I had a procedure done on my back earlier today. RF was used to disrupt a few pain-carrying nerves. Being the usual, curious ham I asked the frequency being used. I was told is was 1470 kHz. As I said above, interesting. Jim Weaver, K8JE, Director ARRL Great Lakes Division 5065 Bethany Rd. Mason, OH 45040; Tel. 513-459-1661 ARRL, The national association for Amateur Radio