[time-nuts] Double ovened 10811-60158 on ebay
wb6bnq at cox.net
Sun Jul 20 01:22:22 EDT 2008
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 . . .
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:
> > <196188.8.131.52.152.1216524938.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?
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