Hi Steve,
I thought I would post a picture of my rig taking up the bench if your
curious.
https://photos.app.goo.gl/2JucJp5k0DIsiSfl2
I have not done too much this weekend on it like I thought, been thinking
on it alot, and have also gotten distracted by some other fun stuff at
times. I am also considering some bigger changes also. Need to think a bit
on this.
Anyway the big roller inductor on the left is a temporary tuning aid that I
am using. My Dad found this at a past Hamfest that we were at, oh maybe 2
years ago. Only just recently started using it. It has up to about 100uH.
Way more than enough. Pretty handy for testing tuning changes. Easier to
see "where" you are at. Easy to change this quickly while running of course
to verify.
Currently at about 5 turns. The goal is not to use any turns at all. Can
also see if you over cap some, because you will try to keep turning it down
hitting the end stop. Even though it gets you fine tuned in to current
components for max spark length, it is wasted energy there. Have the 29"
here. That is one of the things why I said I think there is still some
more. It does have an advantage of not changing, as John says of the
primary coupling turns to the secondary and affecting its feedback winding
coupling. Can have too many things interact. I usually like also to stay to
fixed primary/feedback also when I figure out one when building it. But the
roller will be temporary.
Even though I have alot of micas, can not get it quite right yet, gets
messy with several parallel, at times parallel and series, and just series.
Type E, F3, G2, G3, G4. Run out of room to mount them, even though I
started with a big mounting board. Too many poor temporary cap connections
also. Had the caps on a stool in front of coil, not much bench space left.
So I put in the closest single cap I have back in for now, a F3. Can never
have enough cap values, especially in a convenient size and voltage. Don't
really want to use several G3 or G4 micas on this coil, definitely
overkill, no room to mount nicely.
So debating the several ways of correcting this currently, so I can keep a
"nice friendly" value and size. Or I need more micas to add to the big
collection. Even, I am now having some space issues.
So I thought I would give some details of were I am at currently. Hope it
makes some sense.
Chris
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