Engineers of LDG Mini -Notebook Tuning Range

摘要

Any way you look at an LDG tuner, it functions as a variable impedance transformer. No matter where you place it in the feedline, it's just like a balun, unun or any other matching transformer device. Way back in 1944, Phillip H. Smith (of Smith-Chart fame) wrote about the eight ways to configure an L-type matching circuit for transmitters using one inductor and one capacitor. Smith wrote in Electronics for Engineers: One of the simplest and most effective impedance transforming networks for RF applications is the half-section L-type circuit. Those circuits, with the aid of microprocessors and software control, have been whittled down over the years to the standard LDG "Switched-L Network".