Red Wine/SASless,
My understanding is that the current generation of ELB's use 406 + 121.5: 406 will get the Sat positioning (enhanced if GPS is input'd to the ELB), and 121.5 is transmitted for homer ops. None of the units that I operate with have 243.0 any more, but all have 406/121.5, and all are current (2008/2009) models.