Topband: Re: long path in sunlight

[Roger Graves]

Bill,
I suggest that one should not discount paths (long or short) on 160 where 
part of the middle of the path is in sunlight. All this means is that the
signal 
can not make ground reflections in this region because the E layer will 
reflect the signal back up, topside reflections. Actually, these topside E 
layer reflections are just what is needed for E to F layer ducting 
propagation with very low loss (since there is no passing thru the 
absorptive D layer). Thus, long path thru the South Polar daylight region is 
quite possible on 160. The long path qso's I have had from BC to EU on 80 
around my sunrise, if they are true great circles, often go thru regions 
where E to F ducting appears to be the only viable mode, and this low loss 
mode is consistent with observed high signal strengths.

Rod  VE7VV



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