LNB Skew on Motorised Dish

Just occurred to me whilst looking at motorised dishes that I don't know how the LNB skew is correct for different satellites. How does LNB skew work on a motorised dish?

Does the LNB somehow rotate on the end of the dish or is it fixed in place and the whole dish rotates as well as following the arc when switching satellites? Does the dish need to be perfectly round or would the oval dishes be OK?

Thanks.
 
Back
Top