Hi, surely an oven that controls to 1*C limits the inner xtal oven from the outside 0 - 50*C, so with a finite gain on the inner oven the oven the XTAL is controlled 50 times as well? Thats why they use double ovens.
cheers, Neville Michie On 20/07/2008, at 1:40 PM, Rick Karlquist wrote: > Ed Palmer wrote: >> Bill, >> >> I picked up a couple of these 'naked' oscillators. I was >> surprised to >> hear that you stripped yours down. I'm planning to build it back >> up to >> its former glory with a controller for the outer oven and a new >> cover of >> some sort. Is there any reason not to do that? > > The possible reason is that the oven thermal gain isn't all that > great (AFAIK), so you go to fair amount of trouble for marginal > benefits. You will probably have to use a very long time constant > which will sort of rule out a simple analog integrator, forcing > a PID digital controller. If you're good with a PIC, it might not > be too hard. I'm an analog guy; I don't speak PIC. :-) > > Rick Karlquist N6RK > >> >> Thanks, >> Ed >> >>> Date: Sat, 19 Jul 2008 17:33:07 -0400 >>> From: wje <[EMAIL PROTECTED]> >>> Subject: Re: [time-nuts] Double ovened 10811-60158 on ebay >>> To: Discussion of precise time and frequency measurement >>> <[email protected]> >>> Message-ID: <[EMAIL PROTECTED]> >>> Content-Type: text/plain; charset="ISO-8859-1" >>> >>> I got one without the outer cover, which isn't quite as useful. I >>> removed all the junk to get down to the orginal non-double-ovened >>> osc. >>> One thing I noticed - I wonder where these were actually >>> deployed? >>> The >>> 10811B itself has a fair amount of corrosion on it, lots of >>> pitting. >>> It >>> still works fine, though. >>> Another thing, the 10811B in mine doesn't have a removable >>> endplate, >>> it's soldered. This makes it a lot more difficult to adjust or >>> repair. >>> Still, I think it's a fine buy for the cost. Now all I have to >>> do is >>> figure out what I really want to do with it. :) >>> Bill Ezell >>> ---------- >>> They said 'Windows or better' >>> so I used Linux >> >> >> _______________________________________________ >> 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. _______________________________________________ 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.
