The RKK-4-23+ from Mini Circuits is a Frequency Multiplier with Input Frequency 320 to 500 MHz, Output Frequency 1.28 to 2 GHz, Input Power 11 to 15 dBm, Harmonics 27 to 38 dBc, Conversion Loss 24.5 to 30 dB. Tags: Surface Mount. More details for RKK-4-23+ can be seen below.