Original poster: kidd6488@xxxxxxx
Ok, this is one aspet of my coil I haven't really messed with in the
past. Quick specs: 12/60 NST 1x9 geek cap MMC (forget the specs off
hand) multiple static spark gap. ~11 turns flat spiral primary of
.25" Cu tubing. about 30x6 secondary #20AWG (~900 turns?)
Right now my coil can only be raised above the primary. Would it be
worth my time to try and adjust this up? It is doable but would
take considerable work to do so. Also, would it be worth it to try
to lower it? This would take a LOT of work, requiring some cutting
of my nice little table and changing / jury rigging some of my neat
wiring work.
Just up for suggestions... Also, do you have to be subscribed to the
list to post to it? I sent one in from my work email, but then
realized it might not go thru.....
thanks,
Jonathon
-----Original Message-----
From: Tesla list <tesla@xxxxxxxxxx>
To: tesla@xxxxxxxxxx
Sent: Mon, 08 Aug 2005 08:01:27 -0600
Subject: Re: re: 2nd light of the "Green Monster" - sec vs. pri height
Original poster: <mailto:DRIEBEN%40midsouth.rr.com>DRIEBEN@xxxxxxxxxxxxxxx
Jonathon,
This affects the primary/secondary inductive coupling.
With smaller coils, optimum coupling (the point at where
maximum output sparks are achieved WITHOUT racing sparks
running up and down the surface of the secondary coil)is
generally achieved with the bttom of the secondary coil
level with or slightly below the plane of the primary
coil, assuming that the primary coil is of the flat Ar-
chemedian spiral design and assuming that the secondary
coil is in the typical aspect ratio range (4:1 to 5:1).
However, with the design of large, high powered coils of-
ten dictates lower optimum coupling than with smaller coils.
Large secondary coils often run at the lower end of or be-&n
bsp;
low the typical aspect ratio and the output spark of a
large well designed and tuned system can reach up to 3
times the length of the secondary coil. Dr. Resonance has
suggested that the bottom of the secondary can be as high
as 7" to 9" above the primary plane for very large coils.
Having your secondary's verticle placement permanently
adjustable is a great feature to have in your coil. On the
down side, that feature is quite difficult to build into
a coil system and I my mechanical aptitude wasn't up to
par to allow me to build that into my coil ;^(
David Rieben
David Rieben
----- Original Message -----
From: Tesla list <<mailto:tesla%40pupman.com>tesla@xxxxxxxxxx>
Date: Sunday, August 7, 2005 8:37 pm
Subject: Re: 2nd light of the "Green Monster" - sec vs. pri height
> Original poster: <mailto:Kidd6488%40aol.com>Kidd6488@xxxxxxx
>
> Perhaps I've been away from coiling from too long, but aren't most
> coils either level, or the secondary is BELOW the primary? Mine
> is
> built to be adjustable but only from 0 to several inches above the
> primary.... What exactly does this change when changing the height?
>
> Thanks!
>
> Jonathon
>
> In a message dated 8/7/2005 12:05:52 A.M. Eastern Standard Time,
> <mailto:tesla%40pupman.com>tesla@xxxxxxxxxx writes:
> The bottom winding of
> the secondary coil sits at 5/8" above the plane
> of the primary coil.
>
>
>
>
>