The RKK-4-252+ from Mini Circuits is a Frequency Multiplier with Input Frequency 430 to 630 MHz, Output Frequency 1.72 to 2.52 GHz, Input Power 16 to 19 dBm, Harmonics 30 to 32 dBc, Conversion Loss 25 to 30 dB. Tags: Surface Mount. More details for RKK-4-252+ can be seen below.