Can you get the required number of turns (on the same core) with that wire?
Wire size is usually not important other than the physical requirement
that the turns fit onto a single layer winding (overlapping wires
increases the inter-turn capacitance).
The most important factor for a toroid inductor is the number of turns
for any given core size and permeability.
BTW - it is much easier if you start the winding in the center of the
wire (that is 1 turn) - wind half the number of turns with one end of
the wire, flip it over and wind the remainder with the remaining wire end.
73,
Don W3FPR
KB9BVN wrote:
Don,
Just for info...could you use insulated 24g cross connect wire for
this roid, thus making it easier to wind with no skinned spots on the
insulation?
----- Original Message ----- From: "Don Wilhelm" <[EMAIL PROTECTED]>
To: "Sam M" <[EMAIL PROTECTED]>
Cc: <elecraft@mailman.qth.net>
Sent: Wednesday, December 10, 2008 7:53 PM
Subject: Re: [Elecraft] K102 AUX I/O Module toroid question
The "23" in the core designation is the outside diameter, so yes, you
have the correct core.
The Ferrite cores have no color markings, they are a dull gray. It
is the powdered iron cores that are marked with colors.
As for tips on winding without scraping the wire enamel - *push* the
wire through the core center instead of trying to pull it through.
Yes, you will have to pull to snug up the last inch or so.
In addition, to make a neat toroid winding, on each turn, form the
wire around the *outside* of the core with a free finger or thumb
before pulling it tight.
The wire lengths given in the Elecraft manuals are usually generous,
which assures adequate lead length no matter how sloppy the toroid
winding may be.
The ferrite cores sometimes have sharp corners. You can round off
those corner edges carefully with a file or sandpaper if they are
exceptionally sharp.
73,
Don W3FPR
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