The RK-3+ from Mini Circuits is a Frequency Multiplier with Input Frequency 0.05 to 150 MHz, Output Frequency 0.1 to 300 MHz, Input Power 0 to 13 dBm, Harmonics 16 to 40 dBc, Conversion Loss 11 to 17 dB. Tags: Plug in. More details for RK-3+ can be seen below.