[Test-Equipment] Make your own coil dope

[Carl]

Longevity for sure. I picked up several bottles of Millen Coil Dope maybe 25 
years ago and it is pre Zip Code. Its still good, even the one that I opened 
back then.  A little goes a long way.

Carl
KM1H


----- Original Message ----- 
From: <WA5CAB at cs.com>
To: <test-equipment at mailman.qth.net>
Sent: Friday, May 29, 2009 4:16 PM
Subject: Re: [Test-Equipment] Make your own coil dope


> In addition, (a) at least part of the time, the former you are glueing the
> wire to is also polystyrene so no question of how well it will bond, and 
> (b)
> it's much less trouble than mixing epoxy.  Open container, apply, close
> container for the next time.
>
> In a message dated 5/29/2009 2:11:31 PM Central Daylight Time,
> mikea at mikea.ath.cx writes:
>> On Fri, May 29, 2009 at 11:19:52AM -0700, davec wrote:
>> >Why not just use epoxy or such?
>> >
>> >Just curious what is special about the "coil dope".
>>
>> "Traditionnnnnnnnnnnnnnnnn!
>>
>>          Traditionnnnnnnnnnnnnnnnnnn!"
>>
>> Also, polystyrene coil dope has very low RF absorption, way up into the
>> near-daylight region of the spectrum. With store-bought epoxy, you don't
>> necessarily know how it will behave at, say, 6m or 23 cm or wherever you
>> choose to generate or receive your signal. With coil dope, you do,
>> because as soon as all the solvent evaporates, you've got polystyrene,
>> which is very much a known (and well-behaved) quantity.
>
> Robert & Susan Downs - Houston
> wa5cab dot com (Web Store)
> MVPA 9480
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