On Apr 30, 2:14*am, "Peter" wrote:
I'm preparing an article for a local radio club magazine about the nature of
radio and electromagnetic radiation in general. While this is a non
mathematical and general descriptive treatment of the subject it is a
challenge to make it clear and consistent.
I know this group has some expertise on this subject and would appreciate
any constructive comment and suggestions regarding the attached article.

http://members.optushome.com.au/vk6ysf/vk6ysf/radio.htm

Thank you for your time.

Regards Peter VK6YSF

For what it's worth...

I've often found it useful to consider alternate ways to think about
things. In this thread, there have been some comments about electric
fields, magnetic fields and electromagnetic fields. So, I ask: how
do we measure fields? As far as I know, it's by their interaction
with matter: we observe how an electromagnetic field accelerates
electrons, for example. Do we have any way other than by observing
how a (E, M, or EM) field interacts with matter to measure a field?
If not, does a field _necessarily_ have any physical reality, any
reality beyond a mathematical model to explain what we observe?

I suppose some here won't be ready to contemplate this in any depth,
though others may find it enlightening.

One might say that radio is the practical use of the observed physical
effect that accelerating charges in one place leads to free charges at
distant points being accelerated, in a manner we're able to describe
pretty accurately, so far as we know now, with our models.

Cheers,
Tom