Hello, I've noticed that the isolation between the Tx/Rx and the Rx2 port is quite poor at the upper frequencies ~22dB at 5.9GHz. Could you explain if this is to be expected? Would it be possible to know which switch you are using? Any way to improve the isolation? cheers, Dominik -- -- i.A. Dominik Eyerly Head of RF Software Tel: +49 (0) 351 7958019 233 Fax: +49 (0) 351 7958019 232 Email: d.eyerly@konrad-technologies.de <mailto:d.eyerly@konrad-technologies.de> *Konrad GmbH — Fritz-Reichle-Ring 12 — D-78315 Radolfzell* www.konrad-technologies.de <http://www.konrad-technologies.de> www.abexstandard.org <http://www.abexstandard.org> *Support Telefon: +49 (0) 7732 9815 100* support@konrad-technologies.de <mailto:support@konrad-technologies.de> sig Geschäftsleitung: Michael Konrad Handelsregisternr: HRB 550593 in Freiburg Ust-Id-Nr. DE 206693267 VERTRAULICHKEITS-INFORMATION: Dieses e-Mail und alle anhängenden Dokumente, enthalten Informationen der Konrad GmbH und sind nur für die adressierte Person bestimmt. Diese können vertraulich und/oder von Veröffentlichungen ausgenommen sein. Das Kopieren und die Weitergabe an nicht autorisierte Dritte sind verboten. Für Zuwiderhandlungen können Sie haftbar gemacht werden. Falls Sie nicht der Empfänger sind, benachrichtigen Sie den Absender bitte umgehend. Danke CONFIDENTIALITY NOTICE: This e-mail and any documents which may accompany it, contains information from Konrad GmbH, which is intended only for the use of the individual or entity to which it is addressed, and which may contain information that is privileged, confidential, and/or otherwise exempt from disclosure under applicable law. If the reader of this message is not the intended recipient, any disclosure, dissemination, distribution, copying or other use of this communication or its substance is prohibited. If you have received this communication in error, please contact us immediately. Thank you.

On 02/13/2018 03:30 AM, Dominik Eyerly via USRP-users wrote: > > Hello, > > I've noticed that the isolation between the Tx/Rx and the Rx2 port is > quite poor at the upper frequencies ~22dB at 5.9GHz. Could you explain > if this is to be expected? Would it be possible to know which switch > you are using? Any way to improve the isolation? > > > cheers, > Dominik > > -- > > The schematics for B20xmini are here: http://files.ettus.com/schematics/b200mini/ How are you measuring isolation? Are both ports terminated in 50ohms? You could remove C23, which would improve isolation a bit further, but you'd be stuck with only EVER using RX2 for receive, and this would of course void your warranty. > > -- > i.A. Dominik Eyerly > Head of RF Software > > Tel: +49 (0) 351 7958019 233 > Fax: +49 (0) 351 7958019 232 > Email:d.eyerly@konrad-technologies.de <mailto:d.eyerly@konrad-technologies.de> > > *Konrad GmbH — Fritz-Reichle-Ring 12 — D-78315 Radolfzell* > www.konrad-technologies.de <http://www.konrad-technologies.de> > www.abexstandard.org <http://www.abexstandard.org> > > *Support Telefon: +49 (0) 7732 9815 100* > support@konrad-technologies.de <mailto:support@konrad-technologies.de> > sig > Geschäftsleitung: Michael Konrad > Handelsregisternr: HRB 550593 in Freiburg > Ust-Id-Nr. DE 206693267 > > VERTRAULICHKEITS-INFORMATION: Dieses e-Mail und alle anhängenden Dokumente, enthalten Informationen der Konrad GmbH und sind nur für die adressierte Person bestimmt. Diese können vertraulich und/oder von Veröffentlichungen ausgenommen sein. Das Kopieren und die Weitergabe an nicht autorisierte Dritte sind verboten. Für Zuwiderhandlungen können Sie haftbar gemacht werden. Falls Sie nicht der Empfänger sind, benachrichtigen Sie den Absender bitte umgehend. Danke > > CONFIDENTIALITY NOTICE: This e-mail and any documents which may accompany it, contains information from Konrad GmbH, which is intended only for the use of the individual or entity to which it is addressed, and which may contain information that is privileged, confidential, and/or otherwise exempt from disclosure under applicable law. If the reader of this message is not the intended recipient, any disclosure, dissemination, distribution, copying or other use of this communication or its substance is prohibited. If you have received this communication in error, please contact us immediately. Thank you. > > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com

What would the equivalent of this be for the e310? On Tue, Feb 13, 2018 at 16:23 Marcus D. Leech via USRP-users < usrp-users@lists.ettus.com> wrote: > On 02/13/2018 03:30 AM, Dominik Eyerly via USRP-users wrote: > > Hello, > > I've noticed that the isolation between the Tx/Rx and the Rx2 port is > quite poor at the upper frequencies ~22dB at 5.9GHz. Could you explain if > this is to be expected? Would it be possible to know which switch you are > using? Any way to improve the isolation? > > > cheers, > Dominik > -- > > > The schematics for B20xmini are here: > > http://files.ettus.com/schematics/b200mini/ > > How are you measuring isolation? Are both ports terminated in 50ohms? > > You could remove C23, which would improve isolation a bit further, but > you'd be stuck with only EVER using RX2 for receive, and this would of > course > void your warranty. > > > > > -- > > i.A. Dominik Eyerly > Head of RF Software > > Tel: +49 (0) 351 7958019 233 > Fax: +49 (0) 351 7958019 232 > Email: d.eyerly@konrad-technologies.de > *Konrad GmbH — Fritz-Reichle-Ring 12 — D-78315 Radolfzell*www.konrad-technologies.dewww.abexstandard.org > *Support Telefon: +49 (0) 7732 9815 100*support@konrad-technologies.de[image: sig] > Geschäftsleitung: Michael Konrad > Handelsregisternr: HRB 550593 in Freiburg > Ust-Id-Nr. DE 206693267 > > VERTRAULICHKEITS-INFORMATION: Dieses e-Mail und alle anhängenden Dokumente, enthalten Informationen der Konrad GmbH und sind nur für die adressierte Person bestimmt. Diese können vertraulich und/oder von Veröffentlichungen ausgenommen sein. Das Kopieren und die Weitergabe an nicht autorisierte Dritte sind verboten. Für Zuwiderhandlungen können Sie haftbar gemacht werden. Falls Sie nicht der Empfänger sind, benachrichtigen Sie den Absender bitte umgehend. Danke > > CONFIDENTIALITY NOTICE: This e-mail and any documents which may accompany it, contains information from Konrad GmbH, which is intended only for the use of the individual or entity to which it is addressed, and which may contain information that is privileged, confidential, and/or otherwise exempt from disclosure under applicable law. If the reader of this message is not the intended recipient, any disclosure, dissemination, distribution, copying or other use of this communication or its substance is prohibited. If you have received this communication in error, please contact us immediately. Thank you. > > > > _______________________________________________ > USRP-users mailing listUSRP-users@lists.ettus.comhttp://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > -- Maj Tom Bereknyei Defense Digital Service tom@dds.mil

Hi Marcus, Yes, I'm measuring the isolation with both ports terminated. Modifying the board so that switching is no longer available is not really an option for us. Especially since it voids the warranty. Any chance of using a better performing switch in future revs? This one has an isolation min of 17dB. CMOS switches are readily available at these frequencies that offer double this performance as well as better return loss. Just an idea :) It would certainly help us as we deploy this board in various testing solutions. In particular, at 433MHz, where the RL is quite poor with this switch ~ 7dB. cheers, Dominik On 02/13/2018 10:22 PM, Marcus D. Leech via USRP-users wrote: > On 02/13/2018 03:30 AM, Dominik Eyerly via USRP-users wrote: >> >> Hello, >> >> I've noticed that the isolation between the Tx/Rx and the Rx2 port is >> quite poor at the upper frequencies ~22dB at 5.9GHz. Could you >> explain if this is to be expected? Would it be possible to know which >> switch you are using? Any way to improve the isolation? >> >> >> cheers, >> Dominik >> >> -- >> >> > The schematics for B20xmini are here: > > http://files.ettus.com/schematics/b200mini/ > > How are you measuring isolation?  Are both ports terminated in 50ohms? > > You could remove C23, which would improve isolation a bit further, but > you'd be stuck with only EVER using RX2 for receive, and this would of > course >   void your warranty. > > >> >> -- >> i.A. Dominik Eyerly >> Head of RF Software >> >> Tel: +49 (0) 351 7958019 233 >> Fax: +49 (0) 351 7958019 232 >> Email: d.eyerly@konrad-technologies.de <mailto:d.eyerly@konrad-technologies.de> >> >> *Konrad GmbH — Fritz-Reichle-Ring 12 — D-78315 Radolfzell* >> www.konrad-technologies.de <http://www.konrad-technologies.de> >> www.abexstandard.org <http://www.abexstandard.org> >> >> *Support Telefon: +49 (0) 7732 9815 100* >> support@konrad-technologies.de <mailto:support@konrad-technologies.de> >> sig >> Geschäftsleitung: Michael Konrad >> Handelsregisternr: HRB 550593 in Freiburg >> Ust-Id-Nr. DE 206693267 >> >> VERTRAULICHKEITS-INFORMATION: Dieses e-Mail und alle anhängenden Dokumente, enthalten Informationen der Konrad GmbH und sind nur für die adressierte Person bestimmt. Diese können vertraulich und/oder von Veröffentlichungen ausgenommen sein. Das Kopieren und die Weitergabe an nicht autorisierte Dritte sind verboten. Für Zuwiderhandlungen können Sie haftbar gemacht werden. Falls Sie nicht der Empfänger sind, benachrichtigen Sie den Absender bitte umgehend. Danke >> >> CONFIDENTIALITY NOTICE: This e-mail and any documents which may accompany it, contains information from Konrad GmbH, which is intended only for the use of the individual or entity to which it is addressed, and which may contain information that is privileged, confidential, and/or otherwise exempt from disclosure under applicable law. If the reader of this message is not the intended recipient, any disclosure, dissemination, distribution, copying or other use of this communication or its substance is prohibited. If you have received this communication in error, please contact us immediately. Thank you. >> >> >> _______________________________________________ >> USRP-users mailing list >> USRP-users@lists.ettus.com >> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > > > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com -- -- i.A. Dominik Eyerly Head of RF Software Tel: +49 (0) 351 7958019 233 Fax: +49 (0) 351 7958019 232 Email: d.eyerly@konrad-technologies.de <mailto:d.eyerly@konrad-technologies.de> *Konrad GmbH — Fritz-Reichle-Ring 12 — D-78315 Radolfzell* www.konrad-technologies.de <http://www.konrad-technologies.de> www.abexstandard.org <http://www.abexstandard.org> *Support Telefon: +49 (0) 7732 9815 100* support@konrad-technologies.de <mailto:support@konrad-technologies.de> sig Geschäftsleitung: Michael Konrad Handelsregisternr: HRB 550593 in Freiburg Ust-Id-Nr. DE 206693267 VERTRAULICHKEITS-INFORMATION: Dieses e-Mail und alle anhängenden Dokumente, enthalten Informationen der Konrad GmbH und sind nur für die adressierte Person bestimmt. Diese können vertraulich und/oder von Veröffentlichungen ausgenommen sein. Das Kopieren und die Weitergabe an nicht autorisierte Dritte sind verboten. Für Zuwiderhandlungen können Sie haftbar gemacht werden. Falls Sie nicht der Empfänger sind, benachrichtigen Sie den Absender bitte umgehend. Danke CONFIDENTIALITY NOTICE: This e-mail and any documents which may accompany it, contains information from Konrad GmbH, which is intended only for the use of the individual or entity to which it is addressed, and which may contain information that is privileged, confidential, and/or otherwise exempt from disclosure under applicable law. If the reader of this message is not the intended recipient, any disclosure, dissemination, distribution, copying or other use of this communication or its substance is prohibited. If you have received this communication in error, please contact us immediately. Thank you.

On 02/16/2018 06:55 AM, Dominik Eyerly via USRP-users wrote: > > Hi Marcus, > > Yes, I'm measuring the isolation with both ports terminated. Modifying > the board so that switching is no longer available is not really an > option for us. Especially since it voids the warranty. Any chance of > using a better performing switch in future revs? This one has an > isolation min of 17dB. CMOS switches are readily available at these > frequencies that offer double this performance as well as better > return loss. Just an idea :) It would certainly help us as we deploy > this board in various testing solutions. In particular, at 433MHz, > where the RL is quite poor with this switch ~ 7dB. > > cheers, > Dominik > > No idea whether this would be feasible--someone from Ettus R&D could comment. > On 02/13/2018 10:22 PM, Marcus D. Leech via USRP-users wrote: >> On 02/13/2018 03:30 AM, Dominik Eyerly via USRP-users wrote: >>> >>> Hello, >>> >>> I've noticed that the isolation between the Tx/Rx and the Rx2 port >>> is quite poor at the upper frequencies ~22dB at 5.9GHz. Could you >>> explain if this is to be expected? Would it be possible to know >>> which switch you are using? Any way to improve the isolation? >>> >>> >>> cheers, >>> Dominik >>> >>> -- >>> >>> >> The schematics for B20xmini are here: >> >> http://files.ettus.com/schematics/b200mini/ >> >> How are you measuring isolation? Are both ports terminated in 50ohms? >> >> You could remove C23, which would improve isolation a bit further, >> but you'd be stuck with only EVER using RX2 for receive, and this >> would of course >> void your warranty. >> >> >>> >>> -- >>> i.A. Dominik Eyerly >>> Head of RF Software >>> >>> Tel: +49 (0) 351 7958019 233 >>> Fax: +49 (0) 351 7958019 232 >>> Email:d.eyerly@konrad-technologies.de <mailto:d.eyerly@konrad-technologies.de> >>> >>> *Konrad GmbH — Fritz-Reichle-Ring 12 — D-78315 Radolfzell* >>> www.konrad-technologies.de <http://www.konrad-technologies.de> >>> www.abexstandard.org <http://www.abexstandard.org> >>> >>> *Support Telefon: +49 (0) 7732 9815 100* >>> support@konrad-technologies.de <mailto:support@konrad-technologies.de> >>> sig >>> Geschäftsleitung: Michael Konrad >>> Handelsregisternr: HRB 550593 in Freiburg >>> Ust-Id-Nr. DE 206693267 >>> >>> VERTRAULICHKEITS-INFORMATION: Dieses e-Mail und alle anhängenden Dokumente, enthalten Informationen der Konrad GmbH und sind nur für die adressierte Person bestimmt. Diese können vertraulich und/oder von Veröffentlichungen ausgenommen sein. Das Kopieren und die Weitergabe an nicht autorisierte Dritte sind verboten. Für Zuwiderhandlungen können Sie haftbar gemacht werden. Falls Sie nicht der Empfänger sind, benachrichtigen Sie den Absender bitte umgehend. Danke >>> >>> CONFIDENTIALITY NOTICE: This e-mail and any documents which may accompany it, contains information from Konrad GmbH, which is intended only for the use of the individual or entity to which it is addressed, and which may contain information that is privileged, confidential, and/or otherwise exempt from disclosure under applicable law. If the reader of this message is not the intended recipient, any disclosure, dissemination, distribution, copying or other use of this communication or its substance is prohibited. If you have received this communication in error, please contact us immediately. Thank you. >>> >>> >>> _______________________________________________ >>> USRP-users mailing list >>> USRP-users@lists.ettus.com >>> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >> >> >> >> _______________________________________________ >> USRP-users mailing list >> USRP-users@lists.ettus.com >> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > > -- > > > > -- > i.A. Dominik Eyerly > Head of RF Software > > Tel: +49 (0) 351 7958019 233 > Fax: +49 (0) 351 7958019 232 > Email:d.eyerly@konrad-technologies.de <mailto:d.eyerly@konrad-technologies.de> > > *Konrad GmbH — Fritz-Reichle-Ring 12 — D-78315 Radolfzell* > www.konrad-technologies.de <http://www.konrad-technologies.de> > www.abexstandard.org <http://www.abexstandard.org> > > *Support Telefon: +49 (0) 7732 9815 100* > support@konrad-technologies.de <mailto:support@konrad-technologies.de> > sig > Geschäftsleitung: Michael Konrad > Handelsregisternr: HRB 550593 in Freiburg > Ust-Id-Nr. DE 206693267 > > VERTRAULICHKEITS-INFORMATION: Dieses e-Mail und alle anhängenden Dokumente, enthalten Informationen der Konrad GmbH und sind nur für die adressierte Person bestimmt. Diese können vertraulich und/oder von Veröffentlichungen ausgenommen sein. Das Kopieren und die Weitergabe an nicht autorisierte Dritte sind verboten. Für Zuwiderhandlungen können Sie haftbar gemacht werden. Falls Sie nicht der Empfänger sind, benachrichtigen Sie den Absender bitte umgehend. Danke > > CONFIDENTIALITY NOTICE: This e-mail and any documents which may accompany it, contains information from Konrad GmbH, which is intended only for the use of the individual or entity to which it is addressed, and which may contain information that is privileged, confidential, and/or otherwise exempt from disclosure under applicable law. If the reader of this message is not the intended recipient, any disclosure, dissemination, distribution, copying or other use of this communication or its substance is prohibited. If you have received this communication in error, please contact us immediately. Thank you. > > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com