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From: =?iso-8859-1?Q?Niels_Rudberg_J=F8rgensen?= <niels.rudberg@post.tele.dk>
To: rsgb_lf_group@blacksheep.org
References: <Pine.LNX.3.95.1050113192427.286A-100000@noname.nodomain.nowhere> <000901c4feac$b818ce80$6401a8c0@eagles>
Date: Thu, 20 Jan 2005 12:17:38 +0100
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Subject: LF: Re: Coil Winding,  de  VY1JA
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----- Original Message ----- 
From: "J. Allen" <vy1ja@northwestel.net>
To: <rsgb_lf_group@blacksheep.org>
Sent: Thursday, January 20, 2005 5:58 AM
Subject: LF: Coil Winding, de VY1JA


> LF,
>
> I have just spent three hours trying to find any practical information on
> the Web on how to wind a honeycomb coil at home.  I can see pictures of
the
> finshed coils but without some step by step photos of how it was done, the
> pix of the finished product does no good here.
>
> There is no rush on this, because in the absence of information, I can use
> existing materials and make a less efficient single layer solenoid with
one
> diameter conductor spacing, which will get me on the air for now.
>
> Does anyone know where the honeycomb coil winding data can be found?
>
> J.
>
>
~Hello!
Why honeycomb coil, basket weave etc?
In my humble opinion, the best way of making a high-Q coil or variometer
is to use the "pyramid" or "bank" winding method.
You may see the method mentioned in Terman, 1943-edition, pg. 84.
This method was used for decades by the manufacturers of e.g. marine radio
transmitters, primarily because it combines achievable high Q and modest
physical dimensions.
You may find detailed information on my home page: www.oz8nj.dk
This homepage is in danish language, but if you look after "spoler"
(=coils),
you will find a description in english and a number of photos.
BTW, talking of the separation of coil turns, do not believe in the
"one-diameter
separation", -- this idea is probable ok for short wave, but not in our
case.
I use RF Litz wire for my coils, I have, however seen old coils wound with
solid cotton-covered copper wire. It seems to me, that one should not
over-estimate the proximity effect.
73 =
Niels, OZ8NJ+