"Vinnie S." wrote in message
...
On Mon, 9 Jan 2006 20:53:56 -0600, "DrDeath"

wrote:

I am trying to build a balun. I chose the one on this web site as I like
the
design
http://www.hamuniverse.com/balun.html
It states that, and I quote
"The number of turns is not critical because the inductance depends more
on
the length of the wire (coax) than on the number of turns, which will vary
depending on the diameter of the plastic pipe that is used."
But it does not give the formula. It just says 18 to 21 feet.
I plan to use 4 inch pvc and I want to cover as much of the upper 11
meters
as I can. Am I better off at 18 or 21 feet?


I built one like the one on the right. I used my Hustler 5BTV manual, and
it
said to use a 10 turn 6 inch form. That was a bitch to find a 6 in form.
SO I
found the website above, and used the left as a model. The 4" PVC does not
quite
give you 6 inches in form. But as the website states, if you butt to
couplers
together, that will give you a 6 inch form. The couplers are 5 inches at
the
outside edges. By the time the cable is wrapped around it, it's about 6
inches.
I figured that was as close as I could get. As the website mentioned, I
used the
4" PVC pipe as a joint to butt the couplers together, to make them hold
better.
So, I don't know if I used 18-21 feet, but I think I am pretty damn close.

Vinnie S.

I can get 6" pvc. Start with 21 and work my way down till we get the desired
effect.