Hi Jean-Samuel.<div><br></div><div><div>Unfortunately nobody can say about isolation between Tx and Rx of the LMS6002 chip, about which I've told you.</div><div>So, I decide to pre-amplify Tx because it can to reduce the output signal of the LMS.</div>
<div>Anyway isolation of the PCB seems to be quite higher then inside LMS, I'm sure.</div><div>And also, if I am wrong then we can bypass signal through C108-C109 to avoid this my mistake.</div></div><div><br></div><div>
Best regards,<div>Andrey Sviyazov.</div><br>
<br><br><div class="gmail_quote">2012/5/30 Jean-Samuel Najnudel - BJT PARTNERS SARL <span dir="ltr"><<a href="mailto:jsn@bjtpartners.com" target="_blank">jsn@bjtpartners.com</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hi Andrey,<br><br>Thank you for your e-mail.<br><br>This is a great news. Great ideas, great debug, great improvements. Thanks a lot.<br><br>The board looks fine but I will see in deeper details and let you know.<br><br>A question just comes to my mind.<br>
20 dBm Tx output is very convenient. This would allow to saturate and achieve a very good PA efficiency. This is really nice.<br>In case Tx output is 20 dBm are you sure we would not have any PCB Tx signal leakage problems ?<br>
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 ?<br><br>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.<br>
<br>Best regards.<br><br>Jean-Samuel.<br>:-)<div class="HOEnZb"><div class="h5"><br><br><br><div class="gmail_quote">On Tue, May 29, 2012 at 7:59 PM, Andrey Sviyazov <span dir="ltr"><<a href="mailto:andreysviyaz@gmail.com" target="_blank">andreysviyaz@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div>Hi all.</div><div><br></div><div>First of all, Alexander asked me to use UmTRXv2 instead of v1b, so project renamed and I'll send whole project later.</div>
Here "What new in UmTRXv2.txt" inšaddition to fixed of all known UmTRXv1aš<a href="http://code.google.com/p/umtrx/issues/list?can=1&q=&colspec=ID+Type+Status+Priority+Milestone+Owner+Summary+Modified&cells=tiles" target="_blank">issues</a>.<div>
<div>Unfortunately, a lot physical changes between v1a and v2 and it is very difficult to me to explain all step-by-step in details.</div><div>But I am ready to patiently answer for any kind of questions.</div><div>Here also EEpromConfig.SchDoc and BOM files which changed because C298 should be Case-A (<a href="http://code.google.com/p/umtrx/issues/detail?id=18&can=1&colspec=ID%20Type%20Status%20Priority%20Milestone%20Owner%20Summary%20Modified" target="_blank">issue 18</a>).</div>
<div><div>
<div><br clear="all">Best regards,<div>Andrey Sviyazov.</div><br>
<br><br><div class="gmail_quote">2012/5/29 Andrey Sviyazov <span dir="ltr"><<a href="mailto:andreysviyaz@gmail.com" target="_blank">andreysviyaz@gmail.com</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Here PDF's<div><div><div><br clear="all">Best regards,<div>Andrey Sviyazov.</div><br>
<br><br><div class="gmail_quote">2012/5/29 Andrey Sviyazov <span dir="ltr"><<a href="mailto:andreysviyaz@gmail.com" target="_blank">andreysviyaz@gmail.com</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Here PCB file of project.<div><br clear="all">Best regards,<div>Andrey Sviyazov.</div><div><div><br>
<br><br><div class="gmail_quote">2012/5/29 Andrey Sviyazov <span dir="ltr"><<a href="mailto:andreysviyaz@gmail.com" target="_blank">andreysviyaz@gmail.com</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hi all.<div><br></div><div>First release of UmTRXv1b seems finished.š</div><div>All suggestions and issues are welcomed, especially prior to production (few days).š</div><div>There are 4 Rx inputs to implement either scan function or software diversity receiving.</div>
<div>There are 16pin connector to supply and control external preselector, amplifier, LNA, ATT, diversity switch...</div><div><div>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.š</div>
<div>Also possible variant to meet to requirements -40C and it is the only one reason to keep OCVCXO onboard.š</div><div>Also possible variant with external control panel to make easily IP65 housing design.š</div><div>Also DC supply voltage can be in range 8..28V to keep single DC supply if UmTRX will combined with IP65 tower mounted amplifiers.</div>
<br></div><div>And so on depend of your fantasy :)</div><div><br></div><div><div>Here includedšsomešproject files and BOM for variant with 20dBm Tx and onboard control.š</div><div>PCB and PDF files will be in the next two e-mails.š</div>
<br>Best regards,<div>Andrey Sviyazov.</div><div><div><br>
<br><br><div class="gmail_quote">2012/5/21 Alexander Chemeris <span dir="ltr"><<a href="mailto:alexander.chemeris@gmail.com" target="_blank">alexander.chemeris@gmail.com</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Andrey,<br>
<div><br>
On Sun, May 20, 2012 at 6:46 PM, Andrey Sviyazov <<a href="mailto:andreysviyaz@gmail.com" target="_blank">andreysviyaz@gmail.com</a>> wrote:<br>
> 1) Is it used somewhere? In the datasheet there is probable errors, for<br>
> example, 1PPS is specified as input.<br>
<br>
</div>Use this datasheet, here it's marked as output:<br>
<a href="http://www.transystem.com.tw/product/66/EB-570%20Data%20Sheet%20V1.4.pdf" target="_blank">http://www.transystem.com.tw/product/66/EB-570%20Data%20Sheet%20V1.4.pdf</a><br>
Probably you have an older version of the datasheet.<br>
<div><br>
> 2) There are inputs Reset and Standby. The first can be left open, and the<br>
> second is possible need to be connected to to FPGA.<br>
<br>
</div>Yes.<br>
<div><br>
> 3) There Is RTC_CLK_O we don't need him? And that there may be, 32768?<br>
<br>
</div>Could you route it to a test-point or a 2-pin IDC? I don't think we<br>
need this, but it's better to have an ability to access it.<br>
<div><br>
> 4) Which of two UART's better to use or are they equivalent? There are no<br>
> any words in datasheet about it.<br>
<br>
</div>Use TX0/RX0 (pins 13/14), which is default to NMEA - see the datasheet above.<br>
<div><br>
> 5) Unfortunately no place for both on PCB and we can use either EB-230 or<br>
> EB-570.<br>
<br>
</div>Then we have to use EB-570.<br>
<span><font color="#888888"><br>
<br>
--<br>
Regards,<br>
Alexander Chemeris.<br>
CEO, Fairwaves LLC / ïïï õÍòÁÄÉÏ<br>
<a href="http://fairwaves.ru" target="_blank">http://fairwaves.ru</a><br>
</font></span></blockquote></div><br></div></div></div>
</blockquote></div><br></div></div></div>
</blockquote></div><br></div>
</div></div></blockquote></div><br></div></div></div></div>
</blockquote></div><br>
</div></div></blockquote></div><br></div>