Re: [TCML] Coax Capacitor

[Bob Wroblewski <bwroblewski@xxxxxxxxx>]

Not so silly a question at all!
I demoed a small coax capacitor TC at Ed Wingate's Teslathon in 2006. See the following link.
http://www.tb3.com/tesla/ratcb2006/index.html Terry Blake posted photos of it on his web site about 14 rows down in the thumbnails. Shown with a 4inch incandescent light as a plasma globe and a box of Suddenly Salad (marked up with a label).
 
I named it Suddenly Tesla Coil because it went together in as weekend from past coiling projects and a scrapped 72 foot piece of RG-8 coax taken out of service from my ham shack. It had a 7.5KV/30ma NST. Single static gap connected directly to the coax coiled up as a flat primary. The secondary was a small 1.25 inch diameter by 12 inch long PVC tube wound with #28 magnet wire.
 
Performance wasn't great (less than 1 inch air discharge) because of the feeble capacitance value but it was neat by the fact that the coax coil served as both the tunable primary inductor and tank capacitor.
"We don't need no stinkin' capacitor!"

Bob Wroblewski
Dracut, MA

----- Original Message ----
From: Ben Sneath <bsneath@xxxxxxxxxxxxxxxx>
To: tesla@xxxxxxxxxx
Sent: Friday, November 23, 2007 6:01:57 AM
Subject: [TCML] Coax Capacitor

a rather silly question i suppose...
has anyone tryed coax as a tank capacitor, i think its 10 pF
per foot... it'd be good up untill about 15kv would it not?
as for inductance, its in the 10's of uH range. you could
buy a roll cut it into 1' lengths, solder to a pair of end
plates...
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