G'day Michael, This is an exciting project and I'll look forward to seeing how it develops. I presume you already know about and have had a look at the GB7WE Dual Mode D-STAR / FM homebrew 2m repeater and the GB7WB homebrew 70cm D-STAR repeater. If not there are some details at: www.gb3wb.com Cheers, Davidt, VK3UR