If you go to http://www.dishpointer.com/ then set your location and pick 160E Optus D1 as the satellite you can see where it should point. If you select 156E C1/D3 you can see the difference that it needs to move - not very much, but it needs to be accurate.
The 22kHz signal (when switched on or off) is fed from your sat receiver up the cable to the LNB (the box of electronics on the end of the arm on the dish). It tells the LNB to switch between the two throats (obviously visible) on the LNB, each of which is sitting at the right point in front of the dish to receive a certain satellite. This way your receiver can select which satellite it wants to receive, assuming the dish is physically aimed in the right direction to start with.
RunningMan, I greatly admire your consideration. I made it by re-aiming and as you suggested, a little to the right. I appreciate that a lot. You made my day.
If your sat receiver has a signal strength meter, you can fine tune the dish a mm or so at a time - set it up for maximum signal strength. You'll need to adjust both left-right and up-down. You can then adjust the skew, which is rotating the LNB in it's mount - again, move it only a very small amount at a time, until you get the highest signal strength. Once you have done this, it should work well in even very heavy rain.
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