On May 9, 7:13*pm, "Szczepan Bialek" wrote:
*"K1TTT" ...
On May 9, 10:30 am, "Szczepan Bialek" wrote:



"tom"
se.net...

On 5/8/2010 2:04 PM, Szczepan Bialek wrote:

Yes. But one end of the dipole may have the better conditions to
propagate.

if it only moves in one direction as it would have
to in a monopole there is no wave only a simple field.

I am writing about a dipole with one end visible and the second
shielded.

In nature is always as you wrote. The both ands are always "visible"..

Light is always directional. Radio waves can be omnidirectional.
Of course light is emitted by many dipoles. Radio waves by halve, one,
two
(circular polarity) or many (phase radar).
S*

Astonishing understanding of the subject.

Light is not coherent. So dipole radiate for very short time.
Radio waves are coherent and can be from one source. It is easy to analyse
them.
Are they transversal?
S*
light can be coherent, what do you think lasers are?

"The most monochromatic sources are usually lasers; such high
monochromaticity implies long coherence lengths (up to hundreds of meters).
For example, a stabilized helium-neon laser can produce light with coherence
lengths in excess of 5 m. Not all lasers are monochromatic, however (e.g.
for a mode-locked Ti-sapphire laser, ?? ? 2 nm - 70 nm). LEDs are
characterized by ?? ? 50 nm, and tungsten filament lights exhibit ?? ? 600
nm, so these sources have shorter coherence times than the most
monochromatic lasers". From:http://en.wikipedia.org/wiki/Coherence_(physics)

Up to now light is not coherent. But in future who knows.
S*

if you are going to be that critical then its hard to call radio waves
coherent either. every transmitter has some drift, phase noise, or
harmonic content that distorts the pure sine waveform one way or
another making them incoherent in longer periods, the same way there
is noise and incoherence in lasers... nothing is perfect.