----- Original Message -----
From: "J. Allen" <[email protected]>
To: <[email protected]>
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+
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