Agilent/HP / Step Attenuator / 8494G Programmable dc to 4GHz 0 to 11dB / 1dB Step Insertion loss 0.6dB + 0.09dB/GHz Maximum SWR 1.5 (1.5 to 8GHz, 1.6 to 12.4GHz, 1.9 to 18GHz)