Hi Josh, thanks for the answer, so you confirm times in the range of the hundreds of micro secs? are WBX and SBX the best performing daughterboards in this repsect?
where can I find the ADI docs you quote in your email? thank you and best regards. vince 2012/9/26 Josh Blum <j...@ettus.com> > > > On 09/26/2012 01:00 PM, Vincenzo Pellegrini wrote: > > Dear gr / USRP fellows, > > > > I'm currently experimenting with USRP B100 Local Oscillator relocation > time. > > I've done some experiments on the RX path by tuning towards and away from > > an OFDM beacon signal. > > > > I have flushed into the received signal some recognizable "relocation > > marks" which allowed me to analyze the > > received signal integrity in the temporal vicinity of the relocation > > instant. > > > > It looks like the LO responds to the steering command in some > milliseconds > > to about two tens of millisecs, > > still "artifacts" such as unsuppressed, dominant carrier or unstable gain > > remain there for some hundreds of millisecs. > > > > I saw that the wiki states "perhaps a second" as the LO settling time. > > But can anybody confirm the above behaviour analysis ? > > It depends on the daughterboard. SBX and WBX have a worst case settling > time of about 300us according to the ADI docs. > > You should also be able to schedule tuning through time commands so that > the window of "interruption" is explicitly between time X and X + 300us. > > Here is some psudo code involving using timed commands to tune: > > http://files.ettus.com/uhd_docs/manual/html/sync.html#align-los-in-the-front-end-sbx-wbx-n-series > > > -josh > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > -- Vincenzo Pellegrini http://www.youtube.com/user/wwvince1
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