The 8310-38-F-E from Weinschel by Spectrum Control is a RF Variable Attenuator with Frequency DC to 3 GHz, Attenuation Range 63 dB, Attenuation Step 1 dB, Power 50 W, Insertion Loss 5.25 dB. Tags: Benchtop, Rackmount, Programmable, Digital, Computer Controlled. More details for 8310-38-F-E can be seen below.