Could it be microphonic capacitors, or the crystal itself ? Have you got a big old heavy power supply with a buzzing transformer on your workbench ?
On Sun, Feb 28, 2016 at 3:04 PM, Daniel Watson <[email protected]> wrote: > Hi, > > I put one in a freezer and measured the current draw. At -12*C, it drew > about 320 mA steady state (1.6W). > > Dan > > On Sat, Feb 27, 2016 at 7:30 PM, Rob Sherwood. <[email protected]> wrote: > > > The part draws 600 mA during warm-up, and drops to around 230 to 200 mA > > when stabilized. > > Rob > > NC0B > > > > -----Original Message----- > > From: time-nuts [mailto:[email protected]] On Behalf Of Bob > Camp > > Sent: Saturday, February 27, 2016 2:26 PM > > To: Discussion of precise time and frequency measurement > > Subject: Re: [time-nuts] Inside a CTS 1960017 OCXO > > > > > > > > Hi > > > > A small air gap is actually a better insulator than conventional foam. > You > > don’t get much of a convection cell going at those spacings. The part > > likely pulls a bit over a watt at room. > > > > If you put an insulator on the gizmo you increase it’s thermal gain. That > > will most likely make the temperature performance significantly worse. > See > > the good old papers on the HP super ovens for all the details. > > > > Bob > > > > > On Feb 27, 2016, at 12:44 PM, Tom Miller <[email protected]> > > wrote: > > > > > > > > > ----- Original Message ----- From: "Daniel Watson" > > > <[email protected]> > > > To: <[email protected]> > > > Sent: Saturday, February 27, 2016 11:48 AM > > > Subject: [time-nuts] Inside a CTS 1960017 OCXO > > > > > > > > >> Hi, > > >> > > >> I'm sure many of you are tracking the cheap CTS 10MHz OCXOs available > > >> on eBay right now. I purchased a case of them, and decided to crack > one > > open. > > >> I took pictures along the way, thinking that might be interesting to > > >> the list. Here is the blog post if you are interested: > > >> > > >> http://syncchannel.blogspot.com/2016/02/10mhz-ocxo-teardown-cts-19600 > > >> 17.html > > >> > > >> Comments on the internal construction of the OCXO are welcome. It > > >> seems pretty straightforward inside though. > > >> > > >> > > >> Best regards, > > >> > > >> Dan W. > > > > > > Looks like it would use a lot of power in a cold environment. Maybe a > > second oven would be nice. They seem to have marked the turnover temp on > > the xtal. > > > > > > Regards > > > _______________________________________________ > > > 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. > > > > > > > > -- > > If this email is spam, report it to > > > > > https://support.onlymyemail.com/view/report_spam/ODExMjI6MTg1NzM5Mjc1MDpyb2JAbmMwYi5jb206ZGVsaXZlcmVk > > > > _______________________________________________ > > 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.
