Re: NEC-LIST: Modeling ferrite loop ant

Prof Duncan Baker wrote:
>
> Hello Rob.
>
> I refer you to "An Underground Antenna" by Fessel, Meyer and Mo"ller,
> presented at the SCAR Symposium on "TEchnical and Sientific Problems
> Affecting Antarctic Telecommunications," Sandjeford, Norway, 10-16 May,
> 1972. They report on an 80 element array of magnetic dipoles. The
> magnetic dipoles were constructed of 25 ferrite tubes with a diameter of 3
> cm, making up a rod of 1 m long. Initial mu =300, with a relative
> dissipation factor of 4.2 X 10^-5 at 1.5 MHz.
>
> Best regards,
> Duncan Baker.
> ----- Original Message -----
> From: "Rob" <rob_at_pythonemproject.com>
> To: <nec-list_at_gweep.ca>
> Sent: Saturday, November 30, 2002 4:14 PM
> Subject: NEC-LIST: Modeling ferrite loop ant
>
> > Does anyone know how a sim of this could be done?
> >
> > Perhaps WIPL-D???
> >
> > I have a very large magnetically loaded loop. I took 30 Amidon
> > FT184-15 cores (may even be larger cores, I forget) and glued them
> > together to make a rod, inside an ABS tube. Then I added two windings
> > that each connect to 1/2 of a giant (>2000pF) dual gang broadcast cap.
> > A third very small winding is the output, and it is connected to a
> > series variable cap to get me to 50ohms. The antenna is very well
> > balanced.
> >
> > Unfortunately, even though electrostatically shielded, I found that this
> > loop had to be way far away from the house to keep it from picking up
> > magnetic signals in the near field, like light dimmers, computers, etc.
> > But once away from the house, I could hear lightning crashes on 160M
> > that I couldn't hear at all on a 1/4 wavelength vertical ant.
> >
> > Rob.
> > --
> > -----------------------------
> > The Numeric Python EM Project
> >
> > www.pythonemproject.com
> > --
> > The NEC-List mailing list <nec-list_at_gweep.ca>
> > http://www.gweep.ca/mailman/listinfo.cgi/nec-list
> >
> >
Thanks!! I will check it out. Rob.

ps. so someone has a bigger one than me :)

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