A friend did some work for an importer and has been given couple of Ninco Air gliders which are supposed to RTF but radios are not binded to the Rx units.

He passed the whole set to me and I am trying to get them up and running. I am stuck at binding the radios. How do I bind the transmitter to the Rx unit. By looking at it, Rx has 6 channels while Tx has 4 which is what website also suggests. But how do I go about binding the radio?

Ther is one button labelled PDM on the radio and there is one button on the Rx unit.

Thanks