UmTRX v1b coming soon

Jean-Samuel Najnudel - BJT PARTNERS SARL jsn at bjtpartners.com
Tue May 29 23:33:46 UTC 2012


Hi Andrey,

Thank you for your e-mail.

This is a great news. Great ideas, great debug, great improvements. Thanks
a lot.

The board looks fine but I will see in deeper details and let you know.

A question just comes to my mind.
20 dBm Tx output is very convenient. This would allow to saturate and
achieve a very good PA efficiency. This is really nice.
In case Tx output is 20 dBm are you sure we would not have any PCB Tx
signal leakage problems ?
A few months ago, you told me maximum Tx power was around 0 dBm to avoid
problems. Did you find a solution to improve isolation and allow the 20 dBm
Tx power ?

Anyway, thanks a lot. Again, the board seems to be really great. This would
also bring a wonderful tool to the SDR, OpenBTS and OpenBSC communities.
Thank you so much for this.

Best regards.

Jean-Samuel.
:-)


On Tue, May 29, 2012 at 7:59 PM, Andrey Sviyazov <andreysviyaz at gmail.com>wrote:

> Hi all.
>
> First of all, Alexander asked me to use UmTRXv2 instead of v1b, so project
> renamed and I'll send whole project later.
> Here "What new in UmTRXv2.txt" in addition to fixed of all known UmTRXv1a
> issues<http://code.google.com/p/umtrx/issues/list?can=1&q=&colspec=ID+Type+Status+Priority+Milestone+Owner+Summary+Modified&cells=tiles>
> .
> Unfortunately, a lot physical changes between v1a and v2 and it is very
> difficult to me to explain all step-by-step in details.
> But I am ready to patiently answer for any kind of questions.
> Here also EEpromConfig.SchDoc and BOM files which changed because C298
> should be Case-A (issue 18<http://code.google.com/p/umtrx/issues/detail?id=18&can=1&colspec=ID%20Type%20Status%20Priority%20Milestone%20Owner%20Summary%20Modified>
> ).
>
> Best regards,
> Andrey Sviyazov.
>
>
>
> 2012/5/29 Andrey Sviyazov <andreysviyaz at gmail.com>
>
>> Here PDF's
>>
>> Best regards,
>> Andrey Sviyazov.
>>
>>
>>
>> 2012/5/29 Andrey Sviyazov <andreysviyaz at gmail.com>
>>
>>> Here PCB file of project.
>>>
>>> Best regards,
>>> Andrey Sviyazov.
>>>
>>>
>>>
>>> 2012/5/29 Andrey Sviyazov <andreysviyaz at gmail.com>
>>>
>>>> Hi all.
>>>>
>>>> First release of UmTRXv1b seems finished.
>>>> All suggestions and issues are welcomed, especially prior to production
>>>> (few days).
>>>> There are 4 Rx inputs to implement either scan function or software
>>>> diversity receiving.
>>>> There are 16pin connector to supply and control external preselector,
>>>> amplifier, LNA, ATT, diversity switch...
>>>> This new release have 2U size (100x160mm) that more universal for
>>>> indoor housing to put together several UmTRX's with PC and power supply
>>>> modules in one rack.
>>>> Also possible variant to meet to requirements -40C and it is the only
>>>> one reason to keep OCVCXO onboard.
>>>> Also possible variant with external control panel to make easily IP65
>>>> housing design.
>>>> Also DC supply voltage can be in range 8..28V to keep single DC supply
>>>> if UmTRX will combined with IP65 tower mounted amplifiers.
>>>>
>>>> And so on depend of your fantasy :)
>>>>
>>>> Here included some project files and BOM for variant with 20dBm Tx and
>>>> onboard control.
>>>> PCB and PDF files will be in the next two e-mails.
>>>>
>>>> Best regards,
>>>> Andrey Sviyazov.
>>>>
>>>>
>>>>
>>>> 2012/5/21 Alexander Chemeris <alexander.chemeris at gmail.com>
>>>>
>>>>> Andrey,
>>>>>
>>>>> On Sun, May 20, 2012 at 6:46 PM, Andrey Sviyazov <
>>>>> andreysviyaz at gmail.com> wrote:
>>>>> > 1) Is it used somewhere? In the datasheet there is probable errors,
>>>>> for
>>>>> > example, 1PPS is specified as input.
>>>>>
>>>>> Use this datasheet, here it's marked as output:
>>>>>
>>>>> http://www.transystem.com.tw/product/66/EB-570%20Data%20Sheet%20V1.4.pdf
>>>>> Probably you have an older version of the datasheet.
>>>>>
>>>>> > 2) There are inputs Reset and Standby. The first can be left open,
>>>>> and the
>>>>> > second is possible need to be connected to to FPGA.
>>>>>
>>>>> Yes.
>>>>>
>>>>> > 3) There Is RTC_CLK_O we don't need him? And that there may be,
>>>>> 32768?
>>>>>
>>>>> Could you route it to a test-point or a 2-pin IDC? I don't think we
>>>>> need this, but it's better to have an ability to access it.
>>>>>
>>>>> > 4) Which of two UART's better to use or are they equivalent? There
>>>>> are no
>>>>> > any words in datasheet about it.
>>>>>
>>>>> Use TX0/RX0 (pins 13/14), which is default to NMEA - see the datasheet
>>>>> above.
>>>>>
>>>>> > 5) Unfortunately no place for both on PCB and we can use either
>>>>> EB-230 or
>>>>> > EB-570.
>>>>>
>>>>> Then we have to use EB-570.
>>>>>
>>>>>
>>>>> --
>>>>> Regards,
>>>>> Alexander Chemeris.
>>>>> CEO, Fairwaves LLC / ООО УмРадио
>>>>> http://fairwaves.ru
>>>>>
>>>>
>>>>
>>>
>>
>
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