[Prev][Next][Index][Thread]
Re: Resonator Measurements For Robert Jones (in particular).
Earlier today I wrote:
On 16 May 00, at 17:00, Tesla List wrote:
> Original Poster: "Malcolm Watts" <malcolm.watts-at-wnp.ac.nz>
>
> Sent to the list for the benefit of all.
>
> I measured three resonators last night in less than ideal
> circumstances. I am confident that the measurements are close
<snip>
I forgot to include the capacitance calculations sorry. Just for
interest's sake, I also calculated the surface area of the windings. I
think there should be some semblance of correspondence. I also
reckon that if Medhurst is invariant wrt close/spaced winding,
C(intrinsic) should be as well if it is to give consistent answers
although none of these resonators is space wound.
> (1) Hs = 21.75", Ds = 4.75", N approx 870t, L(Wheeler) = 17.87mH
>
> 1/4 wave = 394.5kHz ( ? - sorry )
> 1/2 wave = 825kHz (800kHz)
C (from vp equation for 1/4 wave) = 22.5pF
A = 325 in^2
> (2) Hs = 22.75", Ds = 5.95", N approx 910t, L(Wheeler) = 29.3mH
>
> 1/4 wave = 276.5kHz (269.0kHz)
> 1/2 wave = 591.6kHz (575.7kHz)
C (calc) = 27.9pF
A = 425 in^2
> (3) Hs = 16.2", Ds = 9.05", N approx 650t, L(Wheeler) = 42.25mH
>
> 1/4 wave = 219.0kHz (212.7kHz)
> 1/2 wave = 476.0kHz (458.6kHz)
C (calc) = 30.8pF
A = 461 in^2
There does appear to be a first order scaling involved which seems
rather satisfying.
Malcolm