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Jean-Samuel Najnudel - BJT PARTNERS SARL jsn at bjtpartners.comHi Andrey, Thank you very much for your reply. Yes, great idea. I think this really makes sense. Adding this amplifier would be better in most cases and cannot be worse than just saturating the LMS Tx without amplifier. Now I understand and fully agree with you. Best regards. Jean-Samuel. :-) Le 30 mai 2012 22:28, "Andrey Sviyazov" <andreysviyaz at gmail.com> a écrit : > Hi Jean-Samuel. > > Unfortunately nobody can say about isolation between Tx and Rx of the > LMS6002 chip, about which I've told you. > So, I decide to pre-amplify Tx because it can to reduce the output signal > of the LMS. > Anyway isolation of the PCB seems to be quite higher then inside LMS, I'm > sure. > And also, if I am wrong then we can bypass signal through C108-C109 to > avoid this my mistake. > > Best regards, > Andrey Sviyazov. > > > > 2012/5/30 Jean-Samuel Najnudel - BJT PARTNERS SARL <jsn at bjtpartners.com> > >> Hi Andrey, >> >> Thank you for your e-mail. >> >> This is a great news. Great ideas, great debug, great improvements. >> Thanks a lot. >> >> The board looks fine but I will see in deeper details and let you know. >> >> A question just comes to my mind. >> 20 dBm Tx output is very convenient. This would allow to saturate and >> achieve a very good PA efficiency. This is really nice. >> In case Tx output is 20 dBm are you sure we would not have any PCB Tx >> signal leakage problems ? >> A few months ago, you told me maximum Tx power was around 0 dBm to avoid >> problems. Did you find a solution to improve isolation and allow the 20 dBm >> Tx power ? >> >> Anyway, thanks a lot. Again, the board seems to be really great. This >> would also bring a wonderful tool to the SDR, OpenBTS and OpenBSC >> communities. Thank you so much for this. >> >> Best regards. >> >> Jean-Samuel. >> :-) >> >> >> >> On Tue, May 29, 2012 at 7:59 PM, Andrey Sviyazov <andreysviyaz at gmail.com>wrote: >> >>> Hi all. >>> >>> First of all, Alexander asked me to use UmTRXv2 instead of v1b, so >>> project renamed and I'll send whole project later. >>> Here "What new in UmTRXv2.txt" in addition to fixed of all known >>> UmTRXv1a issues<http://code.google.com/p/umtrx/issues/list?can=1&q=&colspec=ID+Type+Status+Priority+Milestone+Owner+Summary+Modified&cells=tiles> >>> . >>> Unfortunately, a lot physical changes between v1a and v2 and it is very >>> difficult to me to explain all step-by-step in details. >>> But I am ready to patiently answer for any kind of questions. >>> Here also EEpromConfig.SchDoc and BOM files which changed because C298 >>> should be Case-A (issue 18<http://code.google.com/p/umtrx/issues/detail?id=18&can=1&colspec=ID%20Type%20Status%20Priority%20Milestone%20Owner%20Summary%20Modified> >>> ). >>> >>> Best regards, >>> Andrey Sviyazov. >>> >>> >>> >>> 2012/5/29 Andrey Sviyazov <andreysviyaz at gmail.com> >>> >>>> Here PDF's >>>> >>>> Best regards, >>>> Andrey Sviyazov. >>>> >>>> >>>> >>>> 2012/5/29 Andrey Sviyazov <andreysviyaz at gmail.com> >>>> >>>>> 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 >>>>>>> >>>>>> >>>>>> >>>>> >>>> >>> >> > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/umtrx/attachments/20120531/28a460de/attachment.htm>