Development/Description        (Source: Jane's Military Communications july 5 2005)
The solid-state 628T-3() HF receiver/transmitter is designed to conform with ARINC specifications 533A/559A/404A.Controlled by a remote radio set control, the transceiver provides 280,000 operating channels with 100 Hz spacing from 2 to 30 MHz. The 628T-3() processes voice and data signals in both SSB (upper and lower) and compatible AME, as well as CW in USB.The transceiver is packaged in an ARINC 404A ¾ ATR short case and replaces the 618T-3/3B/6/6B when fitted with a 999W-3/3A passive adaptor.