[time-nuts] Morion MV89A pics

[Bob Camp]

Hi

A double oven should be one oven inside another oven. To count as an oven,
you need a surface to heat, heaters, a temp sensor, and a controller.
Insulation also comes in handy. You can indeed to multi zone heaters, but
that's not the way a double oven works. 

The enclosure in the MV89 pictures should be the outer oven. Inside that
there likely is another set of heaters and past that the crystal. The
enclosure appears to be soldered shut. Further investigation is likely to
trash the unit. Of course if somebody has one they hooked up backwards on
the supply...

Bob

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Azelio Boriani
Sent: Monday, February 13, 2012 4:51 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Morion MV89A pics

I have always thought the space inside the cover was the outer oven... now
I realize this is not quite correct but then the MV201, specified as a
double-oven, can't be a double-oven. The MV201 has the crystal under a sort
of Stonenge-like open structure: if this structure is the inner oven then
the outer oven must be the cover. If the cover is the cover then this
structure is the only oven and the MV201 can't be a double oven OCXO... I
have an MV201 open right now: can take pictures.

On Mon, Feb 13, 2012 at 2:28 AM, Tom Knox <actast at hotmail.com> wrote:

>
> Hi Gang;
> You most likely have this link to Morion with data sheets on all their
> oscillators, but if you don't:
> http://www.morion.com.ru/eng/oscillators/ocxo/
>
> Best Wishes;
> Thomas Knox
>
>
>
> > Date: Sun, 12 Feb 2012 19:11:11 -0600
> > To: time-nuts at febo.com
> > From: newell+timenuts at n5tnl.com
> > Subject: Re: [time-nuts] Morion MV89A pics
> >
> > At 05:45 PM 2/12/2012, Sam wrote:
> > >Thanks for the pictures Scott, it was interesting to see under the
> > >shell of these.
> > >I wasn't expecting the inside to look so "hand made".
> >
> > Yep.  Some of the surface mount components appear to be hand
> > soldered.  I was a little surprised that there was no mechanical
> > frequency trim.  Wonder if it's an AT or SC cut rock--anyone know?
> >
> > --
> > newell  N5TNL
> >
> >
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