[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: Primary tuning

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

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 > > >