The amateur radio community (ham radio) tends to spread misinformation about 1:1 BALUN, also known as Common Mode Choke, RF Line Isolator, etc. Although they are all the same device comprised of ferrite material core(s) and mostly 50 Ohms coaxial cable, the design, material, size, etc plays a major role
PROBA
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.
