OK. Thank you and Sylvain very much!
jiangwy
From: Alexander Chemeris Date: 2013-06-07 18:12 To: wyjiang CC: UmTRX 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@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