標準號：IS 8201-1976
發布日期：1977/1/1 12:00:00
實施日期：1999/12/31 12:00:00
適用范圍：1.1 This standard lays down the methods of tests and general requirements applicable to high frequency ( hf) wideband impedance matching transformers ( baluns) used for balanced to unbalanced coupling and impedance transformation, in electronic and telecommunication equipment.1.1.1 The transformers covered are meant for operation over frequency range 1·5 to 30 MHz having unbalanced impedances between 50 and 75 ohms or balanced impedances between 50 and 600 ohms.1.2 The matching transformers covered include:a) high power matching transformers for transmitting systems for matching balanced or unbalanced feeder sources and loads over a wide range of impedance ratios, andb) low power matching transformers for receiving systems for matching balanced antenna and unbalanced transmission lines over a wide range of impedance ratios.