Next message: Pascal Gademer: "lv-ab: Inverters... pure sine or modified?"
I agree with your flat wire comments although I don't think the difference
is significant.
No, you don't need capacitors with a mesh ground. Capacitors are to break a
DC circuit that could cause electrolysis to underwater metal fittings.
Since the mesh is not in the water, no capacitors are needed.
Regards,
Andina Marie Foster,
----- Original Message -----
From: "Pilgrim" <>
To: "Jerry Peters" <>; "live-aboard"
<>
Sent: Sunday, August 08, 2004 12:26 PM
Subject: Re: lv-ab: SSB Ground plane
> Jerry Peters wrote:
>
> > Hello group - This is my second post regarding SSB installation
> >
> > Three quick questions if I may. First, I understand that round wire is
> > invisible in the grounding system and flat sheet or screen copper is
> > required/preferable. If screen is used, what are the critical
> > characteristics - grid size, wire size, etc? I am concerned that the
screen
> > is just a bunch of small round wires. Second question is related. It is
> > recommended to use several isolation capacitors for establishing the
> > connection to the engine or other DC ground to avoid a DC ground loop
> > between the antenna system and the radio. Once again, aren't the lead
wires
> > to the capacitors round wire and won't they "disappear" electrically?
Third,
> > is it important to keep the ground plane below the water level?
> >
> > My current plan is to laminate the interior of the hulls (catamaran),
above
> > and below the water line, with copper "insect screen" and tie it to the
> > engine ground, water tank, etc with 3" copper straps and pull it all
back to
> > a single point at the tuner.
> >
> > Opinions?
> >
> > Jerry Peters
> >
> >
> >
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> > .
> >
> Jerry
> RF only uses the skin of a conductor therefore surface area is the only
> consideration. A 3 inch copper strap has the same surface area as a 1.8
> inch diametre cable and is a lot cheaper. The reason a wire is not
> recommended is that it would not have enough surface area to serve as an
> effective counterpoise. If component wires were invisable to RF how
> would they build a radio?
> Keep the counterpoise below the waterline if you want it to work.
> Remember you are coupling the RF to the sea through the counterpoise.
> I use a dozen capacitors to attach the 3 inch counterpoise strap to the
> tuner 3 inch ground strap. There is a 1/16 inch seperation between the
> straps which is bridged by the capacitors.
>
> --
> Brian Stewart
> Pilgrim
> Whitby 42 #304
> VB8320 VA3PIL
>
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