[Milsurplus] [Boatanchors] Coils and the winding thereof

[B. Smith]

    Having just finished building a homebrew 14 tube receiver (the 
HBR-14 )and winding coils for several bands including 160 meters I've found 
that  coating the coils completely  with paint, dope, different kinds of 
glue etc. will lower the Q by 10 to 15 points (measured with a Heath Q- 
meter). On a typical coil that has a overall Q of 140 to 150-----lowering 
the  Q value  by  10 to 15 points will just not effect the overall receiver 
performance enough to worry about.  However, instead of completely coating 
the coils   I just applied three vertical strips, approximately  1/8 inch 
wide spaced evenly around the coils using fingernail polish to hold the 
windings in place.


We used to say " Don't sweat the small stuff" and get on with the mission.


73
breck k4che




Message ----- 
From: "J. Forster" <jfor at quik.com>
To: "Michael Tauson" <wh7hg.hi at gmail.com>
Cc: "boatanchors" <boatanchors at mailman.qth.net>; "arc5" 
<arc5 at mailman.qth.net>; "milsurplus" <milsurplus at mailman.qth.net>
Sent: Friday, July 03, 2009 11:11 PM
Subject: Re: [Milsurplus] [Boatanchors] Coils and the winding thereof


Available at most Home Depots by the quart. Just use it outside.

-John

===========

> On Fri, Jul 3, 2009 at 4:04 PM, Michael Tauson<wh7hg.hi at gmail.com> wrote:
>> is liquid teflon now. Â The current version of Q Dope is liquid
>> polystyrene but I'm not sure that existed then so could well have been
>> liquid acetate which definitely would have been available.
>
> Update: Q Dope's MSDS states it contains MEK which is unpleasantly
> unpleasant stuff.
>
> Best regards,
>
> Michael, WH7HG
> --
> http://www.nationalmssociety.org/chapters/NTH/index.aspx
> http://wh7hg.blogspot.com/
> http://kludges-other-blog.blogspot.com
> Hiki Nô!
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