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

To: towertalk@contesting.com
Subject: Re: [TowerTalk] Beam headings and sunrise vs sunset grey-line paths
From: David Gilbert <xdavid@cis-broadband.com>
Date: Thu, 14 Jan 2016 11:36:28 -0700
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>


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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