A bibliography at http://www.contesting.com/_rfi/9801/0010.html provides a wealth of info on locating power line interference and associated equipment. 73, Dave, K1FK Fort Kent, ME -- Submissions: rfi@contesting.com Administrative requests: rfi-REQUEST@contesting.com WWW: http://www.contesting.com/rfi-faq.html Questions: owner-rfi@contesting.com