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Bruce,
Great!
Henk
On Nov 8, 2007, at 22:11, Bruce Griffiths wrote:
> Henk ten Pierick wrote:
>> On Nov 6, 2007, at 22:43, Bruce Griffiths wrote:
>>
>>
>>> NIST's AC standard is currently useful for generating frequencies
>
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Anyone want a scanned copy of a 10544B datasheet?
Bruce
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Hi,
I've built a GPSDO using an Isotemp 10MHz OCXO (134-10) as available on
eB*y a while back.
The OCXO seems to be very slow to respond to changes in the control
voltage. I assume there is an internal RC filter or similar
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Hal Murray <[EMAIL PROTECTED]> wrote:
> What's the cycle time of a typical bang-bang air conditioner cooling a
room
> full of computers?
Modern data centers that are well run are controlled by much more
sophisticated control l
[EMAIL PROTECTED] wrote:
> Hi Bruce,
>
> yes an opamp or two and a microprocessor or two can do the tempco
> compensation of course.
>
> The point of my post was that if carefully matched, this change of EFC
> voltage versus heater-current/temperature can actually be designed to cancel
> o
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In a message dated 11/8/2007 17:57:09 Pacific Standard Time,
[EMAIL PROTECTED] writes:
>With some ingenuity and an opamp or 2, either sign can easily be be
>accommodated.
>Using a length of PCB track for the current sens
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[EMAIL PROTECTED] wrote:
> Hi guys,
>
> here is a thought: why not use EFC parasitic ground current loops to cancel
> out OCXO Tempco?
> ___
>
> Most single oven heaters will have a significant tempco.
>
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In a message dated 11/8/2007 16:34:16 Pacific Standard Time,
[EMAIL PROTECTED] writes:
>12V supply. The thin wire has no heater current in it so all heater current
>drives the OXCO ground pin a fraction of a mV below th
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>How do you distinguish this effect from oven temperature variations due
>to finite thermal gain, particularly with a single oven OCXO?
>For small changes the effects are both linear.
Bruce many OXCO have an internal voltage r
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Hal Murray wrote:
>> An illustration of what I meant would be what happens when someone
>> opens the door to the lab where the GPSDO is located. The room
>> temperature may change by a few degrees over a few minutes time,
>> cau
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Henk ten Pierick wrote:
> On Nov 6, 2007, at 22:43, Bruce Griffiths wrote:
>
>
>> NIST's AC standard is currently useful for generating frequencies
>> up to
>> 100kHz with 10MHz the projected useful limit for a 10Gb/s bit s
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On Nov 6, 2007, at 22:43, Bruce Griffiths wrote:
> NIST's AC standard is currently useful for generating frequencies
> up to
> 100kHz with 10MHz the projected useful limit for a 10Gb/s bit stream.
> With say a 1Mb/s bit stre
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> An illustration of what I meant would be what happens when someone
> opens the door to the lab where the GPSDO is located. The room
> temperature may change by a few degrees over a few minutes time,
> causing the oven to kick
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This is interesting.
I would like to setup a data logger on a 10811 (with EFC grounded) and record
the oven current as well as the output from a 5370 comparing the 10811 to my
Thunderbolt and the temperature in my shack. Temp
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An illustration of what I meant would be what happens when someone opens the
door to the lab where the GPSDO is located. The room temperature may change by
a few degrees over a few minutes time, causing the oven to kick in (or
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Peter Schmelcher wrote:
>> Is the worry, then, about the minor ambient temperature related
>> variations in steady-state oven current? Or something else?
>>
>
> Tom the problem is easy to observe by cooling the OXCO with a
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>Is the worry, then, about the minor ambient temperature related
>variations in steady-state oven current? Or something else?
Tom the problem is easy to observe by cooling the OXCO with a fan and
watching the EFC change.
I li
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