[time-nuts] Inside a CTS 1960017 OCXO

Adrian Godwin artgodwin at gmail.com
Sun Feb 28 13:22:21 EST 2016


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 <watsondaniel3 at gmail.com>
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. <rob at nc0b.com> 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:time-nuts-bounces at febo.com] 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 <tmiller11147 at verizon.net>
> > wrote:
> > >
> > >
> > > ----- Original Message ----- From: "Daniel Watson"
> > > <watsondaniel3 at gmail.com>
> > > To: <time-nuts at febo.com>
> > > 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
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