[Lowfer] Guided Waves

[Bill Ashlock]

>One thing to keep in mind : This very good article had mainly to do with=
 Very low frequencies

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, typ=
ically 15k to 25k, is mentioned frequently in Lewis's article but only in=
 the context of where the identified effects come to an end. An example i=
s the effects of sunspots, diurnal, and magnetic cycles, in the forth par=
agraph. The author states that these effects become less pronounce as you=
 reach 15 to 25k.

I was most surprised by the author stating that there is no skip distance=
 in our band because the wave is always returned at all angles of inciden=
ce. I verified this by checking my propagation text book. I also noted th=
at skywaves do not have to  bounce but can simply follow confining concen=
tric spheres - the earth and the ionosphere.

I keep thinking about the difference between the loop with its wide depar=
ting angle of radiation and the vertical with a much narrower angle. I su=
ppose the radiation from the loop could have certain angles that would nu=
ll out with other angles of radiation and at some distances in the path t=
his would add up to less signal. .....But it's also possible that other a=
ngles might see re-enforcement and thus have an advantage over the vertic=
al!  Mitch, this is where we could be matching up. =20

BillGet more from the Web.  FREE MSN Explorer download : http://explorer.=
msn.com


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