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Re: tapped primary
> Subj: Re: tapped primary
> Date: 6/3/00 7:43:58 AM Pacific Daylight Time
> From: tesla-at-pupman-dot-com (Tesla List)
> To: tesla-at-pupman-dot-com
> Original Poster: "Finn Hammer" <f-hammer-at-post5.tele.dk>
> When you start to design your coil, there are unknown factors that need
> to be accounted for. So you build some slack into it.
> Relating to your specific question, this means that you build the
> primary coil with more turns than you really need, and then "tap" it at
> a point further in on the coil, than at it`s outher end. The connection
> to the coil that can be moved is then called the tapping point.
> When you set the coil up for the first run, it will at best be in
> marginal tuning, that means that the resonant frequency of the primary
> and the secondary cap/coil circuits are not quite equal. To bring the
> coil into tune, resonnance, you then move the tap point, untill the coil
> is in tune.
> When you have got it into tune, you will probably want to make
> alterations to the coil, in attempt to get longer sparks, and this can
> be done by making the topload (toroid) bigger, which will lower the
> resonant frequency of the secondary circuit. To make the primary circuit
> follow, you then need to add turns to the primary coil, you tap
> outwards. This will make longer sparks with the same power input.
> Or you might want to increase the tank capacitor to a point where this
> means that you actually have to decrease the amounts of turns on the
> primary coil, even with a bigger topload.
> As you will see, the tapping point, in conjunction with a primary coil
> that has a generous amount of turns, is the key to obtaining initial
> tuning, as well as allowing further experiments to be performed.
> Hope this helps,
> Cheers, Finn Hammer
Those with only a starting grasp of coiling thank you for an exceptionally
clear explanation of tuning a new coil!