OK , does it have an arrow that shows what should be " up " ?
Your longitude is about 82 degrees ? OK , go to
http://lyngsat.com/america.html
Your due south sat would be Nimoq 2 82 or AMC 9 83 . Bot are KU , which does not help you .
The Brazilsats are C band , but I think all digital .
So I am going to suggest you try AMC 3 87 , which I think is about 3 degrees east of your due south .
Transponder 20 V is pretty strong , try for it , with the receiver and the TV outside . Put the analog receiver on channel 20 .
But here is the rub . The older analog receivers only out-put at 18 VDC So , with the LNBF , you are only going to see one polarity . If it is a newer receiver , and you have a menue choice for voltage switching , you are off to the races .
The menue on my receiver askes ir the sat has regular or reverse polarity . Here is what that means . adjacent sats usually have opposite polarity for any given TP , say TP 1 . V - H - V - H and so on from one sat to the next . This helps reduce cross talk / interfeerance from the sats on either side of the one you are aiming at .
So , after having said all that , if you hit AMC 3 TP dead on , with your LNBF , you may be on the wrong polarity , 90 degrees off .
So , if you can find what you think is your sat & TP ( channel 20 ) and you do not get a picture , try rotating the LNBF 90 degrees , left or right , it does not matter .
Is your motor controled by the digital receiver or the analog receiver ?
If it is controled by the digital receiver , set your longitude and latatude and tell the receiver to motor to 87 West . Then powred down and hook the coax up to the analog receiver .
Another way to deal with the polarity issue is to buy a splitter that blocks DC on one port ( F connector ) . Hook the analog receiver to one that is blocked , the digital receiver to the seconf one and the coax to the sat to the other port .
Now you can have both receivers active at the same time , but the LNBF is powered and polarity is controlled by the digital receiver .
If you think you are at AMC 87 channel 20 and you get nothing , go to the digital receiver menue and change from a V TP to a H , or vice versa . This should change polarity at the LNBF .
Another cheat is to rotate the LNBF to 45 degrees , this puts you half way between H and V . May not get anything on digital , but you may get a bad picture on analog , where you got no picture at all , before , if you had the polarity wrong .
Then start tweeking the polarity by rotating the lnbf either left or right .
Once you get an analog picture , you can start tweeking everything ( angles & direction ) .
Then start scanning with the digital receiver .
Here is another hint , untill you know the polarity issue is RIGHT , on digital , go into your TP menue .
On 87 AMC 3 , look at say the first TP's . APTV is H at 3715 , 3719 and 3725 . Add new TP's 3715 , 3719 and 3725 but V . ( These channels show to be un-scrambled ) . Now scan . If you are aimed correctly , you should hit them , at one polarity or the other .
You can do this on the other in the clear channels / TP's
http://www.lyngsat.com/amc3.html
Wyr