as in many rigs, an external amp relay is reccommended.. the older rigs, ah fond memories of my ts-520/ts-830/ts-850 had heavy duty relays, but the newer ones, have very light sensitative tiny contacts that WELD together in a blink of an eye. I know this to be true as I almost fried mine in my less than 24 hour old ic-756 pro 2. gl es 73. larry..N2LH