The V-4X from Spacek Labs is a Frequency Multiplier with Input Frequency 12.5 to 18.75 GHz, Output Frequency 50 to 75 GHz, Input Power 18 dBm, Conversion Loss 22 dB, Frequnecy 12.5 to 18.75 GHz. Tags: Passive. More details for V-4X can be seen below.