The 8331-F1-XX-XX from Weinschel by Spectrum Control is a RF Variable Attenuator with Frequency DC to 3 GHz, Attenuation Range 63 dB, Power 1 W, Peak Power 46.99 dBm, Insertion Loss 4.5 dB. Tags: Rackmount, Programmable, Digital, USB Controlled, Computer Controlled, Multi-Channel. More details for 8331-F1-XX-XX can be seen below.