Time to Switching Frequence

Sylvain Munaut 246tnt at gmail.com
Fri Jun 7 09:00:19 UTC 2013


>
> 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




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