How to radio set up on the snapdragon board with QGC?

hello, all

I have R6D receiver and AT9 transmitter. Binding R6D receiver and AT9 transmitter And I connected R6D receiver to J15 connector on the board. I sent the signal with AT9 transmitter
but the radio calibrate of QGC didn’t work. I got a message saying “Detected 0 radio channels. To operate PX4, you need at least 5 channels”.
R6D receiver has 6 channels and it supports PWM and PPM. But QGC didn’t detect the signal from R6D signal. And I can select only DSMX8 at spectrum Bind of QGC. How to select another communication protocol?

Thanks, bye