[time-nuts] Re: PICDIV stability (was: Crystal oscillator for a begginer)

[Bob kb8tq]

Hi

Milk jugs full of water work pretty well for added thermal mass. 
For some odd reason the typical fridge seems to be able to “accept”
a number of them …..

A small fan to keep the air moving and knock down gradient based
issues is a relatively cheap improvement. 

Bob

> On Jan 8, 2022, at 4:25 PM, Poul-Henning Kamp <phk at phk.freebsd.dk> wrote:
> 
> --------
> Attila Kinali writes:
> 
>> Oh.. and if anyone is going to build a DIY oven for some instruments, a 55x35x30cm
>> styrofoam box with 2cm wall thickness, suspended in air has a thermal resistance of
>> approximately 3K/W. But beware that proper seating of the lid is quite critical as
>> that alone can drop the thermal resistance by a factor of 3 (guess how I know).
> 
> Sorry for repeating myself about this:
> 
> If you want a good thermally stable enclosure, pick and old freezer
> or fridge, leave it unplugged, add as many bricks as you can for
> thermal mass and get on with the fun stuff...
> 
> They come in all sizes, have well designed door closing mechanisms
> and can often be had for free, when a working compressor is not
> needed.
> 
> If you need active temperature control, get somebody with the proper
> kit to suck the gas out, and run water through the nice plumbing
> already installed.
> 
> 
> -- 
> Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
> phk at FreeBSD.ORG         | TCP/IP since RFC 956
> FreeBSD committer       | BSD since 4.3-tahoe    
> Never attribute to malice what can adequately be explained by incompetence.
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