[USRP-users] Strange Behavior between RX2 and TX/RX Receive on b205

2018-04-25 Thread Dominik Eyerly via USRP-users 
Hello,

I'm seeing some strange behavior on some new b205 we've received. These
units are Rev Cs so they should have the new caps at the receive switch
in order to remove the transient behavior I had highlighted in a
previous exchange. Two different units exhibit this exact behavior. The
plot below shows received power in dB (in this case 10 dB = full scale,
not 0)

The top plot is RX2 and the bottom one is Tx/Rx. I would expect both of
these to be very similar, however, there is a significant difference.
This occurs over all gain settings.

We had done some reworks in house of the older boards with the correct
caps an did not see this behavior. Is it possible that something is not
working as expected in the rev Cs? Any idea what could be causing this
behavior?


Best regards,
Dominik

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

2018-02-16 Thread 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 
>> <mailto:d.eye...@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*
>> supp...@konrad-technologies.de <mailto:supp...@konrad-technologies.de>
>> sig
>> Geschäftsleitung: Michael Konrad 
>> Handelsregisternr: HRB 550593 in Freiburg 
>> Ust-Id-Nr. DE 206693267
>>
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>> Dritte sind verboten. Für Zuwiderhandlungen können Sie haftbar gemacht 
>> werden. Falls Sie nicht der Empfänger sind, benachrichtigen Sie den Absender 
>> bitte umgehend. Danke
>>
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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 
<mailto:d.eye...@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*
supp...@konrad-technologies.de <mailto:supp...@konrad-technologies.de>
sig
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Handelsregisternr: HRB 550593 in Freiburg 
Ust-Id-Nr. DE 206693267

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

2018-02-13 Thread 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, 
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Re: [USRP-users] ADC Overflow - B205i

2017-08-21 Thread Dominik Eyerly via USRP-users 
Hi Marcus,

Yes, I saw that in the AD datasheet :)

The answer you provided does sound promising. Would you be able to
provide some more detail on how this is accomplished? A simple example
would be great. If an example is too much work, an explanation of where
the modification takes place and how it would boil up to the user would
be very useful as well.

Also, is there another efficient solution or would this be the one you
recommend?

thanks,
Dominik


On 08/21/2017 05:08 PM, Marcus Müller wrote:
> Dear Mr. Eyerly,
>
> Indeed, the AD9361 has an overload indicator register. (Ad9361 manual
> ug-570, page 76)
>
> We don't directly expose that, but with modifications in our
> host/lib/usrp tree's ad9361_driver, you could expose that by
> publishing a register reader in the property_tree.
>
> Does that sound like the direction you'd like to take this?
>
> Best regards,
> Marcus M
>
> On 21 August 2017 3:42:32 PM GMT+02:00, Dominik Eyerly via USRP-users
> <usrp-users@lists.ettus.com> wrote:
>
> Hello,
>
> Is it possible to obtain a status of the ADC on the B205i using
> the UHD driver? In particular, I am interested in detecting adc
> overflows, i.e. too much power at the input.
>
> Best regards,
> 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
> <mailto:d.eye...@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*
> supp...@konrad-technologies.de <mailto: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 
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> 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 
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> received this communication in error, please contact us immediately. Thank 
> you.
>
>
> -- 
> Sent from my Android device with K-9 Mail. Please excuse my brevity. 

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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 
<mailto:d.eye...@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*
supp...@konrad-technologies.de <mailto: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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[USRP-users] ADC Overflow - B205i

2017-08-21 Thread Dominik Eyerly via USRP-users 
Hello,

Is it possible to obtain a status of the ADC on the B205i using the UHD
driver? In particular, I am interested in detecting adc overflows, i.e.
too much power at the input.

Best regards,
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, 
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nicht der Empfänger sind, benachrichtigen Sie den Absender bitte umgehend. Danke

CONFIDENTIALITY NOTICE: This e-mail and any documents which may accompany it, 
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