[time-nuts] Double ovened 10811-60158 on ebay

[WB6BNQ]

Did it occur to anyone that possibly these units where intended to be used in
some very cold country, like the top of Alaska or some similar place wheere a
little additional help was necessary ? ? ?

Just a thought . . .

Bill....WB6BNQ


Ed Palmer wrote:

> > Date: Sat, 19 Jul 2008 20:35:38 -0700 (PDT)
> > From: "Rick Karlquist" <richard at karlquist.com>
> > Subject: Re: [time-nuts] Double ovened 10811-60158 on ebay
> > To: "Discussion of precise time and frequency measurement"
> >       <time-nuts at febo.com>
> > Message-ID:
> >       <19613.69.12.192.152.1216524938.squirrel at webmail.sonic.net>
> > Content-Type: text/plain;charset=iso-8859-1
> >
> > Mike S wrote:
> >
> >> At 05:33 PM 7/19/2008, wje wrote...
> >>
> >>>  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.
> >>>
> >> Well, yea. Maybe Rick Karlquist will pipe in, but I believe that (other
> >> than temperature, which is obviously well controlled by a double oven),
> >> pressure/humidity are the biggest instability factors. Soldering the
> >> case closed mitigates that.
> >>
> >
> > Right.  Without hermetic sealing, the double oven would be negated
> > by humidity effects.  I tried to discover exactly what component
> > was the major humidity "sensor" in the 10811, but was never able
> > to narrow it down to anything specific.  The crystal is not the
> > humidity sensor because it is hermetic in its own package, even in
> > the non-hermetic 10811.
> >
> > Rick Karlquist N6RK
> >
> If their intent was to hermetically seal the oscillator, why would they
> leave the screw in the front that covers the adjustment hole (which
> nobody could possibly get to!)?  Would the seal around the screw be good
> enough to make it worth the effort to seal the rest of the unit?
>
> Ed
>
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