </div>
      </div>
      <div style="background-color:#FFFFFF">
        <div class="x_moz-cite-prefix">On 03/05/2019 11:10 AM, Koyel Das
          (Vehere) wrote:<br>
        </div>
        <blockquote type="cite">Are RX1 and RX2 of RF0 controlled by
          same master oscillator? Will connecting two antennas to RX1
          and RX2 of RF0, rather than to RX1 of RF0 and to RX1 of RF1,
          give same phase difference between these two channels at every
          run?<br>
        </blockquote>
        All channels have their own LO.<br>
        <br>
        The TwinRx has LO sharing mode.<br>
        <br>
        <br>
        <blockquote type="cite"><br>
          Koyel Das<br>
          Senior – Product Engineer<br>
          Vehere | Proactive Communications Intelligence & Cyber
          Defence<br>
          M: +919051132173 | T: +91 33 40545454 | F: +91 33 40545455 |
          W: <a moz-do-not-send="true"
            class="x_moz-txt-link-abbreviated"
            href="http://www.vehere.com">
            www.vehere.com</a><br>
          <br>
          <br>
          <br>
          Vehere is the proud recipient of the Fastest Growing
          Technology Company Awards in India & Asia since 2012!<br>
          <br>
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          Interactive Pvt Ltd. Before opening and accessing the
          attachment please check and scan for virus. WARNING: Computer
          viruses can be transmitted via email. The recipient should
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          <hr tabindex="-1" style="display:inline-block; width:98%">
          <div id="x_divRplyFwdMsg" dir="ltr"><font
              style="font-size:11pt" color="#000000" face="Calibri,
              sans-serif"><b>From:</b> USRP-users
              <a moz-do-not-send="true" class="x_moz-txt-link-rfc2396E"
                href="mailto:usrp-users-bounces@lists.ettus.com">
                <usrp-users-bounces@lists.ettus.com></a> on behalf
              of Marcus D. Leech via USRP-users
              <a moz-do-not-send="true" class="x_moz-txt-link-rfc2396E"
                href="mailto:usrp-users@lists.ettus.com"><usrp-users@lists.ettus.com></a><br>
              <b>Sent:</b> Tuesday, March 5, 2019 7:03:42 PM<br>
              <b>To:</b> <a moz-do-not-send="true"
                class="x_moz-txt-link-abbreviated"
                href="mailto:usrp-users@lists.ettus.com">
                usrp-users@lists.ettus.com</a><br>
              <b>Subject:</b> Re: [USRP-users] different phase
              difference using splitter on each run</font>
            <div> </div>
          </div>
          <div style="background-color:#FFFFFF">
            <div class="x_x_moz-cite-prefix">On 03/05/2019 06:01 AM,
              Koyel Das (Vehere) via USRP-users wrote:<br>
            </div>
            <blockquote type="cite">
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                <p style="margin-top:0; margin-bottom:0">Hi,</p>
                <p style="margin-top:0; margin-bottom:0"><br>
                </p>
                <p style="margin-top:0; margin-bottom:0">I am using USRP
                  2955 R and I have connected an antenna to one end of a
                  two channel splitter and connected the other two ports
                  of the splitter to the two RX1 pors of USRP. I am
                  getting different phase difference in each run of USRP
                  though in one particular run the phase difference is
                  constant for all channels. The tuned frequency is 2.4
                  GHz and sampling rate is 1 MSps so as expected that
                  channel phase differences are almost same. But when I
                  stop acquiring data and restart it using gnuradio or
                  the API, then I am getting again a new value of phase
                  difference across all channels, which is again same
                  across channels. Is USRP so unstable that it gives
                  different value of phase difference for each run for
                  the same frequency, and sampling rate? The setup in
                  the runs are also the same.</p>
                <p style="margin-top:0; margin-bottom:0"><br>
                </p>
                <p style="margin-top:0; margin-bottom:0">Regards,</p>
                <p style="margin-top:0; margin-bottom:0">Koyel</p>
                <p style="margin-top:0; margin-bottom:0"><br>
                </p>
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                    <p style=""><font face="Tahoma,serif"><font
                          style="font-size:9pt">Koyel Das
                                                              <br>
                          Senior – Product Engineer</font></font></p>
                    <font style="font-size:16px" face="Tahoma,serif"><font
                        style="font-size:9pt">Vehere | Proactive
                        Communications Intelligence & Cyber Defence</font></font><font
                      style="font-size:16px" face="Tahoma,serif"><font
                        style="font-size:9pt"><br>
                        M: +919051132173 | </font></font><font
                      style="font-size:16px" face="Tahoma,serif"><font
                        style="font-size:9pt">T: +91 33 40545454 | F:
                        +91 33 40545455 | W: <a moz-do-not-send="true"
                          href="http://www.vehere.com/" target="_blank"
                          rel="noopener noreferrer" id="LPNoLP">www.vehere.com</a></font></font><font
                      style="font-size:16px" face="Tahoma,serif"><font
                        style="font-size:9pt"><i><br>
                        </i></font></font></div>
                </div>
              </div>
            </blockquote>
            <font face="Tahoma,serif"><i><br>
              </i>This isn't about "instability".  It's about the way
              PLL synthesizers work, and the fact that by default each
              channel is using its own synthesizer.<br>
              <br>
              There are a few things that need to happen:<br>
              <br>
                 All the channels you're receiving need to be in the
              same multi_usrp block, which, among other things, is a
              conceptual "synchronization domain".<br>
              <br>
                 Use timed-commands for tuning (which is a bit awkward
              to arrange in Gnu Radio, you'll have to modify the
              generated code).  This will arrange<br>
                 for the synthesizers to be given a "resynch" signal at
              exactly the same time.<br>
              <br>
                 OR<br>
              <br>
                 Use the "shared LO" features of the TwinRX cards that
              are on the 2955.<br>
              <br>
              See the knowledge-base document on the TwinRX and
              phase-synchronization here:<br>
              <br>
              <a moz-do-not-send="true"
                class="x_x_moz-txt-link-freetext"
                href="https://kb.ettus.com/TwinRX">https://kb.ettus.com/TwinRX</a><br>
              <br>
              <br>
                 <br>
              <br>
              <br>
            </font>
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                        The content of this e-mail is confidential and
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                        and/or its associates/ group companies/
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                        Vehere Interactive Pvt Ltd. Before opening and
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                        for virus. WARNING: Computer viruses can be
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