UmTRX v1b coming soon

Andrey Sviyazov andreysviyaz at gmail.com
Tue May 29 13:37:41 UTC 2012


Hi Robin!

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 at close-haul.com>

> 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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