Has anyone considered using a spread spectrum switching regulator controller to reduce the EMI effects? See the following links: http://www.eetasia.com/ARTICLES/2006OCT/PDF/EEOL_2006OCT09_EMD_RFD_TA.pdf?SOURCES=DOWNLOAD http://www.maxim-ic.com/appnotes.cfm/an_pk/1077 http://www.elecdesign.com/Articles/Index.cfm?AD=1&ArticleID=3577 Doug - W8NFT 1183059690.0