[Elecraft] K102 AUX I/O Module toroid question

[Sam M]

K102 is installed and working FB,
I tried again with the small red wire, but this time remembered to not pull the 
wire through, also did the start in the middle style of winding. I know I nicked 
one spot but it was in the clear and appeared not to be in contact with any 
other turns so I let it go. Since it powers up ok and HRD controls the K2 as 
needed, I guess I got away with it.

Thanks to all for the suggestions. Once again the Elecraft community supplied 
the needed tips for the clueless, hi hi.

-- 
GB & 73
KA5OAI
Sam Morgan
http://linuxbasics.org
Linux, the lifetime learning experience.


replies below:
> 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.
> 
snip
>> 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?
snip
>>> 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.
>>>