That would be "Intermittent Commercial and Amateur Service". 73 Bob, K4TAX On 5/4/2020 1:24 PM, Jim Brown wrote: > On 5/4/2020 6:53 AM, John Simmons wrote: >> Nowadays manufacturers use 'ICAS'. One even specs their amp for '100% >> duty cycle ICAS'. ICAS=Intermittent Continuous Amateur Service'. >> Gobbledegook! > >