Re: 8 kHz Tesla Coil

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>

Hi Gerry,

Sure, no problem, except the losses. Once again, Javatc says 6 awg is 
recommended. The resistance you identified is only the DC wire length 
for the wire size. I usually don't worry about being a couple wire 
sizes off (that is typical as Javatc is looking for 6 x Sd on 
closewound coils and we are all prone to using standard sizes like 
18, 24, 28, etc..), but it's off by 20 wire sizes? well, that gets my 
attention.  26 awg is 0.0159" diameter. Sd is .029". Hence, the RF 
losses are far too high and would make for a very inefficient coil 
for any purpose (except maybe a garage heater for those cold winter months).

Maybe if it was just pulsed for brief periods, it would be useful. 
Low frequency coils are high loss coils, unless their big - there's 
just no way around it (unless we can cheat RF losses with a different 
material?).

On a side note, I could turn those sD numbers into actual AC ohm 
values. Maybe I should do that in a nexgen Javatc. It might help 
these underlying losses to standout.

Take care,
Bart



Tesla list wrote:

> Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>
>
> Hi All,
>
> I ran a 24x80 coil thru JAVATC and came up with these numbers:
>
> Secondary 24x80 with 26awg and 4490 turns
> Freq = 8.2 KHz Resistance = 1150 ohms
> Wire = ~28200 feet and 22 lbs
> Toroid 24x80 and about 94pf.
> Gerry R.