>Would it not be 300hz/360hz because lights are wired to different >phases of the 3 phase distribution system? >de john - KA5NQK John You are right. The 100/120 Hz and the 300/360 Hz composants are present with about the same level. The K3PGP RX has a very best response at 100/120 Hz so theses frequencies choice seems better. Yves F1AVY