The 11605A Flexible Arm mounts on the front of the 8743B Reflection/Transmission Test Unit and connects to the device under test. Rotary air-lines and rotary joints connect to any two-port geometry. The unit is primarily intended for use with existing 8743As but can be used with 8743B. The unit covers the frequency range of dc to 12.4GHz and has an impedance of 50-ohms nominal.Option 018 = Frequency Range: 2 to 18GHz