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Re: coupling
to: Bob
Coupling decreases as the sec. coil is elevated. Approx 1 1/2 inch usually
works best with a small coil and flat primary.
DR.RESONANCE-at-next-wave-dot-net
----------
> From: Tesla List <tesla-at-pupman-dot-com>
> To: tesla-at-pupman-dot-com
> Subject: coupling
> Date: Sunday, September 13, 1998 6:55 PM
>
> Original Poster: bob golding <yubba-at-clara-dot-net>
>
> Hi All,
>
> Have just been playing around with the coupling of my coil.
> 9 Kv 60mA neon,
> Conical 30 degree primary 9 turns 3/8" Cu,
> home made flat plate cap 15 nF,
> RQ gap 0.125" gap, vacuum quenced
> 41/2" secondary 21" winding length, About 980 turns 23 AWG,
> 19" x 4" toroid.
>
> I am getting 20" sparks to a grounded rod with the primary tapped at 8
1/2
> turns. I started with the base of the secondary windings about 2" above
the
> first turn of the primary. This gave 20" sparks. I then moved the
secondary
> down to be in line with the first turn of the primary. This does not seem
> to have made any differance to the spark length. is this because the coil
> is too far out of tune? I did notice that safety gap activity is less
with
> the secondary lower. Am I right in thinking that the coupling is at the
> mininim when the the secondary is line with the bottom turn of the
> primary, therefore there is no point in adjusting the coupling below this
> point?, and that coupling is increased as the secondary is raised. How
> much differance does the distance between the the primary and the
secondary
> make?. At the moment I have about 1" I would find it hard to tighten this
> up due to the design of my coil.
>
> many thanks
>
> bob golding lightning without rain
>
> bob yubba.clara-dot-net
>
>
>