the farther out you can get them the better it will usually work, adding
capacitive loading hats on the ends of the elements will also help and
increase the bandwidth.

wrote in message
...
Hello all. I am looking at building a half size rotatable 40M dipole.
It will be approxiamately 10 metres long end to end. It will have a
loading coil in each leg with about 5 metres of wire wound on a nylon
former. My question is, where would be the best spot to mount the
loading coils? Half way along each leg, ie- about 2.5 metres from the
feed point or should the coils be mounted closer to the feed point? I
realise that this antenna will be inferior to a full size dipole, but
a half size one will fit where I am located.
Any constructive ideas or experience with loading coils would be
appreciated.
Cheers
Max

On Oct 11, 9:54*pm, "Dave" wrote:
the farther out you can get them the better it will usually work, adding
capacitive loading hats on the ends of the elements will also help and
increase the bandwidth.

Hello Dave,
I was wondering about capacity hats. Don't know much about them or had
any experience with them. Will have a look on google.
Cheers
Max

wrote in message
...
On Oct 11, 9:54 pm, "Dave" wrote:
the farther out you can get them the better it will usually work, adding
capacitive loading hats on the ends of the elements will also help and
increase the bandwidth.

Hello Dave,
I was wondering about capacity hats. Don't know much about them or had
any experience with them. Will have a look on google.
Cheers
Max

the cushcraft 40-2cd and the xm-240 use them just after the loading coil.
They can also be mounted at the tip of the elements. They use two 18-24"
long aluminum rods in an X configuration. More rods, or adding a wire
around the tips adds more capacitance.

On Oct 11, 12:50*pm, "Dave" wrote:


the cushcraft 40-2cd and the xm-240 use them just after the loading coil.
They can also be mounted at the tip of the elements. *They use two *18-24"
long aluminum rods in an X configuration. *More rods, or adding a wire
around the tips adds more capacitance.

The tips is a better location for the hats. You get some degradation
if you
mount the hat just above the coil.
You can check W8JI's mobile antenna info for the why's..
BTW, you generally will use the same techniques for these as you
would a mobile whip..
A half size dipole is basically just two mobile whips end to end to
make a
dipole. All the techniques used to maximize mobile antenna performance
can be applied to half size, or smaller dipoles.