EFHW- End Fed Half Wave transformers
Ever since March 2015 when we started to market the High Ratio/Wideband transformers for EFHW antennas the work on R&D (Research & Development) never stopped. The number of limitations in the design of a 49-81:1 ratio of impedance transformation over a large HF frequency spectrum (1-30MHz) was challenging and final designs are always some sort of compromise. The market demands and drives the constant improvement of power handling, lower insertion loss, and better match to a single Half wave wire and its multiples. We reached some of the market demands and some of them are still limited by rules and mechanics of how these wideband/high ratio transformers operate.