FT50-43 Toroid Ferrite Core OD = 0.5 in / 12.7 mm +/- 0.25 mm ID= 0.281 in / 7.15 mm +/- 0.20 mm Ht= 0.188 in / 4.9 mm +/- 0.25 mm AL=440 +/- 20 % uH=(AL*Turns2)/1000 Actual measured AL using 10 turns #28 wire Wideband Transformers 5 - 400 MHz Power Transformers 0.5 - 30 MHz RFI Suppression 5 - 500 MHz