Thread: Education
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Old January 14th 08, 03:04 AM posted to rec.radio.amateur.antenna
Mike Coslo Mike Coslo is offline
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First recorded activity by RadioBanter: Feb 2007
Posts: 168
Default Education

"AI4QJ" wrote in
:

Once you understand the difference between standing waves, (which has
no real power itself but which stores the reactive VA power into that
power which is is eventually dissipated in "radiation resitance"
dissipating into free space as radiation power), and traveling waves,
which do have real power that is also disspated into that same type of
radiation power through the radiation resistance, an interesting
question becomes "what is the nature of this so-called radiation
resistance which dissipates the power of a forward wave or the stored
power in a standing wave?". We feed power into the antenna as electric
current and then it exits the antenna as radiation. Maxwell's
equations (in spite of what art theorizes) says that the power has
been converted to an EM wave. So, electric current, which is not an EM
wave consisting of photons and propagating into space, is converted
into a different form of radiation energy that IS an EM and does
consist of phtons and waves. When this conversion occurs and energy is
transmitted into free space, we attempt to quantify this net loss to
our generator with familiar terms, i.e. current or voltage dissipated
into "radiation resistance". However, we all know there is no actual
physical component known as a radiation resistor. Conceptualizing how
this power conversion works goes back to maxwell: "why" is there a
time varying EM magnetic and electric field (external waves and
photons) generated by the flow of current? Well, it could be described
as nature's tendency to maintain equilibrium. If a change is made to a
conductor by putting a current through it, nature "objects" and fights
back by setting up an EM wave that tends to cancel out the incoming
current pulse. But no matter what, I will always easily have enough
energy in my forcing function (current or voltage) to overcome
nature's objection and send a net outflow of energy occuring as
radiation theoretically equal to what I inputted.


Well put, Daniel. One of the biggest difficulties I have with Art's
theories is that I can't get my head wrapped around them. I know he
unfortunately has a few physical challenges that make his postings a
little difficult to go through at times, so I re-read them often to see
if I can glean something out of them.

But whereas I have great difficulty with some folks posts. I understand
everything you wrote.

- 73 de Mike N3LI -