Byonics provides a Bluetooth add-on for the Tinytrak 4. While I love the TT4 I am not a huge fan of their TT4BT Bluetooth solution. It consists of a board with 2 DB9, no case nothing to protect and makes the whole thing clunky and bulky. Almost 4 years ago I came up with my own more slick and integrated solution and have been happy with it since then.
After a couple of frustrations (here and here) I have finally managed to get my TYT TH-9000D running quite well with my Tinytrak 4. After a few weeks using it I must say I am quite pleased with the result, the TH-9000D is sensitive and there are not many APRS frames I miss from the nearby digipeaters. I run it on low power (10W) which is plenty enough. So here it is finally, what should have been a quite straight forward mod from the beginning.