[time-nuts] HP10811 dual oven

Alexander Pummer alexpcs at ieee.org
Mon Aug 3 20:13:36 EDT 2015

Hi Dan,
I would be interested on that document too
Thank you in advance

On 8/3/2015 12:40 PM, Dan Kemppainen wrote:
> Hi,
> If you search the internet, you should come across a design by Warren 
> S. It's basically the same type of oven controller that is used in the 
> internal oven for that oscillator.
> I did a surface mount version of his design a while back. I've been 
> running it for quite a while now. IMO it is helping to reduce the 
> thermal drift of the oscillator.
> Bob has pointed out in the past that the outer oven was not intended 
> to be active all of the time. This is probably true. That said it 
> seems to help in my setup.
> If you are unable to find the documentation, please let me know. I can 
> try to dig it up when I get home.
> Dan
> On 8/3/2015 12:00 PM, time-nuts-request at febo.com wrote:
>> Hi
>> The “external” heater on the Z3801 OCXO is only needed if you are 
>> regularly running below -20C in your environment. Other than
>> the alarm signal, there is no harm in letting it simply shut off 
>> forever.
>> Bob
>>> >On Aug 2, 2015, at 8:56 AM,timeok at timeok.it  wrote:
>>> >
>>> >
>>> >Hi,
>>> >I have seen, but I do not remember where, someone have rebuilt the 
>>> external oven controller to complete a stand alone OCXO removed from 
>>> an HPZ3801A.
>>> >Can you hep me to find the document?
>>> >
>>> >Luciano
>>> >timeok
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