In a message dated 05/14/2005 10:51:32 AM Eastern Daylight Time, cph1776 at yahoo.com writes: > I haven't noticed that too much with trucks, but > I have noticed it when driving by, and riding on, > certain city buses. On AM you'll pick up engine whine, > and other functions such as turn signals, etc. Flourescent lighting. It's the HV convertors. Willie...