> -----Original Message----- > From: time-nuts-boun...@febo.com [mailto:time-nuts- > boun...@febo.com] On Behalf Of Tom Knox > Sent: Sunday, February 26, 2012 9:41 AM > To: time-nuts@febo.com > Subject: Re: [time-nuts] Morion MV89A Repair > > > Is this the paper you are speaking of? > Google: Optimization of Drive-Level in High Stability Low-Noise OCXOs > > Thomas Knox
That's not the one Bob (and I) was talking about, but there are some interesting contradictions between the paper you mentioned: http://www.magicxtal.com/articles/Optimization%20of%20Drive-Level%20in%20Hig h%20Stability%20Low-Noise%20OCXOs.PDF and Rakon's article: http://www.rakon.com/Products/Public%20Documents/Whitepapers/PHASE%20NOISE%2 0IN%20CRYSTAL%20OSCILLATORS.pdf The Rakon author states that the flicker and white PM regions, including the broadband floor, are influenced by factors other than the crystal (Figure 9). Meanwhile, the Russian authors of the first paper state repeatedly that the broadband noise floor is a function of the crystal current, and that close-in noise isn't affected by crystal current. It's obvious enough that high levels of crystal current are bad for long-term stability and aging, but it's not as easy to see why high crystal current in itself should rule out a good broadband noise floor. There are a lot of assertions in the literature, especially in the magicxtal.com paper, that are backed up by measurements but not by solid analysis. -- john _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
