coupling

• To: tesla-at-pupman-dot-com
• Subject: coupling
• From: bob golding <yubba-at-clara-dot-net> (by way of Terry Fritz <terryf-at-verinet-dot-com>)
• Date: Sun, 13 Sep 1998 18:55:16 -0600
• Approved: terryf-at-verinet-dot-com

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 in 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

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