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: [email protected]
> [mailto:[email protected]] On Behalf Of Wolfgang Büscher
> Sent: Sunday, January 13, 2019 5:58 AM
> To: [email protected]
> 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:[email protected]
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