Originally Posted by
hinekadon
lets change the view, once the signal is in the feedhorn theres nothing to do ! so getting the desired signal into the throat , true and square to the dish is critical . next is the out ouf band or unwanted signals that get into the throat , this is the area that your supadupa rings work by not allowing the feedhorn to "see" them because the more signals the lnb sees the more it has to work and is amplifying unwanted signals and noise , If it only has to work on the signals you want then it produces more gain for your wanted signals . the reason the standard is "Easy" is because there is no linear rejection . the longer the rings the more rejections so it has to be mounted in a more exact position . if you put those little mirrors on your dish you can see any out of position errors and correct them you will also see any mis-alignment as well ok ?don
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