[Elecraft] K102 AUX I/O Module toroid question

[KB9BVN]

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" <w3fpr at embarqmail.com>
To: "Sam M" <ka5oai at gmail.com>
Cc: <elecraft at 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
>
> Sam M wrote:
>> On my K102 AUX I/O Module,
>> I'm at the step that says:
>> "wind 12 turns of #26 red enamel wire (7", 18 cm) on the FT23-43 toroid 
>> core (L5)"
>>
>> 1st question) is the 3/16 diameter dark gray ring really the toroid?
>> I've always seen toroids with a color band on them, this one has none.
>>
>> also I was at about turn #6 when I skinned the wire while snugging it on 
>> the core
>> so I will have to start again with another piece of wire,
>> it seems I had only used about 2.5 inches of wire by turn 6's 
>> completion....
>>
>> so again I'm now wondering if what I thought was the toroid,
>> is not really the correct item
>> no, I don't see any other round thingies in there,
>> and yes I counted it as the toroid when I did the parts inventory.
>>
>> also any tips on how to not skin the wire while winding?
>>
>> I have wound many toroids b4,
>> but they all had a glazed looking surface
>> and didn't have the rather sharp edges that this core seems to have.
>>
>> it's way to small to try to sand the edges  <-- my first thought
>>
>> I'll stop babbling now and wait for ya'lls replies.
>>
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