Date: Tue, 15 Jan 2019 00:37:51 +0000
From: Chris Wilson <dead.fets@gmail.com>
Message-ID: <867997326.20190115003751@gmail.com>
To: rsgb_lf_group@blacksheep.org
In-Reply-To: <02e001d4ac4e$303c6d00$90b54700$@comcast.net>
References: <1762043626.20190104174530@gmail.com> <9554861547246900@iva5-750e13568e4d.qloud-c.yandex.net> <1075632463.27315210.1547312330961@mail.yahoo.com> <33640135.9OHUBihQns@x220> <74d0df18-0c23-3651-1c19-16a45495e0c2@freenet.de> <02e001d4ac4e$303c6d00$90b54700$@comcast.net>
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Subject: Re: ***SPAM***Re: VLF: GOTA
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Hello Jim,
 As an old, but probably now politically incorrect UK
comedian used to say used to say, "Oooh, you are awful, but I like
you".

Good  to  see  cerebral  aptitude balanced with a good sense of humour
still  here ;)

Monday, January 14, 2019, 9:14:50 PM, you wrote:

> Hello Wolf,

> If I am treading on anyone's intellectual property please advise. 
> Years ago I built a version of what you mentioned, and I don't operate it
> often because of fear of kinetic effects :-) 
> The stack of 3" diameter 1.5" thick magnets is epoxy encapsulated and
> rotates at 20 Hz inside of an enclosure with three 1/2" thick cabinet-grade
> plywood walls on all six sides of the enclosure. It is designed for several
> orders of magnitude safety margin against kinetic effects.
> It's lots of fun but I wouldn’t recommend it to anyone without access to
> lots of sandbags.

> I have a question:
> I did not strive for a high aspect ratio (I did not strive for a tube that
> is long compared to diameter) on the basis that at 1 Hz to 20 Hz the far
> field is irrelevant to most of us, and in the near field, only the volume of
> a good neodymium magnet matters:

> B  = (B_of_magnet x volume_of_magnet)/(2  x  pi  x  r^3)  

> Does this seem right? Size matters but length doesn't?

> On a related topic, I don't want to contradict your thought below, but I
> don't think that a 1.6 Hz transmitter that has the range of an ELF
> guard-rail transmitter would be made with magnets; because:
> To have such a range, a 1.6 Hz experimenter would technically need to file
> for human-subjects authorization unless the magnetic device was operated in
> the wilderness, but we read in this thread that the 1.6 Hz device is safe
> and convenient to use.

> 73,

> Jim AA5BW
>     
>   

> -----Original Message-----
> From: owner-rsgb_lf_group@blacksheep.org
> [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Wolfgang Büscher
> Sent: Sunday, January 13, 2019 5:58 AM
> To: rsgb_lf_group@blacksheep.org
> Subject: Re: ***SPAM***Re: VLF: GOTA

> Claudio - just wait until that b.s.-meter pulsates 1.6 times per second :o)

> 20 meter long tube filled with neodym power magnets, rotating at 96 RPM...
> but now we'll never get to know this top-secret technology. Harr harr.

> On 13.01.2019 10:59, Claudio Pozzi wrote:
> ...


-- 
Best regards,
 Chris                            mailto:dead.fets@gmail.com