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Neon John wrote:
> Nah, not for this application. A Peltier module typically has a COP of 1.
> That is,
> it moves a watt of energy for each watt consumed. Thus, for each watt
> moved, two
> watts have to be dissipated t
Brooke Clarke wrote:
> Hi Bruce:
>
> Details on your experiment please.
> Hole/pipe diameter, material?
> Depth?
> Delta T at different depths vs surface ambient?
> Soil type?
>
>
> Have Fun,
>
> Brooke Clarke
>
Brooke
Unable as yet to find my data, it was published in some very obscure
publica
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Brooke Clarke wrote:
> Hi Bruce:
>
> Details on your experiment please.
> Hole/pipe diameter, material?
> Depth?
> Delta T at different depths vs surface ambient?
> Soil type?
>
>
> Have Fun,
>
> Brooke Clarke
>
Booke
I will
Hi Bruce:
Details on your experiment please.
Hole/pipe diameter, material?
Depth?
Delta T at different depths vs surface ambient?
Soil type?
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.precisionclock.com
http://www.prc68.com/I/WebCam2.shtml 24/7 Sky-Weather-Astronomy Cam
Bruce Gri
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Brooke Clarke wrote:
> Hi Bruce:
>
> I've also looked into drilling a hole (garden hose, 90 deg fitting & pipe
> with
> end smashed flat to make a nozzle will easily drill as deep as the pipe is
> long). Then using a short l
Thanks for that John. I`ve always wanted to play arround with one of these
[Peltier] modules. They can now be bought quite cheaply. I envisage a double
oven, with the inner oven heated [to 25 degrees], by conventional means,
while the Peltier pile cools the inner oven. This way you could use
a p
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Hi Dick:
From what I can Google he built maybe the first parametric amplifier but
haven't come across details on the crystal temp stabilization. Do you have
info about that?
Because of the year involved I think he must hav
I doug up and included below a time-nuts email from a couple of years
ago on improving oscillator stability, with some thoughts from Jack
Kusters, Tom Clark, and Brooke Clarke.
Also, there's a good history of high precision oscillators at:
http://www.ieee-uffc.org/fc_history/norton.html
Regard
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Hi Bruce:
I've also looked into drilling a hole (garden hose, 90 deg fitting & pipe with
end smashed flat to make a nozzle will easily drill as deep as the pipe is
long). Then using a short length of capped copper pipe at th
Sam Harris (SK) did that over 40 years ago. It provided a stable
reference for his pioneering work in Moonbounce Communication.
73, Dick, W1KSZ/7
-Original Message-
>From: Bruce Griffiths <[EMAIL PROTECTED]>
>Sent: Oct 13, 2007 2:44 PM
>To: Discussion of precise time and frequency measure
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"Don Collie" <[EMAIL PROTECTED]> wrote:
> Has anyone concidered using a small Peltier pile to maintain the crystal`s
> temparature. I understand that these devices will heat or cool, so it would
> be possible to maintain the c
Brooke Clarke wrote:
> Hi Don:
>
> They are very inefficient to the point that a system that's supposed to cool
> something may heat it because of all the heat generated by the module.
>
> It takes a huge amount of heat sinking or liquid cooling to get them to work.
>
> Have Fun,
>
> Brooke Clarke
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Nah, not for this application. A Peltier module typically has a COP of 1.
That is,
it moves a watt of energy for each watt consumed. Thus, for each watt moved,
two
watts have to be dissipated to air.
I can't imagine a wel
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Brooke Clarke wrote:
> Hi:
>
> Something I've been thinking about is attaching a large thermal mass of
> aluminum to the crystal and it's oscillator then surrounding that with
> insulation. Then surround that with a thin copp
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Hi:
Something I've been thinking about is attaching a large thermal mass of
aluminum to the crystal and it's oscillator then surrounding that with
insulation. Then surround that with a thin copper layer. Temperature sensors
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Hi Don:
They are very inefficient to the point that a system that's supposed to cool
something may heat it because of all the heat generated by the module.
It takes a huge amount of heat sinking or liquid cooling to get them
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Has anyone concidered using a small Peltier pile to maintain the crystal`s
temparature. I understand that these devices will heat or cool, so it would
be possible to maintain the crystal temparature at , say, 25 degrees
celci
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