N9NEO wrote:
I remember them telling me in school - GO BADGERS! - that in order to
have a field that was not static there had to be both H and E
components. Is it possible to have a field in the MHz range that only
has one component? either B or E? I don't think so.

The time change of E or B produces a perpendicular B or E, which is
what gives a wave equation. I think Maxwell intuited that as a
``displacement current'' necesssary to account for the circuit
completion in charging a capacitor. Anyway it turns it into a wave
equation, which I think he also noticed.

Think dE/dt=-B and dB/dt=E and notice that cos(t) and sin(t) are a
solution.

The actual equations have a curl to turn it into something involving
space as well.

If it's changing, it propagates.
--
Ron Hardin


On the internet, nobody knows you're a jerk.

In article . com,
N9NEO wrote:

On Jun 11, 11:53 pm, Telamon
wrote:
In article ,
"Bruce Atchison - author" wrote:

Greetings;

Thanks for bringing this to our attention. If the energy stays near the
coil, how would it interfere with HF? It would be interesting to learn
more
about the science behind this research. It would be interesting to have
a
shortwave radio at the lab and hear what happens.

This is a workable concept over a short distance; the shorter the
better. A practical example would be a induction stovetop where the pan
is right on the other side of a ceramic top from the induction coil.
Many people have these but a drawback is that you have to have iron,
copper or steel cookware. Glass or ceramic pots and pans won't work.

The idea is to put all the power into an induction field and not radiate
the energy to a greater distance than 1 wavelength of the operating
frequency. Energy in a local induction field does not leave the local
circuit. A local power induction field could easily cause a radio not to
function and even damage it.

This is not workable over the distance of a house. The power induction
field would have to saturate everything in the house including people.
Currents would flow in any conductor and heat it up.

Sounds fishy to me, and yes any iron in it's way is going to suffer
eddy current and Hystersis losses and heat up. Could cook some eggs
on the hood of your car on a cloudy day maybe.

I remember them telling me in school - GO BADGERS! - that in order to
have a field that was not static there had to be both H and E
components. Is it possible to have a field in the MHz range that only
has one component? either B or E? I don't think so.

B=Mu*H

Here is a link that explains how induction cook-tops work.
http://www.ece.mtu.edu/~mtromble/induction/cooktops.html

--
Telamon
Ventura, California

My next oldest sister and her hubby own a kitchen induction kitchen
stove.What I wants me is an induction speaker I can put by the window in
doggys front bedroom so I can blast some Scotland and Ireland music to
them divorced wimmins when they are over there next door to me.
cuhulin

On Jun 11, 2:42 am, "Michael A. Terrell"
wrote:
Bruce Atchison - author wrote:



Greetings;

Thanks for bringing this to our attention. If the energy stays near the
coil, how would it interfere with HF?

How are you going to get it to "stay near the coil" and still couple
any energy into the other end? In fact, at that frequency it is
impossible to get much efficiency, so that majority of the RF will be
radiated. According to the article, the made id a whole six fet. To
double that distance, they would have to put four times the energy into
the system. There is enough inefficient crap on the market already. If
that idiot can't remember to charge his cell phone, then he doesn't need
it. If he's that absent minded, he shouldn't be allowed to drive, or
maybe be allowed out of his house.

Lets see my little Braun {Electric} Toothbrush already
uses Inductive Coupling {Wireless} to Charge the
Toothbrush while it is in the Cradle - Don't know the
Frequency but it is a no-contact re-powering system
for Battery run devices.

All this system does is up's the Frequency and extends
"The Gap" plus allows Power as you use it without an
Internal Battery. But at 40% Power Transfer Efficiency
a 60 Watt Light Bulb whould require 150 Watts of Source
Energy to power it. That's 150 Watts of ERP being
Generated within a House or Business : Even with only
a 10% Usage Factor thats a lot of RFI for a Nation Wide
deployment of this system.

we are doomed ~ RHF