[time-nuts] 10811 foam enclosure

[lists at lazygranch.com]

Designers want good enough at the lowest cost. This oven design sounds complicated. 
-----Original Message-----
From: "William H. Fite" <omniryx at gmail.com>
Sender: time-nuts-bounces at febo.com
Date: Mon, 10 Jan 2011 14:04:20 
To: <richard at karlquist.com>; Discussion of precise time and frequency measurement<time-nuts at febo.com>
Reply-To: Discussion of precise time and frequency measurement
	<time-nuts at febo.com>
Subject: Re: [time-nuts] 10811 foam enclosure

It is perhaps wise to remind ourselves at this point that the designers'
approach was "good enough" whereas the typical time-nut's approach is "as
good as it can possibly be."




On Mon, Jan 10, 2011 at 1:58 PM, Rick Karlquist <richard at karlquist.com>wrote:

> Bob Camp wrote:
> the story to remember that sort of detail.
> >
> > I've never seen any frequency vs temperature data on the "double oven"
> > 10811's that shows they are significantly better than a normal part. HP
> > apparently never published any data. They also never used the approach
> > again, despite it's being pretty cheap to build (added parts cost).
> > Looking
> > at the design, it likely isn't a very low gradient device...
>
> The whole 10811 double oven effort was in the "expediency" category.
> It was done by people who knew little about oven design and
> didn't have time to learn.  Out of curiosity I kept tabs on
> the design, and what I saw made me cringe.  There was an absurd wrapping
> of coax and flex circuits to try to reduce conductive heat leaks.  I guess
> they blundered their way to some kind of a design that worked good enough
> to ship product.  It is not much of a proof or disproof of the 10811
> double oven concept.  As they say, it is what is it.
>
> Rick Karlquist N6RK
>
>
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