Fw: [Elecraft] One-Way Propagation?

[Geoffrey Mackenzie-Kennedy]

Sorry about bandwidth, my post got lost.

73, Geoff
GM4ESD

----- Original Message ----- 
From: "Geoffrey Mackenzie-Kennedy" <gmk at gm4esd.fsworld.co.uk>
To: "Elecraft Discussion List" <elecraft at 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 <wb5gwb at optonline.net> 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.
>