I was using, an 18" round dish, with a Ku LNB, a PM 900 motor and a Pansat 2700 A, which worked very well. To try to get better reception from some birds and to elimate weather fading, I switched to a Fortec 90cm offset with a standard LNB. Now, I cannot find any signal. Level stays around 74, but I cannot pickup ANY signal at all. How is this dish "offset"? I just thought the LNB was offset. Is it more to it than that? I read somewhere, afterward I bought it, where the dish is offset 22 degrees lower (?); ie: it is set at 22degrees lower and not pointed straight at the satellite... Could that be correct? Thanks.
When they talk about signal OFFSET, that have to think about signal transimitte in a spherical . which radiates is equally in all direction . But if you try to get signal from DN or DTV .. this is direct signal, you are dealing with the directivity is a measure of its ability to direct signal energy in a limited direction .
so you need to point your dish correct of direction which SAt is located . Of course few angle error is OK because big dish will get it . May be this is they called OFFSET because signal reception is not right at center point (not right in direction) , but on the edge .