Скачать или смотреть My DIY 4:1 Balun for Ladder Line

This is the 4:1 balun which I homebrewed just now for connecting between my recently homebrewed ladder line and a short piece of HLF 200 cable which goes to the ATU-100 automatic antenna tuner. My loop antenna which is almost a 40 m folded dipole, in combination with 10 m long ladder line and 183 cm of HLF 200 coaxial cable was very difficult to tune to 40 m amateur radio band. It could be tuned easily to 20 m and 10 m bands. Difficulty for tuning to 15 m band was in between. It would not tune to the WARC bands at all. My on air friends suggested using a 4:1 balun between the balanced ladder line and unbalanced coax to get a better match. Of course I have not measured the impedance of the ladder line and it is likely to be more than 200 ohms and may need a higher ratio balun. But for simplicity in my first attempt, I am planning to try out this 4:1 balun. Read More: https://johnsonfrancis.org/techworld/...