Adj. Pri. Cap

From:  Bert Hickman [SMTP:bert.hickman-at-aquila-dot-com]
Sent:  Thursday, January 22, 1998 8:20 AM
To:  Tesla List
Subject:  Re: Adj. Pri. Cap

Tesla List wrote:
> ----------
> From:  Rene Caldera [SMTP:Rene-at-compuserve-dot-com]
> Sent:  Wednesday, January 21, 1998 12:15 AM
> To:  Tesla
> Subject:  Adj. Pri. Cap
> I'm thinking of building an adjustable primary cap(plate type) so that I
> can use it to tune the main circuit instead of the primary coil.
> Can anyone tell me why this wouldn't be a good idea(besides the extra work
> involved).
> Thanks
> Rene Caldera


Are you thinking about bringing out external taps or are you looking to
make it infinately adjustable, to adjust it while in operation. A number
of coilers have used either method with success. An air-insulated
variable transmitting capacitor (1/4" or so spacing between plates)
which is immersed in transformer oil will work quite well when connected
across your main cap(s) to provide precision tuning. However, be very
careful that you are not going to make accidental contact with either
lead of the cap - I've seen primary RF jump about 2.5". Use a long shaft
made from a good insulating material.

Safe cappin' to you!

-- Bert --