"Waves of Average Power"
 

Christopher Cox wrote:
That would make a Yagi's behavior somewhat laser like. Photons would
excite a Yagi's element which would then eventually emit its own photon.
I wonder if the excited photon would be emitted in the same plane as the
received one.......Nahhhhh.

The energized electrons in the driven element emit coherent
photons some of which are absorbed by electrons in the the
parasitic elements. The energized electrons in the parasitic
elements emit more coherent photons, some in phase and some
out of phase with the driven element photons. Coherent photons
interfere destructively in some places and constructively
in other places. The result is the radiation pattern of
the antenna.
--
73, Cecil http://www.w5dxp.com

"Waves of Average Power"
 

Cecil Moore wrote:

Coherent photons
interfere destructively in some places and constructively
in other places.

What can you tell us of the incoherent ones? :-)

73, ac6xg

"Waves of Average Power"
 

"Cecil Moore" wrote in message
...
Christopher Cox wrote:
That would make a Yagi's behavior somewhat laser like. Photons would
excite a Yagi's element which would then eventually emit its own photon.
I wonder if the excited photon would be emitted in the same plane as the
received one.......Nahhhhh.

The energized electrons in the driven element emit coherent
photons some of which are absorbed by electrons in the the
parasitic elements. The energized electrons in the parasitic
elements emit more coherent photons, some in phase and some
out of phase with the driven element photons. Coherent photons
interfere destructively in some places and constructively
in other places. The result is the radiation pattern of
the antenna.
--
73, Cecil http://www.w5dxp.com

"coherent photons"

It's a laser?
Cool.

"Waves of Average Power"
 

On Oct 30, 10:00 am, Jim Kelley wrote:
Cecil Moore wrote:
Coherent photons
interfere destructively in some places and constructively
in other places.

What can you tell us of the incoherent ones? :-)

73, ac6xg

You mean the ones that have had too much cheap rum? Wait till the
next day and ask them when they have a throbbing hangover.

One advantage, at typical ham frequencies, is that you'll have plenty
of them, though you may have a hard time distinguishing one from
another.

"Waves of Average Power"
 

K7ITM wrote:
On Oct 30, 10:00 am, Jim Kelley wrote:

Cecil Moore wrote:

Coherent photons
interfere destructively in some places and constructively
in other places.

What can you tell us of the incoherent ones? :-)

73, ac6xg


You mean the ones that have had too much cheap rum? Wait till the
next day and ask them when they have a throbbing hangover.

One advantage, at typical ham frequencies, is that you'll have plenty
of them, though you may have a hard time distinguishing one from
another.

It's photobigotry. That's why those coherent ones gotta 'stick
together'. :-)

73, ac6xg

"Waves of Average Power"
 

Jim Kelley wrote:
Cecil Moore wrote:
Coherent photons
interfere destructively in some places and constructively
in other places.

What can you tell us of the incoherent ones? :-)

They are a lot like physics professors, i.e. hard to
understand? :-)

As far as RF goes, photons from a single source are
considered to be coherent with each other but not
coherent with any other photons. Photons can only
interfere with other photons with which they are
coherent.

For two incoherent light waves, the irradiance equation
is Itotal = I1 + I2, i.e. no interference term. For two
coherent waves, the irradiance equation is
Itotal = I1 + I2 + 2*SQRT(I1*I2)cos(A).
The extra term in the coherent irradiance equation is
the *interference term* where A is the phase angle
between the fields.

Have you figured out where the physical objects
are around a free-space dipole that cause the
radiation interference patterns?
--
73, Cecil http://www.w5dxp.com

"Waves of Average Power"
 

H. Adam Stevens wrote:
"coherent photons" It's a laser? Cool.

Surprise! Our $100 RF transmitters emit coherent photons just
like a $100,000 laser. Maybe we should call them RASERs. :-)
Do you remember MASERs?
--
73, Cecil http://www.w5dxp.com

"Waves of Average Power"
 

Christopher Cox wrote:
Thinking from my "Imagination", it would be cool to find a way to "pump"
the parasitic element to emit a companion photon much like the one
emitted from a atom in a lasing medium.

Are there any orbital electron energy step
functions that match RF frequencies?
--
73, Cecil http://www.w5dxp.com

"Waves of Average Power"
 

Cecil Moore wrote:

Have you figured out where the physical objects
are around a free-space dipole that cause the
radiation interference patterns?

Can't say that I have. If it's not a physical object and yet it can
be used to radiate electromagnetic waves, I'll have to rely on you to
explain how it works.

73, ac6xg

"Waves of Average Power"
 

Jim Kelley wrote:
Cecil Moore wrote:
Have you figured out where the physical objects
are around a free-space dipole that cause the
radiation interference patterns?

Can't say that I have. If it's not a physical object and yet it can be
used to radiate electromagnetic waves, I'll have to rely on you to
explain how it works.

You didn't answer my simple question on another
thread. The question is: Can interference occur
in free space devoid of any of your required
physical objects?

Example: Given a cubic meter of free space
containing no physical objects. Can interference
occur within that space? Your earlier posting
implied that interference could not occur in
free space devoid of physical objects.
--
73, Cecil http://www.w5dxp.com