EFHW End Fed Half Wave Antenna Higher Power Using 52 Mix Ferrite

This is for 80 - 10 only. 160 requires a 3:21 ratio, 43 mix and 200 pf capacitor. After months of research I found a way to make the transformer handle high power. I can now run 500 watts + on 80 meters using CW. CW has a much higher duty cycle than SSB. 40% vs 25%. I am using 2 primary turns and 13 secondary turns for 80-10 coverage. Update: 10/12/2019 We now use 14 turns total. We are also using 12 AWG enameled wire for this 3 core transformer. It's harder to work with but results in better SWR and power handling especially on 80 meters when running high duty cycle mode.