[clug] GPS and temperature

[Jim Watson]

Cameron Patrick wrote:
> Mike Carden wrote:
>
>   
>> And if I can dust off some of my 1980s radio practice, a crystal oven
>> may be employed in high stability applications because it's not too
>> difficult to regulate the temperature of something that you've heated
>> to well above ambient but it's rather tricky to maintain an ambient of
>> say 20 degrees because you'd need to both heat and cool the crystal to
>> do so.
>>     
>
> At university physics departments (and presumably similar situations
> where accuracy is more important than dollars), they use liquid nitrogen
> or helium to maintain a sensible ambient temperature for oscillators.
>
>   
I believe its cool to reduce noise ;)


> The availability of such liquids also provides first and second year
> students with much entertainment :-)
>
> Cameron
>
>