[TowerTalk] Beam headings and sunrise vs sunset grey-line paths

[David Robbins]

agreed.  sunset greyline to VK6 from New England if following the terminator would be south east but often signals are better from the east or even northeast
perpendicular to the terminator.  greyline periods can also result in other odd shifts, long path being better than short, and weird stuff.  w1gg used to tell of how 
he beat most of the big New England stations to some deep Asian rare country one morning because he just had a vertical... when the dx asked what his antenna
was and he said vertical he said you could hear rotors spinning all over the region trying to find what path was better.


Jan 14, 2016 01:42:10 PM, xdavid at cis-broadband.com wrote:



Grey line propagation doesn't necessarily involve signal traveling ALONG 
the grey line. In fact, I would guess it typically does not. Chordal 
hop enhancement requires a sloped F-layer, which would more likely 
involve signal paths more perpendicular to the grey line.

73,
Dave AB7E



On 1/14/2016 5:49 AM, dw wrote:
> Hi All,
> At Sunrise the grey-line path in January seems to be traveling NE by ~25
> degrees and SW by 205 degrees.
> At Sunset its traveling NW by 335 degrees and SE by 140 degrees.
>
> In general great-circle propagation information indicates that the
> predominant path from New-England to Japan would represent a beam
> bearing of NW 335 degrees. And at sunset New-England time, I have found
> openings into Japan to confirm that.
>
> So what about New-England to Japan at sunrise, which if one follows
> grey-line, would seem to indicate that a beam heading of NE 25 degrees
> would represent the heading of maximum signal strength following
> grey-line at that time of day.
>
> I'm wondering how that plays out....what have you experienced?
> Thanks
> N1BBR

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