Originally Posted by Analoguesat  You could try another lnb and see if you can find a lower current draw device |
That's not an option. It's a flat antenna with a specially designed LNB, so there is only one kind of LNB for sale.
Note also that while turning the motor and connecting it to the LNB, the motor remains turning, which suggests that the card can supply enough power. But why it doesn’t do so from the start beats me.
It could be because of a significant voltage drop (which I haven’t tested), so that the motor can not start in the first place. A simple motor that starts makes an open circuit before creating enough backEMF (i.e. building up resistance).