On 4/10/07, David VanHorn wrote: > > I had found some of the papers referenced, but not that page. > > In the end though, too much information. I need something I can give > to a crystal vendor to say "has to withstand this". The baseball vs > bat thing is an approximation anyway, so it's closer to an "order of > magnitude" answer that I'm looking for. I wonder what the FoxTrax used? http://en.wikipedia.org/wiki/FoxTrax http://csdl2.computer.org/comp/mags/cg/1997/02/g2006.pdf Not sure if it had a microcontroller on board, but it had IR emitters, so I assume there was some kind of modulation used. PS. Go Canucks! :-D -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist