[time-nuts] Improving ocxo temp control

Bob kb8tq kb8tq at n1k.org
Sat May 19 10:09:07 EDT 2018


Hi

One key point about the need for “zero gradient”: 

Crystals and many other components are quite sensitive to thermal gradients. Very small 
fractions of a degree (as a gradient ) can have significant impact on the frequency of an 
oscillator. 

One of many “interesting things” about fiddling about OCXO’s. 

The equally frustrating thing about this is that unless you can tease kind paper authors
into posting things ( thanks Rick !!) the papers are behind pay walls. I pretty much despise
that practice. Referencing papers that send people off to spend money ….not so much.

Bob

> On May 19, 2018, at 12:03 AM, Richard (Rick) Karlquist <richard at karlquist.com> wrote:
> 
> In my experience, the oven temperature controller is rarely
> the determining factor for static oven performance.  This article
> explains what the real determining factors are:
> 
> http://www.karlquist.com/oven.pdf
> 
> An analog oven temperature controller will be limited in
> its dynamics by how much capacitance you are able to
> design with.  Digital controllers get around this as well
> as having the capability of double integration for much
> better transient response.
> 
> Rick
> 
> On 5/18/2018 11:03 AM, Gilles Clement wrote:
>> Hi,
>> I am trying to improve performance of an OCXO.
>> Could you point me at a good design of a high resolution oven temperature controler please ? Preferably analog.
>> Thx much,
>> Gilles.
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