[Antennas] loop vertical antenna ?

Tue, 08 Jan 2002 21:06:21 +0200

Hi Ron,

I have seen the ones you mention also, but no I mean vertical diamond shaped
loop.
If you were to look at it from the "flat" side it would go "up outwards, up
inwards, down outwards, and down inwards". I don't think the returning side
was grounded on the ship body, just on big vertical shaped in such a way to
use the main mast ??

73
Demetre - SV1ENS

----- Original Message -----
From: "Ron & Madhavi" <[email protected]>
To: <[email protected]>
Sent: Tuesday, January 08, 2002 7:29 PM
Subject: Re: [Antennas] loop vertical antenna ?

> Demetre,
>
> I am sure you are referring to verticals with diamond shaped top loadingng
> hats that were popular on cargo ships - mostly the Eastern European built
> ones. There usually are/were 10m tall verticals with the enormous
capacitive
> hats, with a hula hoop in the middle. I have had these aboard ships that
> sailed in some of the worst North Atlantic winters. In fact, it was only
the
> other night I was watching a home video taken during a storm. I had shot
the
> antenna in the wind - to demonstrate how severe the storm was!
>
> Now that most of the older antennas are being replaced by GMDSS antennas
> with auto tuners at the base, you might find one of these elements around
> Parama or Drapetzona shipyards in Piraeus.
>
> Hopefully someone might have some ideas to reduce winload on your system.
I
> had to put out my 2c worth as I think these are what you see on boats you
> refer to - and for nostalgic reasons too!
>
> 73,
> Ron, 4S7RO/6Y5
>
> ----- Original Message -----
> From: <[email protected]>
> To: <[email protected]>
> Sent: Tuesday, January 08, 2002 1:48 AM
> Subject: [Antennas] loop vertical antenna ?
>
>
> > Hi All,
> >
> > I use a 10m long vertical antenna with an Icom AH-4 tuner, and a total
of
> 6 wires laid around the antenna as counterpoise plus direct ground. The
> results are acceptable.
> > While watching my vertical being bend by snowstorm winds (worst in the
> last 50 years) I thought of maybe changing the vertical element to a
> different shape for less wind resistance and maybe better radiation.
> > I remember seeing some diamond shaped antennas on boats that resembled a
> diamond shaped loop strung on the main mast going upwards on one side and
> down the other.
> > Would a similar shaped antenna radiate better compared to a plain
vertical
> element of the same hight ?
> >
> > 73
> > Demetre - SV1ENS
> >
> > __________________________________________________________
> > Get your FREE personalized e-mail at http://www.canada.com
> > _______________________________________________
> > Antennas mailing list
> > [email protected]
> > http://mailman.qth.net/mailman/listinfo/antennas
>
> _______________________________________________
> Antennas mailing list
> [email protected]
> http://mailman.qth.net/mailman/listinfo/antennas
>