The 8311-202-3-F from Weinschel by Spectrum Control is a RF Variable Attenuator with Frequency DC to 18.0 GHz, Attenuation Range 121 dB, Attenuation Step 1 dB, Power 50 W, Insertion Loss 5.25 dB. Tags: Benchtop, Rackmount, Programmable, Digital, Computer Controlled. More details for 8311-202-3-F can be seen below.