Hi Bob, it also depends on what you allow to leak into the vacuum. Hydrogen
is a pretty effective remover of heat :-))
Alan
G3NYK
----- Original Message -----
From: "Bob kb8tq" <kb...@n1k.org>
To: "Discussion of precise time and frequency measurement"
<time-nuts@febo.com>
Sent: Thursday, June 08, 2017 9:19 PM
Subject: Re: [time-nuts] backfill (was: Poor man's oven)
Hi
If you look at the thermal conductivity vs very low pressures, the
conductivity
comes up pretty quickly from a hard vacuum. There is essentially no impact
on Q.
Bob
On Jun 8, 2017, at 4:03 PM, Attila Kinali <att...@kinali.ch> wrote:
On Thu, 8 Jun 2017 06:55:07 -0400
Bob kb8tq <kb...@n1k.org> wrote:
The simple answer is that the backfill is done because it does matter in
a lot of
cases.
This raises the question, why there is backfill (just for thermal
conductivity?)
and how much it affects the Q of the crystal.
Attila Kinali
--
You know, the very powerful and the very stupid have one thing in common.
They don't alters their views to fit the facts, they alter the facts to
fit the views, which can be uncomfortable if you happen to be one of the
facts that needs altering. -- The Doctor
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