Takeoff Angle Path Analysis on 160M for EU and 40M for ZS and 3Y0Z

Last night, when I saw quite a few spots between Washington State, Montana and parts of Oregon – where they were working EU and Scandinavia on 160M. I am getting excited because maybe we will get some of that here at Chez KY6R . . .

I wanted to use Google Earth (Classic) and check to see which direction 10 degrees is – and what is in the way – and what take off angle(s) would help. The answer is that there is a hill that goes almost straight up and is 17.2 degrees up to the top of the hill from my QTH. The Mod Bob is oriented East and West, and it just so happens that on 160 and 80 the azimuthal pattern is omnidirectional!

On 40M, my array has an end fire direction that is toward EU, and I do just fine getting over that hill, so  think I will do it and soon. The plots from DXE on the 40M array say this:

So, that clears the hill – more than I had expected it would.

The Mod Bob was great for FP – but FP has a smaller hill with a more gradual climb of 21.8%:

Lets look at the Mod Bob plots:

For FP, it was great (non polar route), and its takeoff angle peaks at about 25 degrees – which means it clears the 21.8 degree hill top in that direction.

Lets look at the main broadside lobe (directional broadside on 40 and 30M) – east and west, and which is close enough to how my 40M phased verticals are oriented in the broadsided direction. 17 degrees – which means the Mod Bob clears everything it needs to to get to ZS or 3Y0B, and on any of the low bands! OK – how about the Long Path to ZS? So low (2 degrees) that it doesn’t matter at all, and hence why I did so well with VK0EK and FT5ZM and anything in that LP path to ZS. This is truly my best, non encumbered path.



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