Sorry about bandwidth, my post got lost.
73, Geoff
GM4ESD
----- Original Message -----
From: "Geoffrey Mackenzie-Kennedy" <[EMAIL PROTECTED]>
To: "Elecraft Discussion List" <elecraft@mailman.qth.net>
Sent: Friday, December 01, 2006 12:46 PM
Subject: Re: [Elecraft] One-Way Propagation?
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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