This is merely a historical archive of years 2008-2021, before the migration to mailman3.
A maintained and still updated list archive can be found at https://lists.osmocom.org/hyperkitty/list/UmTRX@lists.osmocom.org/.
Robin Coxe coxe at close-haul.comHi 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