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Sylvain Munaut 246tnt at gmail.com> > 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' ? It's not specified. It'll be variable and will most likely be more in the order of milliseconds than microseconds. A much better plan would be to use the two channels of the UmTRX and tune one to Downlink and one to Uplink. Cheers, Sylvain