<div dir="ltr"><div><div><div>Hi Devin,<br><br></div><div>Since you don't see the harmonics when connected to a spectrum analyzer, I don't think there is any leakage happening with the ADC (or anything on the TX side).  If possible, I suggest hooking up a signal generator to the RX side to see if you can see the harmonics.  If you do see them, please provide more detail about the levels of the tones and your settings (freq, gain, siggen freq, siggen level, etc...).<br><br></div><div>I have also been assuming you are using the latest version of UHD (3.8.4).  If not, please be sure you are.<br></div><div><br></div></div>Regards,<br></div>Michael<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Jul 21, 2015 at 3:19 PM, devin kelly via USRP-users <span dir="ltr"><<a href="mailto:usrp-users@lists.ettus.com" target="_blank">usrp-users@lists.ettus.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">So the master clock could be leaking on the X310 mainboard into the ADC.  Would that mean that you can get the clock to leak over to the ADC regardless of the daughtercard being used?  Does anyone else see these tones every 200 MHz or is it just me?<div><br></div><div>Devin</div></div><div class="gmail_extra"><div><div class="h5"><br><div class="gmail_quote">On Mon, Jul 20, 2015 at 5:36 PM, Michael West via USRP-users <span dir="ltr"><<a href="mailto:usrp-users@lists.ettus.com" target="_blank">usrp-users@lists.ettus.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div><div>A further point of clarity.  The clock being fed to the UBX boards on X310 is 50 MHz (1/4 the master clock rate).  The full 200 MHz master clock is being fed to the FPGA, DACs, and ADCs.  On the X310, the DACs  and ADCs are under the daughter boards and the clocking circuitry is between them.</div><div><br></div>Regards,<br></div>Michael<br></div><div><div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Jul 17, 2015 at 2:16 PM, Marcus D. Leech via USRP-users <span dir="ltr"><<a href="mailto:usrp-users@lists.ettus.com" target="_blank">usrp-users@lists.ettus.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
  
    
  
  <div bgcolor="#FFFFFF" text="#000000"><span>
    <div>On 07/17/2015 03:49 PM, devin kelly via
      USRP-users wrote:<br>
    </div>
    <blockquote type="cite">
      <div dir="ltr">Also, I haven't calibrated either unit.  Could that
        be a factor in this?  While I'm bringing this up, if I do
        calibrate these, or any other USRPs I have with daughtercards, I
        run the calibration with all the SMA ports open, right?  No
        cables, terminators, etc.
        <div><br>
        </div>
        <div>Devin</div>
      </div>
    </blockquote></span>
    Yeah, just open should work OK.<br>
    <br>
    <br>
    <blockquote type="cite">
      <div class="gmail_extra"><br>
        <div class="gmail_quote"><div><div>On Fri, Jul 17, 2015 at 3:45 PM, devin
          kelly <span dir="ltr"><<a href="mailto:dwwkelly@gmail.com" target="_blank">dwwkelly@gmail.com</a>></span>
          wrote:<br>
          </div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div>
            <div dir="ltr">I'm not sure what you mean by offset tuning. 
              Is that like just tuning to avoid the tone? Or, is it like
              the tone might have less power at different frequencies I
              tune to (like tuning to 3.0505 GHz might give me a lower
              tone-power than 3.5 GHz)?  <span><font color="#888888">
                  <div><br>
                  </div>
                  <div>Devin</div>
                </font></span></div>
            </div></div><div>
              <div>
                <div class="gmail_extra"><br>
                  <div class="gmail_quote"><div><div>On Fri, Jul 17, 2015 at 3:15
                    PM, <span dir="ltr"><<a href="mailto:mleech@ripnet.com" target="_blank">mleech@ripnet.com</a>></span>
                    wrote:<br>
                    </div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
                      <div style="font-size:10pt;font-family:Verdana,Geneva,sans-serif"><div><div>
                        <p>Try with offset tuning.  If they're still
                          there, then they are probably actual clock
                          spurs, rather than enhanced LO<br>
                           leakage.</p>
                        </div></div><div>
                          <div><div><div>
                            <p> </p>
                            <div> </div>
                            <p>On 2015-07-17 15:04, devin kelly via
                              USRP-users wrote:</p>
                            </div></div><blockquote type="cite" style="padding-left:5px;border-left:#1010ff 2px solid;margin-left:5px"><div><div>
                              <div dir="ltr">Right now I've got two
                                X310s each with two UBXs.  I have each
                                TX/RX antenna on subdev A connected to
                                each other (with 40 dB of attenuation),
                                same for each B subdev.  I have all the
                                RX2 antennas terminated.  
                                <div> </div>
                                <div>I see the tones on regardless of
                                  the subdev/antenna combination.  I
                                  also tried connecting a spectrum
                                  analyzer to the TX/RX antenna ports
                                  and saw no tones.  I also put an
                                  antenna on my spectrum analyzer and
                                  saw no tones over the air with the
                                  antenna right next to each X310.</div>
                                <div> </div>
                                <div>Thanks Again,</div>
                                <div>Devin</div>
                              </div>
                              </div></div><div class="gmail_extra"><div><div><br>
                                <div class="gmail_quote">On Fri, Jul 17,
                                  2015 at 11:19 AM, Marcus Müller <span><<a href="mailto:usrp-users@lists.ettus.com" target="_blank">usrp-users@lists.ettus.com</a>></span>
                                  wrote:<br>
                                  <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
                                    <div>Shielding/separation-wise, the
                                      X310 should be pretty much
                                      superior in every aspect -- not
                                      only is the ADC, DAC, mixer,
                                      amplifier and LO synthesizers in
                                      one package on the B2x0 (the
                                      AD9361); the X310 is modular in
                                      the sense that the MCR doesn't
                                      even appear to the daugtherboards,
                                      necessarily; it's an FPGA-only
                                      clock, generated by the clock
                                      distribution IC on the mainboard,
                                      and the UBX, especially to
                                      suppress strong interferers, has a
                                      metal can (which is unique among
                                      our RF hardware, so far). Under
                                      that metal can, there's a lot of
                                      partitions, which align with the
                                      different jobs and frequency
                                      ranges on the board, compare the
                                      schematic [1].<br>
                                      <br>
                                      So since you're seeing
                                      200MHz-harmonics, these might
                                      either spuriously get into the
                                      antenna ports, or for some reason,
                                      at multiples of 200MHz LO leakage
                                      is worse (I don't expect that).
                                      Have you tried using offset tuning
                                      [2] to reduce these spurs?<br>
                                      <br>
                                      Best regards,<br>
                                      Marcus<br>
                                      <br>
                                      <br>
                                      [1] <a href="http://files.ettus.com/schematics/ubx/ubx.pdf" target="_blank">http://files.ettus.com/schematics/ubx/ubx.pdf</a><br>
                                      [2] <a href="http://files.ettus.com/manual/page_general.html#general_tuning_process" target="_blank">http://files.ettus.com/manual/page_general.html#general_tuning_process</a>
                                      <div>
                                        <div><br>
                                          <br>
                                          <div>On 17.07.2015 17:03,
                                            devin kelly via USRP-users
                                            wrote:</div>
                                        </div>
                                      </div>
                                      <blockquote type="cite" style="padding-left:5px;border-left:#1010ff 2px solid;margin-left:5px">
                                        <div>
                                          <div>
                                            <div dir="ltr">Hello,
                                              <div> </div>
                                              <div>I have an X310 with a
                                                UBX daughtercard.  I've
                                                noticed that there are
                                                tones every 200 MHz (I
                                                checked 2.4GHx, 2.6 GHz,
                                                2.8 GHz, 3 GHz, 3.2
                                                GHz).  Do I have any
                                                options for suppressing
                                                the tones?  Is there any
                                                shielding or RF absorber
                                                I can add somewhere?  </div>
                                              <div> </div>
                                              <div>The B210s seem to
                                                have each section of
                                                radio gated off (to make
                                                it easier to add
                                                shielding?).  But  the
                                                X310s don't as far as I
                                                can tell.</div>
                                              <div> </div>
                                              <div>Thanks for any help,</div>
                                              <div>Devin</div>
                                            </div>
                                            <br>
                                            <fieldset></fieldset>
                                          </div>
                                        </div>
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                                -- <br>
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