How big is the land area?
Stan, ZF9CW
> On Jan 8, 2020, at 4:30 PM, Robert Fanfant <rfanfant@hotmail.com> wrote:
>
>
> Am looking to activate a location with very limited space surrounded by
> ocean. Think of a small rock surrounded by saltwater/ocean. The vertical
> will be a tall 60’+ fiberglass pole and made to resonate on 160m. I would
> like a way to reduce the required space of the 160m antenna radial field due
> to the limited physical space available. The vertical will be located at the
> waters edge, or even possibly over the oceans surface. At the feed point,
> will be a choke designed for 160m. We should also assume maximum power of
> 1.5KW being fed into the vertical and the activation will be for a 2 week
> duration of time.
>
> One idea that came up is to use a floating piece of conductive material as
> the verticals counterpoise. Specifically, a thin conductive plate designed
> to float on the oceans surface. From the antenna’s feed point, will be a
> short length of ground wire say about 6’ long, to this conductive plate.
>
> Question(s):
>
> 1. Is it possible to just use the ocean as the ground plane / counterpoise
> ? That is, can this idea work?
> 2. If so,
> * How do I determine the required square footage/size of the plate?
> * What material should be used as the conductive plate? (Nickel,
> copper, aluminum, etc..? )The thought here is to make this plate as light as
> possible, yet effective. It will need to last the duration of the activation
> (~2 weeks) in/on saltwater, it needs to handle 1.5KW at the feed point, and
> likely exposed to air and saltwater as it floats on the ocean surface.
>
> -rob N7QT
>
>
>
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