The original Ic-746 may be different, but I know that the 746PRO uses a standard Icom OPC-478. This serial cable works with their handheld transceivers. According to a message I received on the ic746 list, it will also work fine with the 746PRO if you Plug a Stereo to mono 1/8 inch adaptor on the end of it. The OPC-478 costs $34.95 plus shipping from Universal-radio. There are also OPC-478 compatible cables from the following sources: http://k1nu.home.comcast.net/~k1nu/k1nu/Products/control.html http://members.fortunecity.com/w2eny/single_civ/ Keith