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<DIV>Hi Andrey.</DIV>
<DIV> </DIV>
<DIV>I see. But what's the TxLO leakage?</DIV>
<DIV> </DIV>
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<DIV><SPAN>jiangwy</SPAN></DIV>
<DIV> </DIV>
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<DIV><B>From:</B> <A href="mailto:andreysviyaz@gmail.com">Andrey
Sviyazov</A></DIV>
<DIV><B>Date:</B> 2013-06-07 19:14</DIV>
<DIV><B>To:</B> <A href="mailto:wyjiang@ljshuoda.com">wyjiang</A></DIV>
<DIV><B>CC:</B> <A href="mailto:umtrx@lists.osmocom.org">umtrx</A>; <A
href="mailto:alexander.chemeris@gmail.com">Chemeris Alexander</A></DIV>
<DIV><B>Subject:</B> Re: Re: Time to Switching Frequence</DIV></DIV></DIV>
<DIV>
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<P dir=ltr>Hi Jiang.</P>
<P dir=ltr>Sorry, I missed that you'll use only receivers.<BR>So, no any
problems in this case.</P>
<P dir=ltr>Best regards,<BR>Andrey Sviyazov. <BR>(Sent from my mobile
client)</P>
<DIV class=gmail_quote>07.06.2013 14:54 пользователь "Andrey Sviyazov" <<A
href="mailto:andreysviyaz@gmail.com">andreysviyaz@gmail.com</A>> написал:<BR
type="attribution">
<BLOCKQUOTE class=gmail_quote
style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
<P dir=ltr>Hi Jiang.</P>
<P dir=ltr>Please remember that Rx and Tx of LMS can't work well at the same
frequency due to PLL's problems.<BR>Also, please do not forget about TxLO
leakage which is quite significant. </P>
<P dir=ltr>Best regards,<BR>Andrey Sviyazov. <BR>(Sent from my mobile
client)</P>
<DIV class=gmail_quote>07.06.2013 14:36 пользователь "jiangwy" <<A
href="mailto:wyjiang@ljshuoda.com" target=_blank>wyjiang@ljshuoda.com</A>>
написал:<BR type="attribution">
<BLOCKQUOTE class=gmail_quote
style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid"><U></U>
<DIV style="MARGIN: 10px">
<DIV>OK.</DIV>
<DIV>Thank you and Sylvain very much!</DIV>
<DIV> </DIV>
<HR style="MIN-HEIGHT: 1px; WIDTH: 210px" align=left color=#b5c4df SIZE=1>
<DIV><SPAN>jiangwy</SPAN></DIV>
<DIV> </DIV>
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<DIV><B>From:</B> <A href="mailto:alexander.chemeris@gmail.com"
target=_blank>Alexander Chemeris</A></DIV>
<DIV><B>Date:</B> 2013-06-07 18:12</DIV>
<DIV><B>To:</B> <A href="mailto:wyjiang@ljshuoda.com"
target=_blank>wyjiang</A></DIV>
<DIV><B>CC:</B> <A href="mailto:umtrx@lists.osmocom.org"
target=_blank>UmTRX</A></DIV>
<DIV><B>Subject:</B> Re: Time to Switching Frequence</DIV></DIV></DIV>
<DIV>
<DIV>Jiang,</DIV>
<DIV> </DIV>
<DIV>It's not tested. LMS6002D chip by itself has quite short tuning time,</DIV>
<DIV>but the current host and FPGA code introduce significant delay. I</DIV>
<DIV>can't find exact numbers regarding LMS tuning time, but IIRC it was</DIV>
<DIV>shorter than a GSM timeslot.</DIV>
<DIV> </DIV>
<DIV>So, as Sylvain said, given software limitations it's easier to use two</DIV>
<DIV>channels of UmTRX to receive on two frequencies.</DIV>
<DIV> </DIV>
<DIV>On Fri, Jun 7, 2013 at 11:21 AM, jiangwy <<A
href="mailto:wyjiang@ljshuoda.com"
target=_blank>wyjiang@ljshuoda.com</A>> wrote:</DIV>
<DIV>> Hi All,</DIV>
<DIV>></DIV>
<DIV>> I have a project to monitoring ( air sniffer ) the data between GSM BTS and</DIV>
<DIV>> MS using UmTRX.</DIV>
<DIV>> Uplink Transmission is delayed 3 slots than downlink from specification.</DIV>
<DIV>> So when I sync. with BTS and get the downlink slot data, I must switch the</DIV>
<DIV>> freqs of receiver from downlink to uplink in less than 2 slots.</DIV>
<DIV>> When the program call 'usrp_dev->set_rx_freq(wFreq)', How much time does the</DIV>
<DIV>> UmTRX switch to the 'wFreq' ?</DIV>
<DIV>></DIV>
<DIV>> Thanks in advance.</DIV>
<DIV>></DIV>
<DIV>> ________________________________</DIV>
<DIV>> Jiang WenYi</DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV>-- </DIV>
<DIV>Regards,</DIV>
<DIV>Alexander Chemeris.</DIV>
<DIV>CEO, Fairwaves LLC / ООО УмРадио</DIV>
<DIV><A href="http://fairwaves.ru"
target=_blank>http://fairwaves.ru</A></DIV></DIV></DIV></BLOCKQUOTE></DIV></BLOCKQUOTE></DIV></DIV></DIV></BODY></HTML>