Rob,
I considered this for my MM SSB. It doesn't work. Several published
tests prove that. Ok as an AC/DC ground.
Grant
On 1/9/2020 01:18, Herbert Schoenbohm wrote:
A very effective device called *Dynaplate* works very well as a saltwater
grounding system for boats or limited areas to run full-sized radials. You
can get one for $100 from the link below.
https://www.jamestowndistributors.com/userportal/show_product.do?pid=13331
Herb, KV4FZ
On Wed, Jan 8, 2020 at 6:30 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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