[Boatanchors] Coils and the winding thereof

[Carl]

THE issue is building coils that retain good RF characteristics for whatever 
term the builder desires. Since moisture absorbition over xxx amount of time 
becomes part of the equation it must be considered at all steps.

As far as your last paragraph I suggest that you do a bit of research before 
making such a declaration. Many, long before you, who have made those tests 
would take issue.

Carl
KM1H

----- Original Message ----- 
From: <match at ece.utah.edu>
To: <boatanchors at mailman.qth.net>
Sent: Thursday, July 02, 2009 2:19 PM
Subject: Re: [Boatanchors] Coils and the winding thereof


> On 2 Jul 2009 at 12:12, Carl wrote:
>
>> Any heat signifies loss which may affect performance by reducing the Q.
>>
>> Look for a material that stays at room temperature.
>>
>> However the microwave doesnt test for long term moisture absorbtion in a 
>> one
>> shot try.
>>
>> Carl
>> KM1H
>
> True, but that's a related issue and not "the" issue. Long-term moisture
> absorption is dependent upon how you make the form and what materials
> you make it out of.
>
> For example, I "think" shelac will absorb moisture, but I don't "think" 
> spar
> varnish does (anyone know for sure?). Therefore, if the strips of 
> newspaper
> are saturated with varnish, I don't think it will be absorbing moisture, 
> long
> term or otherwise.
>
> Either way, I think we're truly splitting hairs here. I would really be 
> surprised if
> coil forms made this way were lossy enough to notice.
>
> Marvin
> KA7TPH
>
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