The 651-038-020 from Broadwave Technologies is a RF Variable Attenuator with Frequency DC to 3 GHz, Attenuation Range 20 dB, Attenuation Step 1 dB, Attenuation Accuracy ±0.75 dB, Power 1 W. Tags: Module with Connectors, Programmable. More details for 651-038-020 can be seen below.