On Dec 16, 2005, at 6:58 AM, Peter Chadwick wrote:
> Lets consider my original proposal, a parallel tuned circuit.
>
> Working Q is given by (let's assume an infinite component Q for the
> moment) XL/RL. That value of XL can therefore be made anything we
> want.
>
> The simplest approach is now to tune the inductor to resonance with a
> shunt capacitor, and we can link couple in. Vary the link (i.e.the
> effective leakage inductance)? and voila!
>
> The link could be substituted by a suitable large value of inductance
> between the input and the top of the tuned circuit. The value of the
> inductance depends on the impedance of the step up ratio that we want:
> we'll have to readjust the tuning capacitor, but we will still have
> the Q fixed by the ratio of the inductance to load impedance. Or we
> can even tap the tx at the bottom of the tuned circuit, and adjust the
> tap point for a match  and then we have a tuned auto transformer.
The potential fly in the pie is that, especially for a lengthy
inductor, not all of the magnetic flux lines in the primary couples to
all of the flux in the secondary. Thus, a tapped L arrangement is not
necessarily a simple autotransformer
> The higher the amount of capacitance, the higher the Q.
>
> Peter G3RZP
>
> ?
Richard L. Measures, AG6K, 805.386.3734. www.somis.org
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