[Antennas] EH-Antenna Test Article On eham

2003年4月05日 18:57:28 -0800

At 04:19 PM 2003年04月03日 -0800, you wrote:
>Chris,
>>Ah, you have touched on the difference between science and necromancy.
>>Cheers for now, 73,
>Adam VA7OJ/AB4OJ
Now, how do I, just a student of electronics, attempt to explain to Adam, a 
guru, my thoughts? I repect your experience and wisdom in the field, 
however, I have to take exception to "... the difference between science 
and necromancy.".
I shall take that what you meant by 'necromancy' you meant 'magic' or 
'sorcery', not 'the fortelling of the future by communicating with the 
dead'; and, by science, you meant, ' knowledge of general facts, laws and 
relationships that is obtained through systematic observations and 
experiment, especially as applied to the physical world and the phenomena 
associated with it'. Further, 'magic' as 'something that produces results 
by mysterious influence, unexplained power'.
 From this, I would say that you and I agree that the EH antenna is magical 
as no one can really explain it. Using present equations and Poynting 
vector doesnot. Then is it wrong? Or is it right? We will find out 
later. If it works then an explaination shall have to be devised.
A few moons ago, a number of us were preparing for an exam in physical 
optics. The question was asked, "When do we use the wave theory of 
light or the particle theiory of light?'. The answer, 'Use what gives you 
the correct answer.'.
Or when I built my crystal radio, I had comments on why use a piece of ore 
for your radio, be modern and use a tube (valve). Well, most diodes 
nowadays are based upon the that hunk of galena. Or when only a 1/4wl 
vertical was an antenna. Wow, what happened when Yagi-Udal started to show 
their antenna? Was that magic?
So, basically, what I am saying, I think, is;
If it works lets try using it then explain somehow how it works.
That poynting vector is magic even though it (a vector) does point. I have 
not fuly grasped it so it must be magic. Why do some call a small loop 
antenna a magnetic loop? I thought that all antennas had both the E and H 
vectors?
Chris opr VE7HCB