Test Port Adapter Set, 3.5 mm (Test Port ) to Type-N The Agilent (now Keysight) 85130C are Test Port Adapters and designed to protect the test set port when it would be directly connected to the device under test. These adapters have a special rugged female connector designed for connecting to the network analyzer test port. This special connector will not mate with a standard male connector, but converts the rugged test set port to a connection that can be mated with the device under test. Frequency range: DC to 18 GHz Return loss: 28 dB or better Contains: 3.5 mm to type-N male adapter 3.5 mm to type-N female adapter