21. Variable capacitors are often used in reactance, e . g . for impedance matching in antenna tuners. 22. Impedance matching is neither necessary nor desirable.23. In terms of the reactance half-plane to the Smith chart used for impedance matching of transmission lines. 24. Most shortwave broadcasters have continued to use high-impedance feeds even before the advent of automatic impedance matching . 25. Owned by Dunlop, it produces what is known as " impedance matching of club and ball ." 26. Its use as a connector for composite video signals is extremely common, but provides poor impedance matching . 27. The transformation ratio is the ratio of the input and output impedances of the impedance matching network. 28. Impedance matching is not always necessary.29. The Impedance Matching Room has a matching transformer to perform impedance matching between the transmitter and the antenna. 30. Impedance matching , does it really matter?
