[time-nuts] New NTBW50AA
quartz55
quartz55 at hughes.net
Sun Sep 15 20:11:22 UTC 2013
Yes, I know it's not just the height of the trees, but the distance away and I'm really only getting 50-60' away at most and the hill is steep, it's about 20° in the worst spots. This is not your flat suburban lot, it's in the foothills of the Blue Ridge. The only flat spots are where we've made them. I'll have to go out and do a visual survey to see which one actually gives more free sky from say 20° up. Right now I'm tending towards the one towards the fence because it's not on the beam mast. But I'll let this survey finish. The WX is going to be good enough the rest of the week it'll be good outside working WX.
It looks like the fence is really only 15' lower, if I put it at the arrow between those 2 gardens, I can keep the coax run at 100' and still have it up maybe 15'. http://i251.photobucket.com/albums/gg287/DogTi/time/land_zps9ee07b7a.jpg
Dave
It's not just the height of the trees, it's the horizontal distance
from the antenna location to the trees, too -- the elevation angle
above the antenna location (elevation = arctan (tree height/distance
to trees) (in this case, "tree height" means height of the trees
above the horizontal plane of the antenna, so it includes any
difference in the ground height at the tree location, as well).
At the end of the day, you want the most open sky you can get,
particularly the southern hemisphere of sky, but the lowest
elevations (say, under 20 degrees elevation) are not nearly as
important as 20 through 90 degrees.
Best regards,
Charles
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