Spyguyfred, I recently installed my first FTA motorized system, and there are a few things that can cause confusion when alligning a dish.
The main thing is the fact that when the dish is pointed at a particular satellite, it is sometimes possible for a blindscan to find channels that are being broadcast from an adjacent satellite. This can make the installer think he is pointing at the wrong satellite, when in fact, he is pointing at the correct one (and vice versa).
For example, when I pointed my dish at AMC 1 at 103 degrees, the blindscan picked up the "Congratulations! You have a SuperDish pointed at 105" channel that is broadcast from AMC 15 at 105 degrees.
Also...all those Middle Eastern channels at the 97 degree position.....they also appeared when I blindscanned the 95 degree position satellite.
This phenomenon probably has two causes: One would be limitations in a dish's focusing ability. The second is the fact that some adjacent satellites use the same polarity for the same frequency. Thus consumers' receivers can't use polarity as a means of blocking the signal from the adjacent satellite. This is just my theory. I'm not a satellite expert. But just looking on Lyngsat , comparing frequencies and polarization of some particular adjacent satellites, I'm confident that my thinking is correct.
Other sources of confusion:
When setting the elevation of a sg2100 (or other motor) the tightening bolt is NOT the marker for the elevation scale. The marker is the little raised arrow molded into the motor casting.
The pole mount of the sg2100 is too flimsy. If you tighten the upper bolts tighter than the lower bolts, then it will make the elevation scale be off by a few degrees. Ideally, it's best to set the elevation with an inclinometer.
Extensive allignment instructions have been given on this site by people with much more experience than I have. Nevertheless, I think maybe you can gain a few insights by reading my suggestions below.
Set the motor's elevation as accurately as possible.
Set the dish's elevation according to instructions.
"South" can't be accurately found by most people using a regular compass. Thus this method can be used: In your FTA receiver, enter the latitude and longitude of your location. Determine the satellite that is closest to south from your location. It must be a Ku satellite that has an active transponder on it. (Look on the Lyngsat site.) In your FTA receiver, set the motor up for USALS. This will cause the motor to rotate to where the satellite is (once you have the motor body itself pointed straight south). Set the frequency to that of a known active transponder. Next Rotate the motor body on the pole until you get the strongest signal. "If" you are pointing at the correct satellite, then your motor body is now pointed straight south. Next, determine if you are actually pointing at the correct satellite by doing a blindscan and comparing the resulting channels to the ones that Lyngsat says should be on that satellite. Keep in mind that sometimes channels on adjacent satellites can appear on blindscans. This can be very confusing. If you think you are pointed at the right satellite, then fine tune the elevation of the dish itself for maximum signal, and tighten down the motor clamps to the pole. Blindscan several satellites close to south. If their channels are in agreement with those listed on Lyngsat or other sites, then all is well. But if the programs are generally "off" by one satellite postion (using the Lyngsat or other information), then you probably pointed the motor 2 degrees west or east of true south.