List of changes not yet ready (soon).

And thank you for your help in English :)

Best regards,

Andrey Sviyazov.

2012/5/29 Robin Coxe <coxe@close-haul.com>

Hi Andrey. šNice work. š Is there is big list of all of the changes
that have been incorporated into the new design? šThis 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. š Perhaps just
spell out š"assembly"? š;)

-Robin

On Mon, May 28, 2012 at 10:13 PM, Andrey Sviyazov

<andreysviyaz@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 includedšsomešproject 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@gmail.com>
>>
>> Andrey,
>>
>> On Sun, May 20, 2012 at 6:46 PM, Andrey Sviyazov <andreysviyaz@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 / ďďď őÍňÁÄÉĎ
>> http://fairwaves.ru
>
>

--
Robin Coxe š| šClose-Haul Communications, Inc. š| šBoston, MA
+1-617-470-8825