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List: usrp-users
Subject: [USRP-users] Re: OFDM signal transmission by x310 presents a peak
From: Rob Kossler via USRP-users <usrp-users () lists ! ettus ! com>
Date: 2024-02-29 16:55:16
Message-ID: CAB__hTQnZsTLor7OqOM2j5BPvCWj5ENJGJuHkr4FrFTROTddCQ () mail ! gmail ! com
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This link
<https://files.ettus.com/manual/page_calibration.html#calibration_self_utils>
indicates that the antenna ports are to remain unconnected. Since there is
no internal loopback path, I believe that the calibration algorithm
utilizes the "leakage" signal which is apparently strong enough such that
it can be minimized with the appropriate calibration adjustments.
Rob
On Thu, Feb 29, 2024 at 11:16 AM zhou via USRP-users <
usrp-users@lists.ettus.com> wrote:
> Hi Cédric,
>
> It was instructed by Ettus engineer when we started to use USRPs a few
> years ago. This is because there is no internal loopback path in circuit in
> X310. By the way, we are using UBX daughterboard. Maybe this is not
> documented.
>
> Regards,
> Hongwei
>
>
>
> On Thursday, 29 February 2024 at 15:05:37 GMT, Cédric Hannotier via
> USRP-users <usrp-users@lists.ettus.com> wrote:
>
>
> Hi Hongwei,
>
> On 2024-02-26 10:06 +0000, zhou wrote:
> > For X310 USRPs, you need to loopback connect the antenna ports.
>
> Could you direct me to where you got that info?
> I never encountered it, and I am not able to find it in the Ettus docs.
> Doing proper calibration is important,
> so we should ensure that the Ettus docs give the correct procedure...
>
> Kind regards
>
> --
>
> Cédric Hannotier
> _______________________________________________
> USRP-users mailing list -- usrp-users@lists.ettus.com
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>
[Attachment #5 (text/html)]
<div dir="ltr"><a href="https://files.ettus.com/manual/page_calibration.html#calibration_self_utils">This \
link</a> indicates that the antenna ports are to remain unconnected. Since there is \
no internal loopback path, I believe that the calibration algorithm utilizes the \
"leakage" signal which is apparently strong enough such that it can be \
minimized with the appropriate calibration \
adjustments.<div>Rob<br><div><br></div></div></div><br><div class="gmail_quote"><div \
dir="ltr" class="gmail_attr">On Thu, Feb 29, 2024 at 11:16 AM zhou via USRP-users \
<<a href="mailto:usrp-users@lists.ettus.com">usrp-users@lists.ettus.com</a>> \
wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px \
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div><div \
style="font-family:"Helvetica \
Neue",Helvetica,Arial,sans-serif;font-size:13px"><div></div> <div dir="ltr">Hi \
<span><span style="color:rgb(38,40,42);font-family:"Helvetica \
Neue",Helvetica,Arial,sans-serif">Cédric,</span></span></div><div \
dir="ltr"><span><span style="color:rgb(38,40,42);font-family:"Helvetica \
Neue",Helvetica,Arial,sans-serif"><br></span></span></div><div \
dir="ltr"><span><span style="color:rgb(38,40,42);font-family:"Helvetica \
Neue",Helvetica,Arial,sans-serif">It was instructed by Ettus engineer when we \
started to use USRPs a few years ago. This is because there is no internal loopback \
path in circuit in X310. By the way, <span><span \
style="color:rgb(38,40,42);font-family:"Helvetica \
Neue",Helvetica,Arial,sans-serif">we are using UBX <span><span \
style="color:rgb(38,40,42);font-family:"Helvetica \
Neue",Helvetica,Arial,sans-serif">daughterboard</span></span>. <span><span \
style="color:rgb(38,40,42);font-family:"Helvetica \
Neue",Helvetica,Arial,sans-serif">Maybe this is not documented. \
</span></span></span></span></span></span></div><div dir="ltr"><br></div><div \
dir="ltr"><font color="#26282a">Regards,</font></div><div dir="ltr"><font \
color="#26282a">Hongwei</font></div><div dir="ltr"><font \
color="#26282a"><br></font></div><div><br></div><div><br></div>
</div><div id="m_4657819979303724381ydp66e1514ayahoo_quoted_9724218575">
<div style="font-family:"Helvetica \
Neue",Helvetica,Arial,sans-serif;font-size:13px;color:rgb(38,40,42)">
<div>
On Thursday, 29 February 2024 at 15:05:37 GMT, Cédric Hannotier \
via USRP-users <<a href="mailto:usrp-users@lists.ettus.com" \
target="_blank">usrp-users@lists.ettus.com</a>> wrote: </div>
<div><br></div>
<div><br></div>
<div>Hi Hongwei,<br clear="none"><br clear="none">On 2024-02-26 10:06 \
+0000, zhou wrote:<br clear="none">> For X310 USRPs, you need to loopback connect \
the antenna ports. <br clear="none"><br clear="none">Could you direct me to where you \
got that info?<br clear="none">I never encountered it, and I am not able to find it \
in the Ettus docs.<br clear="none">Doing proper calibration is important,<br \
clear="none">so we should ensure that the Ettus docs give the correct procedure...<br \
clear="none"><br clear="none">Kind regards<div \
id="m_4657819979303724381ydp66e1514ayqtfd09939"><br clear="none">-- <br \
clear="none"><br clear="none">Cédric Hannotier<br \
clear="none">_______________________________________________<br \
clear="none">USRP-users mailing list -- <a shape="rect" \
href="mailto:usrp-users@lists.ettus.com" rel="nofollow" \
target="_blank">usrp-users@lists.ettus.com</a><br clear="none">To unsubscribe send an \
email to <a shape="rect" href="mailto:usrp-users-leave@lists.ettus.com" \
rel="nofollow" target="_blank">usrp-users-leave@lists.ettus.com</a><br \
clear="none"></div></div> </div>
</div></div>_______________________________________________<br>
USRP-users mailing list -- <a href="mailto:usrp-users@lists.ettus.com" \
target="_blank">usrp-users@lists.ettus.com</a><br> To unsubscribe send an email to <a \
href="mailto:usrp-users-leave@lists.ettus.com" \
target="_blank">usrp-users-leave@lists.ettus.com</a><br> </blockquote></div>
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