"Brian Reay" wrote in message
...

His whole grasp of antenna theory is flawed.
He was trying to (indirectly) argue the other day via his his
interpretation of Maxwell's Equations you could generate an EM wave
by waving a magnet about. When corrected, he introduced another
variation.

Well, Brian, M3OSN, Old Chum, as was pointed out to you, all of your
posts these days are personal attacks aimed at one or another.

Why do you behave like that?

Certainly, as I corrected myself, if you wave a magnet about fast enough,
say, 1000,000,000 times per second, you will certainly generate an EM wave
and no-one has corrected me on that point because that point is true.

"gareth" wrote in message
...
"Brian Reay" wrote in message
...
His whole grasp of antenna theory is flawed.
He was trying to (indirectly) argue the other day via his his
interpretation of Maxwell's Equations you could generate an EM wave
by waving a magnet about. When corrected, he introduced another
variation.

Well, Brian, M3OSN, Old Chum, as was pointed out to you, all of your
posts these days are personal attacks aimed at one or another.

Why do you behave like that?

Certainly, as I corrected myself, if you wave a magnet about fast enough,
say, 1000,000,000 times per second, you will certainly generate an EM wave
and no-one has corrected me on that point because that point is true.

I think your arms would start to ache quite quickly.
--
;-)
..
73 de Frank Turner-Smith G3VKI - mine's a pint.
..
http://turner-smith.co.uk

"FranK Turner-Smith G3VKI" wrote in
:

Certainly, as I corrected myself, if you wave a magnet about fast enough,
say, 1000,000,000 times per second, you will certainly generate an EM wave
and no-one has corrected me on that point because that point is true.

I think your arms would start to ache quite quickly.


Just a tad...

Why would waving a magnet, at ANY speed, do it? I never heard of such. Got to
be a stationary conductor involved too, somewhere very nearby. The speed
would have far less to do with anything than the matching of kinetic energy
into the conductor, and the matching of that to whatever part of that
conductor is an antenna.

A magnet moving on its own reminds me of the question 'what is the sound of
one hand clapping?'

Brian Reay wrote in
:

Why would waving a magnet, at ANY speed, do it? I never heard of such.
Got to be a stationary conductor involved too, somewhere very nearby.
The speed would have far less to do with anything than the matching of
kinetic energy into the conductor, and the matching of that to whatever
part of that conductor is an antenna.

Not a moving conductor, a changing electric field.


I mentioned stationary conductor, but my example was not rigorous..

He also seems to think that it is frequency which determines if it is an
EM wave, why else the
comment re fast enough. You can have a ELF radio wave, I know of
amateurs with NoVs to operate
around 9kHz.


Exactly so. That's what I was gettign at, that speed in itself means nothing,
it only becomes important when calculations need a frequency.


A magnet moving on its own reminds me of the question 'what is the
sound of one hand clapping?'

An apt comment.

On Sat, 08 Nov 2014 06:41:10 -0600, Lostgallifreyan wrote:

An apt comment.



And somewhat too deep for this conversation :-)



--
M0WYM

"Brian Reay" wrote in message
...

He isn't the first fool to think he could generate an EM wave breaking
Maxwell's laws.

You continue to be the one who originates ths abuse that you seek to lay at
others'
door, and you continue to misunderstand Maxwell.

The changing magnetic field cause by rotating a magent at such a speed that
it would cease to be a short antennae will create a changing electric field,
as described by Maxwell

He also seems to think that it is frequency which determines if it is an
EM
wave, why else the
comment re fast enough.

Once again you misunderstand, and knowing you, it is a deliberate
misunderstanding
to give you the chance to be abusive. As to fast enough, see the comment
above re
no longer bing a short antenna.

A magnet moving on its own reminds me of the question 'what is the sound
of
one hand clapping?'
An apt comment.

Two ignoramuses do not make for a knowledgeable person.

On Sat, 08 Nov 2014 17:46:57 +0000, gareth wrote:


Two ignoramuses do not make for a knowledgeable person.

Neither does one really fat ignoramus, so it seems.

In rec.radio.amateur.antenna gareth wrote:
"Brian Reay" wrote in message
...

He isn't the first fool to think he could generate an EM wave breaking
Maxwell's laws.

You continue to be the one who originates ths abuse that you seek to lay at
others'
door, and you continue to misunderstand Maxwell.

The changing magnetic field cause by rotating a magent at such a speed that
it would cease to be a short antennae will create a changing electric field,
as described by Maxwell

Babbling nonsense, gas bag, and if you actually understood Maxwell you
would know why.

He also seems to think that it is frequency which determines if it is an
EM
wave, why else the
comment re fast enough.

Once again you misunderstand, and knowing you, it is a deliberate
misunderstanding
to give you the chance to be abusive. As to fast enough, see the comment
above re
no longer bing a short antenna.

Yet more babbling nonsense, gas bag.

A permenant magnet is NOT an antenna of any sort.


--
Jim Pennino

Jeff wrote in :

On 08/11/2014 17:46, gareth wrote:
"Brian Reay" wrote in message
...

He isn't the first fool to think he could generate an EM wave breaking
Maxwell's laws.

You continue to be the one who originates ths abuse that you seek to
lay at others'
door, and you continue to misunderstand Maxwell.

The changing magnetic field cause by rotating a magent at such a speed
that it would cease to be a short antennae will create a changing
electric field, as described by Maxwell


For once have to agree with Gareth, a rotating magnet will cause EM
radiation.

Jeff



*silently munches popcorn, waits for picture to start*

Jeff wrote in :

For once have to agree with Gareth, a rotating magnet will cause EM
radiation.


Ok, maybe so. Is this right...? Suppose a wire is part of a closed circuit,
that magnet would certainly induce current. Now, if that wire were NOT
closed, but in the form of some antenna, then at an appropriate frequency, in
the part of an antenna that normally sees current (at the feedpoint end), you
would see a current, thus all the other attributes of an antenna subject to
an electromagnetic field would also exist? IF (I'm not stating, just trying
to follow a thought based on what you said), IF this is so, then it would
mean the EM wave existed with or without the wire, purely because the magnet
was spinning.

Alternatively, does it just mean that an alternative magnetic field near an
antenna feedpoint is as capable of inducing a signal out of the antenna as an
electromagnetic wave is?

Maybe I should go back to my popcorn. I may not even understand what I see,
but I want to watch.