View Single Post
  #13   Report Post  
Old July 11th 17, 02:36 AM posted to rec.radio.amateur.antenna
Jeff Liebermann[_2_] Jeff Liebermann[_2_] is offline
external usenet poster
 
First recorded activity by RadioBanter: Jun 2007
Posts: 1,296
Default Magnetic receiving loop theory

On Mon, 10 Jul 2017 06:28:08 -0400, Pat wrote:

On Sun, 09 Jul 2017 14:29:18 -0700, Jeff Liebermann
wrote:
That should be the E and B field, not H field. My mistake.


E and H are fine. I think it depends on which books you are reading
or maybe how old you are? I remember E and H from school (a long time
ago).


At this time, I'm 25,384 days old[1]. That's long enough to have
forgotten or confused most everything which I had pretended to learn
in skool. I'm perpetually mangling the various fields. So, I decided
to search for some clarification. This is least confusing explanation
I could find:
https://www.physicsforums.com/threads/in-magnetism-what-is-the-difference-between-the-b-and-h-fields.370525/#post-2537765
I think I understand most of it, maybe, or at least some of it:
https://www.physicsforums.com/threads/in-magnetism-what-is-the-difference-between-the-b-and-h-fields.370525/
There are 114 articles in the thread, most of which disagree with each
other. That suggests that not everyone understands the various fields
in quite the same manner.

E and B are the total electric and magnetic fields.
D and H are the free electric and magnetic fields.
P and M are the bound electric and magnetic fields.?
E = D + P (except that for historical reasons E is defined
differently, so we need to multiply it by the permittivity,
and for some reason P is multiplied by minus-one).
B = H + M (except that for the same historical reasons
B is defined like E, so we need to divide it by the
permeability).

At this point, I usually say "I hope this help". However, I think
that "I hope this doesn't hurt too much" might be more appropriate.

I look forward to hearing the results. Sounds like a great
experiment.


I'll post something. Right now, I don't see it happening until after
I design and build the one, true, ultimate, and best magnetic loop
antenna. Probably next year.


[1]
http://www.calculator.net/age-calculator.html?today=01%2F10%2F1948&ageat=07%2F10 %2F2017&x=54&y=14

--
Jeff Liebermann
150 Felker St #D
http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558