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

[David Gilbert]

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