I had several 7 year old Kidde wired smoke/CO detectors on two levels. I only run 100 watts, but occasionally triggered alarms on 160 meters where my vertical is only 30 feet from the house. I replaced all detectors with First Alert units which come with a 10 year back up battery. Never any trouble with the Kidde or First Alert units on 80-6 meters. I never installed any ferrite or ran a high power amp so no idea how they would respond to 1KW plus. The First Alert units do not have the voice warning, but give coded beeps for fire and CO. I tried one unit first, then since my old ones were 7 years old, just replaced them all. This is not a scientific test with a sample size of ONE. Just an idea to try, and my new units have only been installed less than 2 years. Good Luck. KL7CW
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