The RPM-1 is the 500 ohm Indicator potentiometer for all T2X, HAM-IV, HAM-V and CD-45II rotors.
The RPM-1 is the 500 ohm Indicator potentiometer for all T2X, HAM-II, HAM-III, HAM-IV, HAM-V and CD-45II High-gain rotators. It has a silver plated contact point that makes for smooth traveling, longer lasting and more reliable contact between the pot strip and wiper arm.