[Lowfer] Alien e-probes

[Peter Barick]

>>> ashlockw@hotmail.com 09/17/03 12:14PM >>>

In order to figure out how to optimize E-probe performance it may be 
necessary to agree on a model for the wave that we trying to get a
sample 
of. So let's put aside all the back and forth questions for a moment
and see 
if we agree on the following.

-- okay, assuming also this foray will some what resolve my original
goal (remember, the GP?) and lead to denouement. ;-) 

First the surface wave:  My feeling (and this is based more on actual 
e-probing, and thinking about the data, than textbook info) is that the
LF 
wave travels along the conductive ground and the has a curved )))))))))

equal-potential cross section. When we probe the wave with antennas of

various heights (as long as they are much shorter than a WL) we measure

nearly proportional increases in strength because the voltage at any
height 
is greater than the voltage at ground level on an instantaneous basis.

-- Agree, that why I want it at top-o-tower.

Conversely if the wave moves along with a straight llllllll
equal-potential 
cross section there would be no gain when probing the wave at increased

heights. We could probe this signal with two ground mounted E-probes
and the 
differential voltage would be proportional to the spacing.

The sky wave could have a straight ////// equal-potential cross section
but 
the angle in this wave would have the same effect on the E-probe as
does the 
curved surface wave, so the voltage also increases with height.

What do you think?

Bill

-- On these points I have no basis for an opinion except that I haven't
seen the case for "straight line" waves at LF and "sky wave" at LF? I'm
not familiar with it, esp. as an expected phenomenon. So keep fleshing
it out, Bill, I wanna see where this is leading.

[flame shield activated]

Peter