The 4428C-28 from ARRA Inc. is a Mechanical Phase Shifter with Frequency DC to 4 GHz, Phase Shift 180 Degrees/GHz, 360 Degrees/2 GHz, Phase Adjustment 180 Degrees/GHz, 360 Degrees/2 GHz, Power W 100 W, Power 50 dBm. Tags: Module with Connector. More details for 4428C-28 can be seen below.