The 4428D-28 from ARRA Inc. is a Mechanical Phase Shifter with Frequency DC to 4 GHz, Phase Shift 225 Degrees/GHz, 360 Degrees/1.6 GHz, Phase Adjustment 225 Degrees/GHz, 360 Degrees/1.6 GHz, Power W 100 W, Power 50 dBm. Tags: Module with Connector. More details for 4428D-28 can be seen below.