Re: NEC-LIST: Modeling ferrite loop ant

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.
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