[Antennas] Next dumb question

[fred forbush]

Concerning the cap. hat the way I understand it is that the electrostatic
field surrounding the hat interacts with the electromagnetic field of the
loanding coil beneath it. I've found that using a cap. hat reduces the
amount of coil needed when tuning to a frequency.
73, Fred
k6kub


On Fri, Nov 23, 2012 at 11:08 AM, Michael Josefsson <mj at isy.liu.se> wrote:

>
> On 23 Nov 2012, at 18:39, Jim Miller wrote:
>
> > Is a capacity hat electrically connected (metal to metal) to the antenna
> > itself or is it just sitting there insulated but "capacitively coupled"?
> >
>
> It is electrically connected.
>
> > The coil I bought was supposed to be for 15 to 80 meters.  Well.. It only
> > tunes down (no coil) to about 4.1 and SWR is too high to use even at
> 3.963
> > MHz (and it won't go into the 15 meter band either, 20 is tops).  OK,
> > shorter whip for 15.
> >
> > But, for 80 meters, thinking about stationary operation and adding a
> > temporary top hat to bring me into the top end of the band.
> >
> > Better yet, also thinking about adding a few turns of extra coil at the
> base
> > to bring the whole thing down a bit.  How much would it take me to move
> from
> > 4.1 down to 3.9 or so using existing coil for adjustment and my 102 in
> whip?
> > Say #12 THHN close wound on a 2 inch form (6,8,?)
> >
>
> Everything depends on everything else... Trial and horror is your path :/
>
> Cheers anyway:)
>
> /Micke
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