My recent researches into the BC-610 led me to the T-368, which was obviously meant to replace it. I downloaded the handbooks from BAMA but there doesn't seem to be any indication of where the design originated. Who built these things? It appears the T-368 was succeeded by the TMC GPT-750 series. -- Richard Knoppow Los Angeles WB6KBL dickburk at ix.netcom.com