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300 to 75 ohm converter
This circuit uses an EL2004 350MHz fet buffer to form a 300 ohm to 75 ohm impedance converter. The EL2004 provides power gain and isolation between source and load when used as an impedance matching device. In this circuit, there is no output matching pad between the 2004 and the 75 ohm line. Such matching is not needed when the distant end of the cable is properly terminated as there is no reflected signal to worry about and the 2004 isolates the source. This technique allows the full output voltage of the EL2004 to be applied to the load. V+ and V- can be up to +15v and -15v respectively.