UmTRX v1b coming soon

Andrey Sviyazov andreysviyaz at
Tue May 29 02:02:06 UTC 2012

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>

> Andrey,
> On Sun, May 20, 2012 at 6:46 PM, Andrey Sviyazov <andreysviyaz at>
> 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:
> 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
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