The 75PA-053 from JFW Industries is a RF Variable Attenuator with Frequency 450 MHz to 2.15 GHz, Attenuation Range 127 dB, Attenuation Accuracy 0.4 dB, Power 0.1 to 1 W, Insertion Loss 4.7 dB. Tags: Rackmount, Programmable, Multi-Channel, System, Digital, Computer Controlled. More details for 75PA-053 can be seen below.