5 Watt Element for Wattmeter BIRD 43 in 200 to 500 MHz. Standard Elements All Plug-In Elements are calibrated in accordance with meticulous Bird calibration procedures supported by a long history of mean deviation values to assure adherence to advertised specifications of current instruments, as well as field interchangeability with equipment purchased, used and trusted in all the years since its introduction. Model Number Frequency Range (MHz) Power 50H 2-30 50 W 100H 2-30 100 W 250H 2-30 250 W 500H 2-30 500 W 1000H 2-30 1000 W 2500H 2-30 2500 W 5000H 2-30 5000 W 5A 25-60 5 W 10A 25-60 10 W 25A 25-60 25 W 50A 25-60 50 W 100A 25-60 100 W 250A 25-60 250 W 500A 25-60 500 W 1000A 25-60 1000 W 5B 50-125 5 W 10B 50-125 10 W 25B 50-125 25 W 50B 50-125 50 W 100B 50-125 100 W 250B 50-125 250 W 500B 50-125 500 W 1000B 50-125 1000 W
