I decided to pick up one of those RCTimer APM boards a few weeks ago to help support free trade. This was before 3dR lowered the cost of the APM board. The kit complete comes with their clone of the APM, Radio Modem, and GPS. The kit arrived and I noticed many things are alike. Including the silk screening on the back of the radio modem that says "3d Robotics" that was covered up by the RCTimer sticker. Then again some items are different. One of which is the plug they give you for the radio modem.
3d Robotics provides the opposite plugging of what RCTimer provides here. This creates a slight problem if you don't have a cable to swap things around. Thinking about the issue I recalled seeing UART silk screened on the bottom of the board. Flipping it over I noticed that UART 0 is labeled on one side.
Sure enough it's labeled UART0 just like the 3dR port you'd normally plug a radio modem into. After moving the wires around in the plug decided to give it a whirl and it works.
Thinking about it I realized something. Does this mean I can plug my regular 3dR modem into the normal UART0/2 port.. Then plug the Mini mOSD into the UART0 TX port on the side? Many folks talk about making a Y-Cable to attach the Mini mOSD AND Telemetry modems. Seems like adding a pin header on the other side and attaching there is cleaner.