UmTRX v1b coming soon

Robin Coxe coxe at close-haul.com
Tue May 29 12:05:23 UTC 2012


Hi Andrey.  Nice work.   Is there is big list of all of the changes
that have been incorporated into the new design?  This change record
would be very helpful.

A minor English language note to avoid unintentional bad puns-- you
might not want to have a filename with "ass" in it.   Perhaps just
spell out  "assembly"?  ;)

-Robin

On Mon, May 28, 2012 at 10:13 PM, Andrey Sviyazov
<andreysviyaz at gmail.com> wrote:
> Hi all.
>
> Sorry Robin and Sylvain, I did not check CC first time.
> Here project files and my small explanation for you.
>
> 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
>
>



-- 
Robin Coxe  |  Close-Haul Communications, Inc.  |  Boston, MA
+1-617-470-8825



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