The 1216B-4AC from ACST GmbH is a Frequency Multiplier with Input Frequency 13.75 to 21.25 GHz, Output Frequency 55 to 85 GHz, Input Power 0 to 5 dBm, Output Power 18 to 24 dBm, VSWR 1.80:1. Tags: Waveguide, Waveguide Multiplier. More details for 1216B-4AC can be seen below.