See:
http://www.walgreens.com/store/catalog/Accessories/Kool-Kaddy-12V-Cooler/ID=prod1833617&navCount=0&navAction=push-product
<http://www.walgreens.com/store/catalog/Accessories/Kool-Kaddy-12V-Cooler/ID=prod1833617&navCount=0&navAction=push-product>
located using search term:
cooler
using the search term
thermoelectric
is even better
Bruce
Richard W. Solomon wrote:
Can you be a little more specific about the cooler ? Walgreens
search function is rather laborious and clumsy.
Tnx, Dick, W1KSZ
-----Original Message-----
From: "J. Forster"<j...@quik.com>
Sent: Dec 24, 2009 6:58 PM
To: Discussion of precise time and frequency measurement<time-nuts@febo.com>
Subject: Re: [time-nuts] Cheap Rubidium (heatpipe cooling for)
That's why I've been suggesting active control with TE devices.
You can buy a small TE cooler at Walgreens for about $20. It's big enough
for a 6-pack of Coke cans and already comes in an insulated box. Add a
simple temperature control in series w/ the DC supply and you should be
well on the way.
-John
=================
Hi
The original intent was to simply take an existing "cheap" rubidium and do
simple things to it. Tearing it into pieces and redesigning parts of it
was not anything I originally contemplated. The tight integration of the
physics package to the electronics would make this a fairly involved
process.
Bob
On Dec 24, 2009, at 5:42 PM, Magnus Danielson wrote:
Hal Murray wrote:
A heat pipe might work if the fluid had a sufficiently low boiling
point. The rubidium isn't terribly tolerant of high temperatures, and
I'm going to pick up some heat rise as I put it inside some baffles /
shields. You need to find something that fits a fairly narrow window.
This is all backwards.
The main reason the typical Rubidium box needs a serious heat sink is
that there is an active heater inside it heating up the lamp to get it
up to operating temperature. That part of the system better be
"tolerant" of high (enough) temperature.
... or a less heat-producing alternative could be used. The
Rubidium-lamp produces two wavelengths of which one is filtered by a
Rubidium-filter which leaves the final pumping wavelength. This is what
a laser diode could supply instead.
Maybe things would be a lot better/simpler if the heating/cooling we
have been discussing were split into two sections. One for the lamp
assembly, and a second for the electronics.
Most of the discussion has been on thermal isolation of the entier
units. Not what needs generates temperature and what requires
temperature stability etc.
Anybody know what the thermal coefficient of the lamp is relative to
the electronics?
I am not sure I know what you mean by this...
Cheers,
Magnus
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