The ATC4B from Cobham Signal & Control Solutions is a RF Variable Attenuator with Frequency 4 to 6 GHz, Attenuation Range 15 dB, Attenuation Accuracy ± 0.5 to ± 1.0 dB, Power 1 W, Insertion Loss 3.2 dB. Tags: Module with Connectors, Programmable, Digital. More details for ATC4B can be seen below.