UmTRX v1b coming soon

Andrey Sviyazov andreysviyaz at gmail.com
Tue May 29 02:05:53 UTC 2012


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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