Re: Primary tuning

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Dr. Resonance" <resonance@xxxxxxxxxx>



On a 12.75 inch form you will probably end up elevating to arund 4 to 4.5
inches for optimum.  On an 18 inch form it requires 6.75 inches of
elevation --- that's first sec turn above the horizontal plane of the
primary.

Use a scrap wire primary to explore your tuning range before committing to
copper tubing.

Dr. Resonance


>
> I posted this letter a few days ago but didn't get any response. The
subject
> heading "primary tuning" may have been overshadowed by the subject head-
> ing of another letter under the subject heading of "primary/secondary
tuning"
> which has already received several responses. Anyway, I'm posting it again
> to see if I get any better luck at responses this time :^))
>
> ----- Original Message -----
>
> Hi all,
>
> I need to get some input from from what you guys
> on the tap point of your primary coils vs. the size and #
> of turns of your secondary coils and the physical size of your
> toroids. I ran the specs of mine through Bart Anderson's Java
> TC program and after it "crunched the numbers" it stated that
> my primary should tune in at only a little over 4 primary turns.
> That's assuming my 12x56 toroid for the top hat and .2 uFd for
> the primary tank capacitance. However, I have to tap up to
> about 10 primary turns before I start to get any output off of
> my massive toroid, even w/ a breakout point. I have about 1260 turns
> of #19 wire on 12.75" x 48.5"  of a gray PVC duct pipe for the secondary
> coil and have a spiral of 12 turns of 5/8" OD copper tubing
> for the primary w/ ~ 1/2" turn/turn spacing and the innermost
> turn at about 15" in dimeter and the outermost (12th) turn at
> about 40" in diameter. I'm starting to think that I may have
> to either add to my primary coil or go to an even higher pri-
> mary capacitance. Maybe I didn't enter my data properly
> into Java, but I think I did. Maybe some of you guys that are
> more proficient at computer programs than myself can run the
> above info and see what you come up with for the proper pri-
> mary tuning point of my coil?? O, yeah, the bottom secondary turn
> sits at 2 1/2" above the plain of the top of the primary coil.
>
> Thanks,
> David
>
>
>