# The Spektrum Cannot be binded, and QGroundcontrol “Detected 0 radio channels. To operate PX4 you need at least 5 channels”

Source: https://forum.modalai.com/topic/388/the-spektrum-cannot-be-binded-and-qgroundcontrol-detected-0-radio-channels-to-operate-px4-you-need-at-least-5-channels
Category: General Questions (https://forum.modalai.com/category/2/general-questions)
Posted: 2021-08-11 02:55:36 UTC by DarkKnightCH
Replies: 9 · Views: 2075

## DarkKnightCH · 2021-08-11 02:55:36 UTC

Hello,I am using a Spektrum DX6i(the Modulation is DSM2, and there are 6 channels ),  After configuring the IP address in the conf file and connecting to the m500 over QGroundControl, the QGroundcontrol says “Detected 0 radio channels. To operate PX4 you need at least 5 channels”. Does anyone know anything about this issue?

## Reply by modaltb (ModalAI staff) · 2021-08-11 03:06:36 UTC

Sounds like you have the MAVLink over IP connection working from VOXL to GGC.

The RC radio is a different 'band', some info here: https://docs.modalai.com/flight-core-radios/

Basically you'll want to have a joystick transmitter and you 'bind' it (e.g. pair) together and can use it for RC control (manual flying, testing, etc.)

## Reply by DarkKnightCH · 2021-08-11 03:25:33 UTC

Yes. You are right. There is connection between the VOXL and QGroundControl, Since in my QGroundControl I can see some IMU data of my quadcopter. But I also want to bind the spektrum RC radio transimitter and spektrum receiver, so I follow those step(RC radio setup) in [your official website](https://docs.modalai.com/voxl-m500-getting-started/).!

![RC radio.png](https://forum.modalai.com/assets/uploads/files/1628652136501-rc-radio.png) 

I tried to click the spektrum Bind and the QGroundControl will say "Detected 0 radio channels. To operate PX4 you need at least 5 channels", so what should I do to bind my spektrum RC radio transimitter and spektrum receiver?

## Reply by modaltb (ModalAI staff) · 2021-08-11 14:10:34 UTC (in reply to DarkKnightCH)

@DarkKnightCH ,

Can you look at the receiver after pressing the button?  Does it begin to flash an orange LED quickly?

## Reply by modaltb (ModalAI staff) · 2021-08-11 14:15:38 UTC

Also, what transmitter make and model are you using?

## Reply by DarkKnightCH · 2021-08-12 04:22:24 UTC (in reply to modaltb)

@modaltb Sorry, I made a mistake. You are right, once I press the 'spektrum bind' button, the orange LED on receiver starts to flash. This actually means my receiver is already in the binding mode. But when I click the 'calibrate' button, the Qgroundcontrol will say “Detected 0 radio channels. To operate PX4 you need at least 5 channels”. The transmitter that I am using is Spektrum DX6i, do I need to setup something in my transmitter?

## Reply by modaltb (ModalAI staff) · 2021-08-12 13:27:45 UTC (in reply to DarkKnightCH)

@DarkKnightCH 
I normally see this if I don’t reset the PX4 FW after binding.  Did you try to power cycle the vehicle?

## Reply by modaltb (ModalAI staff) · 2021-08-12 16:09:33 UTC

Also yes there's a binding procedure to connect the transmitter to the receiver.  Normally you have to hold a button down whilst powering on the transmitter until you hear a beep or see the receiver go solid.

## Reply by DarkKnightCH · 2021-08-16 14:44:23 UTC (in reply to modaltb)

@modaltb Thank you so much. I followed your instruction and then reboot the quadcopter, then it works. But there is a new issue: When I calibrate the radio, the radio channels for roll, yaw and throttle looks good, but for pitch angle, it shows 'not mapped'. I checked Qgroundcontrol: 'Vehicle Setup->Parameter->Radio Calibration', RC_MAP_ROLL is channel1, the RC_MAP_PITCH is channel2,  RC_MAP_THROTTLE is channel3 and  RC_MAP_YAW is channel4. 

Do you know what's wrong about the pitch radio channel mapping?

## Reply by modaltb (ModalAI staff) · 2021-08-16 16:57:34 UTC

Hi @DarkKnightCH ,

It's likely something you can setup in your transmitter, or perhaps reset the transmitter to default state.  What make and model do you have?