Re: Question about capacitors for coil

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Original poster: Vardan <vardan01@xxxxxxxxxxxxxxxxxxxxxxx>

Hi John,

I have had many 4 x 20 coils and I loved them all!!  Stay with the 4 
inch form, wind it to 20 inches with say 1/2 inch extra tube on the 
ends so 21 inches total.  Any good "plastic" coil form will work 
fine.  Rub it with alcohol to remove dirt first, but it is tall 
enough that it does not matter much.  Keep lot of pieces of masking 
tape handy during winding to lock the winds down as you go.  Wind the 
wire sort of "tight" (but no where near breaking the wire), since 
temperature and humidity tend to loosen the turns over time.

#28 wire like you have winds roughly 73 turns per inch so that is 
1460 turns which is perfectly fine.  More importantly the inductance 
is 39mH which is "just right"!

The 4 inch secondary will couple well and the 20 inch height will 
avoid primary to secondary arcing.

It will tune into the 160kHz range which is "just right" too...

Such a coil will work with a very wide variety of "everything else" 
so you can't go wrong.

Cheers,

        Terry


At 04:55 PM 10/2/2006, you wrote:
> Sorry for asking so many questions.... I am limited on resources and 
> want to /try/ and have a good design as my first coil.
>
> So 4" diameter and 28g wire.... 1000 turns gives me (about) 13.7 in 
> height which is really squat. This should give me decent results? 
> Because 14" is quite far rom what Dr. Resonance said about 24-26" 
> with 30g wire....which would obviously be way more turns.....