The 4226-63 from Weinschel by Spectrum Control is a RF Variable Attenuator with Frequency 800 MHz to 3 GHz, Attenuation Range 63 dB, Attenuation Step 1 dB, Power 50 W, Insertion Loss 4.75 dB. Tags: Benchtop, Programmable, Digital, USB Controlled, Computer Controlled. More details for 4226-63 can be seen below.