Berichtdoor sparkycivic » ma 16 apr 2018, 00:41
The top mark on the lnb should be aligned according to your longitude, and usually just takes the approach of trial-and-error. some dishes don't have any marks for skew, so you will be stuck with trial-and-error.
For my location at 100'W, it ends up being just slightly east of vertical, which is roughly 13.3 degrees clockwise(me looking at face of dish) from where had been for 113W.
If you have a spectrum analyzer, you can use it's display to easily adjust the lnb skew to achieve the maximum amount of difference between the signal peaks, and the valleys in-between.
you can use websites like "satbeams" or "dishpointer" to predict the lnb skew for your location and satellite.
So to answer your question: the skew readings from websites seem to be given clockwise from the perspective of the person standing looking at the face of the dish, so -10 degrees the top of the lnb would be toward your left, and =10 degrees would make the top of the lnb on your right.