[time-nuts] Inside a CTS 1960017 OCXO

Daniel Watson watsondaniel3 at gmail.com
Sun Feb 28 10:04:43 EST 2016


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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