The three columns in the list mean nothing. They were likely a cut and paste from somewhere else when the page was constructed. All of the transmitters listed are inter-compatible with the trainer system. Some will use the micro-connectorthe ones with the small "(2)". All others use the round plug. The 8FG and 12FG require a special trainer cord if they are being used with one of the transmitters in the list.

Finally, some transmitters must have a PPM signal to them, and they are also listed in the text.