Hi It's not that the TBolt is noisy, it's that good phase noise is a whole lot of db down. If you look at the posted plots, there is a lot of digital crud in them even with a good supply. The TBolt innards are the most likely source.
Bob On Aug 20, 2010, at 1:00 PM, "Mark J. Blair" <[email protected]> wrote: > > On Aug 20, 2010, at 5:07 AM, Bob Camp wrote: >> The TBolt OCXO does have good noise characteristics. Unfortunately you have >> to pull it out of the unit to figure that out. > > Is its phase noise substantially worse when it's in the unit? I.e., is the > rest of the TBolt adding a lot of phase noise to its output via its power > and/or tuning voltages? > > I'm powering my TBolt with an HP 6236B bench supply rather than the cheap > open-frame switcher that came with it. Based on what I read, powering the > TBolt with a switcher adds a lot of noise/spurs to the OCXO spectrum. My unit > has the Trimble-marked OCXO, which I gather is supposed to be a lot better > than the Piezo-marked one. My TBolt is presently just screwed onto the top > cover of the 6236B, which is probably far from optimal. I have the whole > setup installed in a closet, so at least it doesn't get nailed with a blast > of cold air every time the air conditioner turns on. > > > > -- > Mark J. Blair, NF6X <[email protected]> > Web page: http://www.nf6x.net/ > GnuPG public key available from my web page. > > > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
