>Having walked around on the beach with a battery K2 listening to
incoming
signals on a short antenna, walking 50 feet from the water drops signals
multiple S units."
Perhaps the handheld radio has a better ground connection, capacity
coupled
or not, through you and into the salt water + sand at the beach. Then,
walking away from the beach
that connection is greatly diminished.
73,
Charlie, N0TT
On Tue, 20 Dec 2022 08:58:23 -0500 Guy Olinger K2AV <k2av.guy@gmail.com>
writes:
> Having walked around on the beach with a battery K2 listening to
> incoming
> signals on a short antenna, walking 50 feet from the water drops
> signals
> multiple S units. Over the beach there is an absorption zone
> starting at
> the sand at water�s edge which goes higher and higher the farther
> from the
> water. This isn�t EZNEC, just observation on Core Banks, NC during
> a number
> of IOTA contests. Very easy with all those signals to hear what was
> going
> on.
>
> On 40m there was a big difference between a doublet at 40� and
> 50�, back
> from the beach about 200�.
>
> Apparently sand wetted with salt water is quite lossy.
>
> But even not optimal at the beach smacks the snot out inland
> locations.
> Which IMHO explains the wide variety of beach-based reports.
>
> Also a very short vertical radiator away from water�s edge will
> not hear as
> much as a tall one as the tall wire has more intercept outside the
> absorption zone next to the sand.
>
> It�s really quite a complex subject.
>
> 73, Guy K2AV
>
> On Tue, Dec 20, 2022 at 7:28 AM <n4is@comcast.net> wrote:
>
> > Hi Frank
> >
> > You wrote " . A vertical over a salt marsh or within about a
> wavelength of
> > salt water will produce
> > 6 dB or more of gain at low angles compared to a vertical with
> poorly
> > conducting soil in its reflection zone
> > "
> >
> > The assumption that "next to the water" is the same as "in the
> water" , is
> > a
> > not right. It is not the same !
> >
> > I listen to George signal with vertical "in the water " and the 10
> db
> > difference in signal is real. Moving the antenna on the beach and
> you lose
> > 10 db or even more on practice, not on paper.
> >
> > I see that on my S meter more than a dozen times.
> >
> > George has a vertical on his house in Miami, the ground plane is
> just a
> > plate down the water. The vertical is made with fiberglass pole
> 18m high.
> > My
> > antenna is a full size vertical with a good radial system over the
> > Everglade
> > land, if I dig 2 Ft I have water from the Everglade underground
> river.
> >
> > George can run a pile up from Europe with 10W, I can keep up with
> him
> > running legal limit power. We are talking about 160m only.
> >
> > 73's
> > JC
> > N4IS
> >
> > _________________
> > Searchable Archives: http://www.contesting.com/_topband - Topband
> > Reflector
> >
> --
> Sent via Gmail Mobile on my iPhone
> _________________
> Searchable Archives: http://www.contesting.com/_topband - Topband
> Reflector
> _________________
Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
|