[time-nuts] backfill (was: Poor man's oven)

Alan Melia alan.melia at btinternet.com
Thu Jun 8 17:49:26 EDT 2017


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" <kb8tq at n1k.org>
To: "Discussion of precise time and frequency measurement" 
<time-nuts at 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 <attila at kinali.ch> wrote:
>>
>> On Thu, 8 Jun 2017 06:55:07 -0400
>> Bob kb8tq <kb8tq at 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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