koansrc
Regular Member
- Joined
- Nov 14, 2006
- Messages
- 315
- Reaction score
- 0
- Points
- 0
- Age
- 60
- My Satellite Setup
- CM 3.0m @ 28.2 w PACE
- My Location
- Athens-Greece
johnsattuk said:If the subreflector was at the same offset angle as the dish, (as is the case with a Prime dish) it would be round, but the LNB would then shadow some of the dish, thus negating the advantage of the offset.
Agreed johnsatuk. The question is how much would you gain by using a subreflector and how much would you loose by creating a shadow.
I'm tempted and thus considering this because on my "clunky" 3m Channel Master there is already a considerable shadow from the struts and the lnb holder etc and in the center of the dish there is a hole about 30cm wide, which I reckon corresponds to the shadow created by the original C-band LNBF and protective "bucket" (which is about 45cm round).
I *think* the attached excel attempts to answer the question "is it worth it" .. but it's over my head.