As I have investigated the problem ( senao NMP-8602 + RB ) the conclusion is :
1. The NMP-8602 has really bad shaped smps build in wich is not stable at any change of the current load !
2. On the other side RB is in panic in cause of the pulses ower the power line comming due to NO.1
3. Result : you allready have seen it by your self!
4. The solution - change the card ! ( CM9 - best results )
P.S. Do not even think that because of te few dB more the card NMP-8602 is better . Wrong . better get a hi gain antenna or an amp and always calculate the ERIP so you can stay legal