[time-nuts] Double ovened 10811-60158 on ebay

[Neville Michie]

Hi,
surely an oven that controls to 1*C limits the inner xtal oven from  
the outside 0 - 50*C,
so with a finite gain on the inner oven the oven the XTAL is  
controlled 50 times as well?
Thats why they use double ovens.

cheers, Neville Michie


On 20/07/2008, at 1:40 PM, Rick Karlquist wrote:

> Ed Palmer wrote:
>> Bill,
>>
>> I picked up a couple of these 'naked' oscillators.  I was  
>> surprised to
>> hear that you stripped yours down.  I'm planning to build it back  
>> up to
>> its former glory with a controller for the outer oven and a new  
>> cover of
>> some sort.  Is there any reason not to do that?
>
> The possible reason is that the oven thermal gain isn't all that
> great (AFAIK), so you go to fair amount of trouble for marginal
> benefits.  You will probably have to use a very long time constant
> which will sort of rule out a simple analog integrator, forcing
> a PID digital controller.  If you're good with a PIC, it might not
> be too hard.  I'm an analog guy; I don't speak PIC. :-)
>
> Rick Karlquist N6RK
>
>>
>> Thanks,
>> Ed
>>
>>> Date: Sat, 19 Jul 2008 17:33:07 -0400
>>> From: wje <wje at quackers.net>
>>> Subject: Re: [time-nuts] Double ovened 10811-60158 on ebay
>>> To: Discussion of precise time and frequency measurement
>>> 	<time-nuts at febo.com>
>>> Message-ID: <48825D93.2060101 at quackers.net>
>>> Content-Type: text/plain; charset="ISO-8859-1"
>>>
>>>    I got one without the outer cover, which isn't quite as useful. I
>>>    removed all the junk to get down to the orginal non-double-ovened
>>> osc.
>>>    One thing I noticed - I wonder where these were actually  
>>> deployed?
>>> The
>>>    10811B itself has a fair amount of corrosion on it, lots of  
>>> pitting.
>>> It
>>>    still works fine, though.
>>>    Another thing, the 10811B in mine doesn't have a removable  
>>> endplate,
>>>    it's soldered. This makes it a lot more difficult to adjust or
>>> repair.
>>>    Still, I think it's a fine buy for the cost. Now all I have to  
>>> do is
>>>    figure out what I really want to do with it. :)
>>> Bill Ezell
>>> ----------
>>> They said 'Windows or better'
>>> so I used Linux
>>
>>
>> _______________________________________________
>> time-nuts mailing list -- time-nuts at febo.com
>> To unsubscribe, go to
>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>> and follow the instructions there.
>>
>>
>
>
>
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/ 
> time-nuts
> and follow the instructions there.