A friend of mine worked on that long antennae in Michigan.  If I remember
right, the frequency is TENS of hertz, not kilohertz.  55 hertz or
something! This was about 1979.

He was hired to build a machine to find underground breaks in the antennae,
by measuring differential voltages in the ground.  He found out the hard way
that you could simply walk around barefoot and find them just fine.  After
dancing around a bit, you'd end up facing either exactly toward or exactly
away from the break, your feet placed firmly on an equipotential line.  If
one foot was closer to the break, you'd get a powerful shock!

He proposed that you could find breaks by hiring a team of barefoot hippies,
walking them along the antennae line until they all started dancing around
and facing in a circle.  Of course, they might do that anyway....

-- Lawrence Lile

----- Original Message -----
From: "David VanHorn" <dvanhorn@CEDAR.NET>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Tuesday, July 10, 2001 11:45 AM
Subject: Re: [EE]: Underwater RF


> At 11:13 AM 7/10/01 -0400, Olin Lathrop wrote:
> > > No doubt billions of $$$ has been spent by the Navy. Don'cha know 8^)
> >
> >I thought the navy used very long wave transmission at a low data rate to
> >send messages to its submarines (when they can't surface).  I remember
> >hearing there is an antenna many miles long on the upper penninsula of
> >Michgan for this purpose.  Of course, you never know how real or unreal
> >things are you "hear" about military projects.
>
> It's real. I used to live near one facility at Lualualei.
> 1MW at something like 19 kHz.
> The newer ones are even lower freq, and I think more power.
>
>
> --
> Dave's Engineering Page: http://www.dvanhorn.org
>
> I would have a link to http://www.findu.com/cgi-bin/find.cgi?KC6ETE-9 here
> in my signature line, but due to the inability of sysadmins at TELOCITY to
> differentiate a signature line from the text of an email, I am forbidden
to
> have it.
>
> --
> http://www.piclist.com hint: To leave the PICList
> mailto:piclist-unsubscribe-request@mitvma.mit.edu
>
>

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