Re: More Coupling...

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Barton B. Anderson by way of Terry Fritz <twftesla-at-uswest-dot-net>" <tesla123-at-pacbell-dot-net>

Hi Jon

I still need to run this data, but just wanted to say THANK YOU! This will
be the first smaller
sized coil to look at for me. You provided excellent information about your
coil as well.

I'll post back once I run this (tonight or tomorrow - I've got a family
Christmas thing today).

Take care,
Bart

Tesla list wrote:

> Original poster: "Jon Rosenstiel by way of Terry Fritz
<twftesla-at-uswest-dot-net>" <jonr-at-pacbell-dot-net>
>
> Subject: Re: More Coupling...
>
> > Original poster: "Barton B. Anderson by way of Terry Fritz
> <twftesla-at-uswest-dot-net>" <tesla123-at-pacbell-dot-net>
> >
> > Hi Paul and Everyone,
> >
> > My reply here is to ask (plead) for more coiers to make coupling
> measurements.
> > All that is needed is a DMM capable of volt and amp readings (or meters
> capable
> > of this). Also needed is a primary that can be moved above and below the
> > secondary base line in steps (or the secondary to achieve the same
> result).
> > Measurement is easy (we can define that later).
>
> <snip>
>
> Hi,
>
> Just finished performing coupling measurements on my new small coil. I used
> Terrys method, (applying a heavy current, (11.5A with my heater),  to the
> primary and measuring the secondary voltage. (With a 10k resistor and a 1uF
> capacitor across the secondary).
>
> My coil is as follows:
> Secondary OD=4.2"
> Secondary winding length=24.5"
> Secondary wire size=28
> Secondary measured inductance=56mH
>
> Primary ID=7.2"
> Primary wire dia=0.1875"
> Wire spacing=0.25", (0.4375" center to center)
> Total turns=21
> Tap position=17.25
> Measured inductance=0.1131mH, (at 17.25 tap)
>
> Secondary elevation           K
> -0.375"                               0.110
> 0                                         0.103
> 0.25"                                  0.099
> 0.5"                                    0.095
> 0.75"                                  0.091
> 1.0"                                    0.087
> 1.25"                                  0.083
> 1.5"                                    0.079
> 1.75"                                  0.075
> 2.0"                                    0.072
> 2.25"                                  0.068
> 2.5"                                    0.065
> 2.75"                                  0.062
>
> Hope this is useful,
>
> Jon