On Jan 23, 8:35*am, Cecil Moore wrote:
Yes, signals traveling in opposite directions don't interfere.
Call this assertion A.

Consider two antennas several wavelengths apart and driven with
the same frequency. Exploring the field strength far from the
antennas we find regions with zero field strength (nulls) and
regions with increased field strength. This variation in field
strength is usually ascribed to interference and the pattern
of variation is often called an interference pattern.

Similar results can be observed with light (google "two slit
experiment").

Locate one of these nulls far from the antennas and follow it
back towards the antennas. Eventually you will be on a line
between the two antennas.

From assertion A above, is it your contention that far from
the antennas it is "interference" that causes the variation
in field strength, but that on the line drawn between the two
antennas some other mechanism is responsible?

If so, what is the other mechanism? And does it only work
exactly on the line, or does it start working when you get
close to the line? How close?

Now I suggest that interference works just as well on the
line drawn between the antennas as it does every where
else and the conditions along that line are not a special
case.

That said, when we look at the two slit experiment, it is
generally agreed that the photons are redistributed such
that there are no photons in dark regions and more photons
in the bright regions.

On the line drawn between the two antennas, there are dark
regions and bright regions (the standing wave). By analogy,
there are no photons in the dark regions and more in the
bright regions. But the photons from the two sources were
travelling towards each other. What is the mechanism that
redistributes the photons such that there are none in the
dark regions? Do the photons stop and not enter the dark
region? Or do they turn into 'dark photons' as they
transit the dark regions? What are 'dark photons'?

...Keith