I attended too. This guy is so theoretical it was kinda hard to put into practical terms but I will say after reading some of his book he does understand some novel ways to calculate what's needed for reaching lower noise levels.
Bill On Tue, Oct 13, 2020, 1:51 PM Attila Kinali <[email protected]> wrote: > On Tue, 13 Oct 2020 12:46:46 -0500 > "Bill Byrom" <[email protected]> wrote: > > > I just attended this webinar. It focused on oscillator design > > theory and the results the author had achieved for various > > specific projects. He discussed in general amplitude limiting to > > reduce amplitude noise, with the result that we only need to worry > > about phase noise in most cases. Very little time was spent on > > atomic clocks - he gave three slides which showed Rubidium > > resonance lines and vapor cells and a block diagram but there was > > little else. He discussed flicker noise but didn't get into the > > physical cause of that phenomenon. He spend a bit of time > > discussing frequency tweaking using varactor phase shifters. > > A couple of notes here: > > Everard is a great practical guy. He knows oscillators and he > knows them well. The papers comming out his group are great > resources on how to build oscillators for various applications. > I haven't had time to read his book yet, but the few pages I > looked at gave a very good impression. If you ever meet him > and have questions, he is very enthusiastic in answering them. > > About flicker noise: over a century after we discovered them, > we still do not understand how it comes to be. A bit simplified, > all we know is that defects increase flicker noise. But beyond > that, we have no idea how defects causes flicker noise. So I > am not surprised he doesn't go into that. > > Similarly, Rb vapor cells are not his business, oscillators and > filters are. He probably had just a project that was used in > an Rb standard, so it's understandable he didn't go into those > details either. > > Overall the presentation was a nice overview of his works. > > Attila Kinali > > -- > <JaberWorky> The bad part of Zurich is where the degenerates > throw DARK chocolate at you. > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
