Cool-running power unit for all masthead pre-amplifiers. * 47-826MHz, insertion loss PROception F Type Masthead Amplifier Power Supply 1 Way. Fully-screened RF modules, compliant with EMC standards (BS EN 55013 & BS EN 50083-2 Low RF insertion loss and excellent 75 Ω impedance matching. Passes return path signals, allowing use in IR eye system Electronic long-term short-circuit protection with two-colour LED indication.