I think there would also be a manufacturing tolerance to allow for. Having said that, my 31" and 33" dish elevation markings are within about 1º accuracy.
The other possibily can be a mast not plumb or level. But perhaps we can discount that because a seasoned installer would insure the mast is perfectly plumb.
Iinteresting though, my Ariza dish has the same measurement of 33.5" from top of dish to tip of LNB bracket, and the elevation marking is correct. Yet Polygver's dish with the same measurement is out on the elevation marking.
Am I correct in assuming as long as all the mirror spots hit the LNB plastic cover that a tight grouping is not all that important since the beams are ducted to the antenna in the bottom of the LNB housing?
The other possibily can be a mast not plumb or level. But perhaps we can discount that because a seasoned installer would insure the mast is perfectly plumb.
Iinteresting though, my Ariza dish has the same measurement of 33.5" from top of dish to tip of LNB bracket, and the elevation marking is correct. Yet Polygver's dish with the same measurement is out on the elevation marking.
Am I correct in assuming as long as all the mirror spots hit the LNB plastic cover that a tight grouping is not all that important since the beams are ducted to the antenna in the bottom of the LNB housing?