[Lowfer] Guided Waves

[BOB RIESE]

Bill Said

I keep thinking about the difference between the loop with its wide
departing angle of radiation and the vertical with a much narrower angle.
I suppose the radiation from the loop could have certain angles that
would null out with other angles of radiation and at some distances in
the path this would add up to less signal

===========
DJC
actually  till we get some co located antennas to compare .. I wonder
with the small antenna sizes to wavelength I like to think that the
signal 
is coupled to the uhh eather ( in my muddled thinking ) with the antenna
acting a bit like an impedance changer, as opposed to a radiator  ?? (
what ever that means  HAR
as I said muddled ) So regardless the type of radiator used we are doing
good
just to get the signal coupled and radiating. The take off angle may be
more dependent
on local conditions , soil type, counterpose etc

============

Bill said
I was most surprised by the author stating that there is no skip
distancein our band because the wave is always returned at all angles of
incidence. 

==========
DJC
I would agree as there should be some phasing between signals 

"And combine to produce a resultant mode of propagation, however,
interference
Patterns and effects still exist."

unless this is how he explains what we would call Skip Zone

===============

Bill said

Bob, I disagree with you on this. Based on other text information I have
read, this IS mostly for our Lowfer band. The low end of the LF band,
typically 15k to 25k,

==========could be right and will be fun to see how thinking evolves 

Lyle said

"skip distance" for LF skywaves, even at night when the absorption is
lowest. At 200 km, the skywave signal is typically at least 40 dB below
the
surface-wave signal. Obviously, very little skywave signal is returned at
high angles of incidence.

==============
DJC
True and I can see a difference in signal strengths on some signals
comparing with
WA3USG we are located 25 miles apart and at some frequency I am sure I
can see 
uhh interference patterns or Skip Zone effect


Over all anything st stir up thinking is good
see what you started Lewis ; )


Bob K3DJC