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Alexander Chemeris alexander.chemeris at gmail.comJiang, 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