I experianced a lot of problems with the SG2100 positioner not responding after turning to a couple of different satellites. Had this problem with two separate Twinhan PCI cards in separate rooms and also with a Stab HH90 positioner.
So I decide to perform a modification to the SG2100 and supply the power for the motor externally. I hope this modification will show if the problem is a weak power supply on the twinhan cards (Which is what I suspected from my reading on other forums). After the modification, the Positioner operates much better with the power now coming from a separate 12v nonregulated 500ma power supply (puts out 16.5 volts with motor running). I suspect that there is some voltage drop to the motor when power is supplied by the foil on the curcuit board. After reinstalling the motor and programing the satellite positions this weekend all apears well. The positioner never once failed to respond.
So I decide to perform a modification to the SG2100 and supply the power for the motor externally. I hope this modification will show if the problem is a weak power supply on the twinhan cards (Which is what I suspected from my reading on other forums). After the modification, the Positioner operates much better with the power now coming from a separate 12v nonregulated 500ma power supply (puts out 16.5 volts with motor running). I suspect that there is some voltage drop to the motor when power is supplied by the foil on the curcuit board. After reinstalling the motor and programing the satellite positions this weekend all apears well. The positioner never once failed to respond.