Send it back under manufacture warranty. I dont hear that with my MP, waterfall sound or any other hiss type noise except for the normal band noise which my Icom 775 has too. Dale J. -- FAQ on WWW: http://www.qsl.net/k7on/yaesu.html Submissions: yaesu@contesting.com Administrative requests: yaesu-REQUEST@contesting.com Problems: owner-yaesu@contesting.com Search: http://www.contesting.com/km9p/search.htm