The RK-5 from Mini Circuits is a Frequency Doubler with Input Frequnecy 10 to 800 MHz, Output Frequency 20 to 1600 MHz, Input Power 10 to 20 dBm, Conversion Loss 12.5 dB, Harmonics -20 dBc. Tags: Plug In, Frequency Doubler. More details for RK-5 can be seen below.