Re: magnifier driver

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

Original poster: "colin.heath4 by way of Terry Fritz <teslalist-at-qwest-dot-net>" <colin.heath4-at-ntlworld-dot-com>

hi guys,
             thanks for the replys, what are the modes you talk of with
magnifiers as im going for a tight coupled driver with good quenching gap
with a 5-1ratio of resonator to driver inductance.is this the mode?
also is the heavy insulation to stop sec to pri arcs or arc over of the
driver secondary.
if its arc over of secondary then i think the shrink wrap will pull into the
gaps of the wire tighter giving less room for an arc then coat the rest with
poly perhaps
many thanks
colin heath
----- Original Message -----
From: Tesla list <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Wednesday, May 28, 2003 9:55 PM
Subject: Re: magnifier driver


 > Original poster: "Christoph Bohr by way of Terry Fritz
<teslalist-at-qwest-dot-net>" <cb-at-luebke-lands.de>
 >
 > Hello Collin!
 >
 >  > hi all,
 >  >          im currently building my maggie and have a few questions.
 >  > how much gap should i leave between primary and secondary due to tight
 >  > coupling?
 >
 > I use about 1,5" spacing at the bottom of my 8" master oscillator but I
use
 > a inverted cone shaped primary ( 30 degrees )
 > I know that using two cylindrical coils is more common with magnifiers but
I
 > was able get all the coupling I needed with this setup sofar....
 > The well known magnifier of Bert Pool uses this setup with heavy shielding
 > so this might be the better way, although from my peronal experience ( not
 > too much ) I can not really see a nessesary need for this to achieve good
 > power throughput, but that might depend on the mode you run your maggy
 > in....
 >
 >  > i have a 21" primary so i was thinking the driver secondary could be
16"
 >  > heavily wrapped in poly or shrink wrap(saran wrap)
 >  > i thought 2.5" would be plenty clearance all round as the driver is
only
 > low
 >
 > I can't be sure about the influence of the frequency as the might be high
 > frequency feedbacks from the resonator. As Terry posted some days ago
 > wrapping with foil can be very efficient or submerging the whole pri -
sec -
 > setup under oil.... very messy but probably the most reliable way...
 > Another point is that wrapping a coil in foil is not allways as pretty as
 > desired. I believe for the first setup you should be able to get along
with
 > only very little insulation if you adjust your coupling carefully.
 >
 > Nevertheless, I wish good luck for your magnifier experience, if set up
 > right a maggy really can ( can! ) outperform a conventional coil. This
 > subjective experience of mine is more related to the very smooth operation
 > than to pure sparc output ( although I achived better sparcs, too )
 >
 > happy coiling!
 >
 > Christoph
 >
 >
 >