[Elecraft] K3S new synthesizer query

[brian]

Please correct me if I am wrong.

I believe the heart of the new synthesizer is a SI-570.

Great phase noise but the output frequency is quite sensitive to 
temperature changes.

It has been observed that the corrections to bring the synthesizer in 
step with the master oscillator happen over longer and longer periods as 
the K3 warms up.  It never seems to reach a point of stability even 
after 24 hours of warmup.

Is there some kind of thermal material that one can put around the 
SI-570 to lengthen these periods and/or reduce it's drift?

73 de Brian/K3KO