In Practice

摘要

RF power attenuators I want to make an attenuator to reduce the 100W output of my transceiver down to 10W. How do I calculate the resistances needed, and where can I find RF power resistors in those values? The calculation isn't difficult, but it is tedious, so let's skip the formulae [1 ] and go straight to a computer program. G4PMK's useful BASIC program called ATT was first mentioned in the July 2000 column, which also included some pre-calculated tables of typical resistor values. However, to design practical RF power attenuators you're going to need the program itself, for reasons that will soon become clear. Since modern versions of Windows no longer have a BASIC interpreter, I've now provided a ready-to-run program on the 'In Practice' website (see WWW.).