Curiously, 430 kHz is also in the range which is considered to be ultrasound.
That frequency turns up as a signature of one form of LENR, according to recent revelations - and it would be a mistake to over-generalize from that alone; but . there are a number of principles of reciprocity which turn up in electromagnetism, so it is not at stretch to imagine that this frequency would be of interest when used as input. From: David Roberson Thinking of acoustics....If the hemispheres are very accurately machined then any ultrasonic excitement of the surface that is symmetrical will form waves that collide at the center of the device.
