The TZ-1820-SL is a high power 1:1 50 ohm Balun designed to operate from 1.8 MHz to 20 MHz, covering the 160m through to 15m bands in a single balun. The balun uses a linear ferrite core with tri-filier winding for high efficiency and power rating. High temperature enameled copper wire is used to ensure the balun does not fail under extreme temperature, power and high VSWR conditions.