Russell McMahon wrote:
> All very impressive.
> I'm jealous :-).
>   

You can't be. Russell. You can easily do better. I have read your stuff
> One  extremely minor note.
>
>   
>> and the crystal for it is maintained at a steady temperature by a 
>> temperature-controlled heater.
>>     
>
> Your crystal oven seems to be overkill.
> A wristwatch crystal "ovened" by operating on a person's wrist can 
> easily operate at under a second a day accuracy.
> A system using that time source would maintain adequate tracking for 
> months.
>
> One minute per day is about 700 ppm drift and one second per day is 
> about 10 ppm.
>
> But I imagine that your temperature controlled heater is a minimal 
> addition to the expense.
>   

Its not expensive, because in some locales the outside temperature is 
-20C. I need it, really.
>
>
>         Russell
>
>   

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