Re: [USRP-users] Poor Tx/Rx Isolation on B205

[Marcus D. Leech via USRP-users]

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 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.eye...@konrad-technologies.de  

*Konrad GmbH — Fritz-Reichle-Ring 12 — D-78315 Radolfzell*
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www.abexstandard.org  

*Support Telefon: +49 (0) 7732 9815 100*
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--
i.A. Dominik Eyerly
Head of RF Software

Tel:  +49 (0) 351 7958019 233
Fax: +49 (0) 351 7958019 232
Email:d.eye...@konrad-technologies.de  

*Konrad GmbH — Fritz-Reichle-Ring 12 — D-78315 Radolfzell*
www.konrad-technologies.de  
www.abexstandard.org  

*Support Telefon: +49 (0) 7732 9815 100*
supp...@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, 
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bestimmt. Diese können vertraulich und/oder von Veröffentlichungen ausgenommen 
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intended 

Re: [USRP-users] Poor Tx/Rx Isolation on B205

[Dominik Eyerly via USRP-users]

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.eye...@konrad-technologies.de 
>> 
>>
>> *Konrad GmbH — Fritz-Reichle-Ring 12 — D-78315 Radolfzell*
>> www.konrad-technologies.de 
>> www.abexstandard.org 
>>
>> *Support Telefon: +49 (0) 7732 9815 100*
>> supp...@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.
>>
>>
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>> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>
>
>
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-- 



-- 

i.A. Dominik Eyerly
Head of RF Software

Tel:  +49 (0) 351 7958019 233
Fax: +49 (0) 351 7958019 232
Email:   d.eye...@konrad-technologies.de 


*Konrad GmbH — Fritz-Reichle-Ring 12 — D-78315 Radolfzell*
www.konrad-technologies.de 
www.abexstandard.org 

*Support Telefon: +49 (0) 7732 9815 100*
supp...@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 

Re: [USRP-users] Poor Tx/Rx Isolation on B205

[Tom Bereknyei via USRP-users]

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.eye...@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*supp...@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.
>
>
>
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>
>
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-- 
Maj Tom Bereknyei
Defense Digital Service
t...@dds.mil
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Re: [USRP-users] Poor Tx/Rx Isolation on B205

[Marcus D. Leech via USRP-users]

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.eye...@konrad-technologies.de  

*Konrad GmbH — Fritz-Reichle-Ring 12 — D-78315 Radolfzell*
www.konrad-technologies.de  
www.abexstandard.org  

*Support Telefon: +49 (0) 7732 9815 100*
supp...@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 
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[USRP-users] Poor Tx/Rx Isolation on B205

[Dominik Eyerly via USRP-users]

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.eye...@konrad-technologies.de 


*Konrad GmbH — Fritz-Reichle-Ring 12 — D-78315 Radolfzell*
www.konrad-technologies.de 
www.abexstandard.org 

*Support Telefon: +49 (0) 7732 9815 100*
supp...@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.



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