The problem is there are only a small number of calibration-cache registers, so managing that cache and having the cache management not ALSO contribute to latency issues is problematic.
Sent from my iPhone > On Jan 19, 2021, at 12:56 PM, David Evans via USRP-users > <usrp-users@lists.ettus.com> wrote: > > Hi all, > I am not an expert on this, but recently speaking to someone a little more in > the know than I... > Marcus is right, also it is apparently possible to pre-calibrate in advance > and save the calibration settings to registers on the AD9361, thus making the > tune time constant. > Just a thought, > Cheers, > Dave > > >> On 11/01/2021 13:32, Marcus D Leech via USRP-users wrote: >> This is probably just a quirk of the way the calibrations cache works in the >> AD9361 chip. >> >> The chip isn’t really designed for fast frequency hopping, and when you >> retune, internal recalibrations need to happen on the chip, except for small >> frequency changes. >> >> >> Sent from my iPhone >> >>>> On Jan 11, 2021, at 6:22 AM, Андрей А via USRP-users >>>> <usrp-users@lists.ettus.com> wrote: >>> >>> >>> Hello >>> >>> I testing b200mini in receiver mode and found strange result with tune time >>> . >>> When I start from 100MHz and tune with step 20MHz at freq 200 -> 220 and >>> 120 -> 100 get almost 100 times slowly time then others. >>> When I start form 101MHz time increase only first pass and then all OK. >>> >>> Source code and terminal screenshots in attachments. >>> >>> Thank you >>> >>> <main.c> >>> <Screenshot from 2021-01-11 13-03-09.png> >>> <Screenshot from 2021-01-11 13-03-50.png> >>> _______________________________________________ >>> USRP-users mailing list >>> USRP-users@lists.ettus.com >>> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >> _______________________________________________ >> USRP-users mailing list >> USRP-users@lists.ettus.com >> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com _______________________________________________ USRP-users mailing list USRP-users@lists.ettus.com http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
