Jeff, as Kevin says 'you will find odd occurrences', and so called 'One Way
skip' does occur probably more often than people used to believe. There are
several explanations as to how this could take place which are too lengthy
to discuss on the Reflector, but one thing is for certain which is that the
more people find out about "Propagation", the less we really know! As Kevin
says the ionospheric layers are usually oddly shaped and constantly in a
state of flux and do not resemble those squeaky clean things seen in many
text books. To add to the mix layers within a layer will quite often appear
at some time of the day centred over one or more places on the planet. Out
of this confusion it is possible to find the path that a signal might follow
from A to B, and why a signal from B to A might start off using the same
path back to A but is refelected to another path back to earth and is not
heard at A, but might be heard somewhere near A. This is part of the story!
73,
Geoff
GM4ESD
On Friday, December 01, 2006 3:17 AM, Kevin KD5ONS wrote:
Howdy Jeff,
If you get on 20 meters in the morning, while you are in the early
morning hours and the operator with whom you are working is in an area
later in the day, you will find some odd occurrences. Some days you hear
better than the other op and some days it is the reverse. The ionosphere
is not a perfectly spherical reflector. From empirical evidence I have
found it to be quite oddly shaped indeed. Think of the layer you're
bouncing your signals off as a boiling layer where the surface changes
direction rapidly.
<snip>
As far as being truly one way? Occasionally I hear ops extremely well
but they cannot hear me. I hope it is not that they are ignoring me but
simply cannot hear me. This is what I call one-way propagation.
> On Thu, 30 Nov 2006 17:05:12 -0800, Jeff <[EMAIL PROTECTED]> wrote:
Is there really such a thing as one-way ionospheric propagation? My
intuition says no, but I don't have the physics knowledge to back it up.
On the other hand, sometimes it sure seems that stations who ought to be
able to hear my QRP signal cannot.
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