On Sat, 11 Feb 2006 08:16:41 -0800, dansawyeror
wrote:

All,

Reg's counterpoise program predicts the effective ground of a centerloaded
vertical on 75 meters can be improved by a tuned relatively short counterpoise
system. This is dependent on a large, high Q, low loss tuning coil.

After some playing with the numbers a starting point for the design of such a
coil is 200 mm diameter, 200 mm long, with 4 gage wire, and a pitch of about .7.
This is obviously quite large.

My questions a

1. Where is a good tutorial for large coils?

http://www.seed-solutions.com/gregor...on/HiQCoil.htm

Especially his reference No. 5.

Not specifically about inductor design, but might be of interest, are
some modeling experiments I did at:

www.k6mhe.com/n7ws

Nos. 1, 2 and 3.

Also see No. 14 if you think silver plating will help. (It won't).


2. Are there coil forms for such coils?

3. What would the impact of a square or octagon be versus round?

4. How critical is spacing toward a high Q?

Thanks,

Dan - kb0qil