[R-390] Xtal Question

[Flowertime01 at wmconnect.com]

Dennis,

Because we run the receivers with the ovens off, should we be using the 
speced at room temperature CR-36A/U type in the first Oscillator?  Instead of the 
calibrator/oven CR-27/U type l specs at 75 deg C.

I have gone and misplaced my TM !!!.
Does the oven in the 17MHZ and calibration crystal run all the time even with 
the ovens off?

How far off will the frequency be for these crystals if we run them at the 
wrong temperature?

Roger KC6TRU