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(a)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