Brady O'Brien KC9TPA is a young ham who has been working with David Rowe VK5DGR, the creator of the open source CODEC2 low bitrate voice codec. In this TAPR presentation he talks modem tech in SDR. Then Bruce Perens K6BP ... Do we really need to say any more? OK, Bruce's main point is one he's been making for several years: The major manufacturers have been screwing up Digital Voice with mediocre implementation and their incompatible walled gardens. And we're slowly getting closer to VHF+SDR radios that can do better. He is especially critical of Yaesu, but actually compliments Kenwood for introducing a radio that is actually compatible with at least one other line of radios (ICOM/D-STAR).