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In a message dated 10/15/2007 03:51:20 Pacific Daylight Time,
[EMAIL PROTECTED] writes:
>A week ago I made a PayPal Payment ($575.00).
>I heard nothing further.
>Could you confirm this payment?
Hello Renso,
thanks for
Don Collie wrote:
> Hi Hal,
> I was thinking of attaching a temparature sensor [AKA Star Treck] to the
> cold side of a Peltier [what`s the other type? Are they available/better?]
> pile. and driving the pile from the output of some sort of servo loop to
> maintain a temparature of ,say , 0
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This is something I have thought about but never did any experimentation.
With the low cost and increased availability of thermoelectric coolers, I am
interested in pursuing this concept. The unfortunate thing is that the
cr
Hi Rick,
Perhaps I should have said : "Temperature at which the lowest change of
frequency with temperature occurs".
What cut of crystal is used in these high quality crystal references,
please?
Cheers,Don C.
- Original Message -
From:
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As far as I can tell, temperature curve plots for quartz typically
show both an upper and a lower turnover point (for example,
see the pages below). Since the upper is well above maximum
ambient, it makes sense that this point i
Don Collie wrote:
> Yes, you can cut a crystal to have an inversion temp at 25Deg C. [well
> certainly with an AT cut - I`m not sure about the SC cut.]
> Cheers,Don C.
The AT cut has an inflection point at 25 degrees C. You cannot
get a "turnover"
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Hi Hal,
I was thinking of attaching a temparature sensor [AKA Star Treck] to the
cold side of a Peltier [what`s the other type? Are they available/better?]
pile. and driving the pile from the output of some sort of servo l
Hi Enrico,
I accidently deleted your message to me, would you please re-send it to
me. Also, I would like to respond to the points you raise on the group,
please, so could I please have your permission to do this?
Thankingyou,Don C.
__
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Hi:
I've received this unit, but know nothing about it. Need power connector
voltages and pinout, manual or whatever I can find out.
O-1814/GRC-206 Rubidium Frequency Standard
--
Have Fun,
Brooke Clarke
http://www.PRC68.com
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Hal
For a summary of the state of the art in Peltier devices etc see:
ARTI Report No. 10120-01THERMOELECTRIC TECHNOLOGY ASSESSMENT
Final Report May 2007 Dr. Bao Yang
A COP up to 6 or so can be achieved at around room temperatu
> Is there something magic about quartz that has a turnover in the
> region that
> just happens to be handy for OCXOs? Or is it the other way around:
> people
> chose the cut angle to get a temperature that works well for ovens?
First, better heat-only than heat-cool or cool-only because of
-
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Thanks for pointing that out, David. I'll see if I can get Mailman to
change that robot tag (it's automagically created).
John
Dr. David Kirkby said the following on 10/15/2007 05:02 PM:
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Jason Rabel wrote:
>
>> Is there an archive of past digests that I can search
>> for useful tidbits of information?
>>
>
> Yes!!!
>
> http://www.febo.com/pipermail/time-nuts/
>
> I've spent hours on end sifting through t
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> The resonator inversion temperature occurs at 70-80 degrees Celsius,
> depending on the cut angles.
Is there something magic about quartz that has a turnover in the region that
just happens to be handy for OCXOs? Or is it
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Dear all,
the major problem for the use of a Peltier cell with
a quartz oscillator is that the cell maximum operating
temperature is of the order of 80 degrees Celsius.
This is due to the low melting point of the metal pairs
su
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