LF,

I have been wondering about putting the device in a temperature-controlled 
enclosure and wonder if there's anything to be gained.  What is the 
frequency-determining element? If it is a quartz crystal or similar, what is 
the temperature at which the frequency dependence is a minimum?

Does this temperature fall within the permitted range of operation for this 
device?

Alternatively, could one realistically impose GPS discipline on a unit using 
this device (such as a QRP2000)?

John F5VLF