Jumping in with both feet?
From: Julian Green [SMTP:julian-at-kbss.bt.co.uk]
Sent: Wednesday, January 28, 1998 8:24 AM
Subject: Re: Jumping in with both feet?
> The secondary is wound with about #22 wire around a
> cylinder of 1/2" wide varnished wooden strips spaced about 1/2" apart. It
> consists of two sections in series, each 2' long, about 3 inches between the
> two sections, for an overall winding length of 4'. It is 16" in diameter
> with about 13 turns per inch.
Moisture can be a problem with wood, if you get a spark that scorches the
wood then it will char the wood leaving a highly conductive path of carbon.
A devil of a job to get rid of as the carbon track can go very deep.
> Any opinions as to the capabilities of this rig? Would it be meaningful to
> temporarily short the spark gap and attempt to grid-dip the primary tank and
> see where it resonates?
Yes this is often done, but I've never done it. I prefer to run the coil on
very low power, with a very small spark gap. I test my coil with only 5volts
input to the neon transformer. I use a flourescent tube held near the output
terminal which glows brighter when the coil is in tune.
Does the secondary self-resonate with distributed
Yes, but you get better sparks if you have a big top load. The bigger the better
> To what spacing should I set the gap when I start testing?
As small as you can make it, and work up from there.