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Andrey Sviyazov andreysviyaz at gmail.comHi Jiang. Sorry, I missed that you'll use only receivers. So, no any problems in this case. Best regards, Andrey Sviyazov. (Sent from my mobile client) 07.06.2013 14:54 пользователь "Andrey Sviyazov" <andreysviyaz at gmail.com> написал: > Hi Jiang. > > Please remember that Rx and Tx of LMS can't work well at the same > frequency due to PLL's problems. > Also, please do not forget about TxLO leakage which is quite significant. > > Best regards, > Andrey Sviyazov. > (Sent from my mobile client) > 07.06.2013 14:36 пользователь "jiangwy" <wyjiang at ljshuoda.com> написал: > >> ** >> OK. >> Thank you and Sylvain very much! >> >> ------------------------------ >> jiangwy >> >> *From:* Alexander Chemeris <alexander.chemeris at gmail.com> >> *Date:* 2013-06-07 18:12 >> *To:* wyjiang <wyjiang at ljshuoda.com> >> *CC:* UmTRX <umtrx at lists.osmocom.org> >> *Subject:* Re: Time to Switching Frequence >> Jiang, >> >> It's not tested. LMS6002D chip by itself has quite short tuning time, >> but the current host and FPGA code introduce significant delay. I >> can't find exact numbers regarding LMS tuning time, but IIRC it was >> shorter than a GSM timeslot. >> >> So, as Sylvain said, given software limitations it's easier to use two >> channels of UmTRX to receive on two frequencies. >> >> On Fri, Jun 7, 2013 at 11:21 AM, jiangwy <wyjiang at ljshuoda.com> wrote: >> > Hi All, >> > >> >> > I have a project to monitoring ( air sniffer ) the data between GSM BTS and >> > MS using UmTRX. >> > Uplink Transmission is delayed 3 slots than downlink from specification. >> >> > So when I sync. with BTS and get the downlink slot data, I must switch the >> > freqs of receiver from downlink to uplink in less than 2 slots. >> >> > When the program call 'usrp_dev->set_rx_freq(wFreq)', How much time does the >> > UmTRX switch to the 'wFreq' ? >> > >> > Thanks in advance. >> > >> > ________________________________ >> > Jiang WenYi >> >> >> >> -- >> 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/20130607/a87a5aa6/attachment.htm>