[Elecraft] Toroid Winding Question

[Don Wilhelm]

Kevin,

I have not tried it, but I believe the ferrite material is harder than 
the 'wet and dry' paper.

All in all, I do not believe any prep work on the cores is worth the 
effort.  Just remember to *push* the wire through the center rather than 
trying to pull it through.  Using your finger to form the wire around 
the *outside* of the core as each turn is placed will result in a neater 
and tighter winding than all the pulling in the world.

Try it on 2 toroids - then wind your 3rd - after that you too can call 
yourself an expert.  Many folks seem to have some anxiety about toroids 
until they have wound some.  It is not necessarily the most pleasant 
task, but it is really easy - just do it.

If you have a long wire to deal with, start in the middle, wind half the 
turns and turn it over and wind with the other half.
As soon as you put a wire through the center of the core, start counting 
- that is one turn.  One full winding around the core is two turns.

73,
Don W3FPR

KBG Luxford wrote:
> With respect to toroid sharp edges, should one rub some "wet and dry" 
> abrasive paper around the edges before winding?
> 
> How about winding plumbers' pipe thread teflon tape around the core 
> before winding?
> 
> I am about to resume work on my K2!
> 
> Happy July 4
> 
> Kevin
> VK3DAP / ZL2DAP