Frequency Range :0.01-18GHz, Excess Noise Ratio Range :14-16dB, SWR :0.01-0.03 <1.3:1 (Rho 0.13),0.03-5.0 <1.15:1 (Rho 0.07),5.0-18.0 <1.25:1 (Rhp 0.11) Impedance :50 ohm,Max Reverse Power :1Watt Power required :28+-1V(60mA peak,30mA average for source ON)