[time-nuts] Environmental sensor recommendations

[Mark Sims]

I replaced the OCXO on one of my Thunderbolts with an Oscilloquartz 8663 and the temperature sensitivity went down by about 2/3, so I always assumed the main contributor was the OCXO.  I didn't try mod-ing any other Tbolts.  

I also tried temperature stabilizing the power supply and it seemed to also have an influence.

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>  I respectfully disagree. The OCXO is not the temperature problem with the Tbolt.