Transmitter Connection Issue?

Technical Support (Official)
1

My students are having trouble connecting the transmitter to the receiver,. They have followed the steps in the guide for binding (so I believe), but when they try to configure the radio in QGroundControl, they receive an error message stating Radio Not Ready. Please turn on transmitter. The transmitter and receiver are on and bound. There is a solid light on the receiver, and I am unable to turn off the remote until I power off the receiver.

Attached are some pictures of the remote, receiver and QGroundControl.

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2

Can you confirm that you set your TX output mode to PPM and SBUS?

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3

Yes, sorry I accidentally deleted that picture from the original.

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4

Can you go to the summary screen and share what PX4 version you’re running? Sorry for all the questions. Just trying to get my head around this as I’m at a bit of a loss right now!

5

Here is what I could find. Let me know if you were looking for something different. I also took a pic of a few other things that may help.

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6

I took a Pix Hawk 6C from another drone and attached it. I ran the update of the firmware and it seems to work, so it appears that it is an issue with the Pix Hawk. It recognizes the controls from the transmitter when we connect. We are going to recalibrate everything and continue on and see if we have any further issues.

I also set the PixHawk back to a standard configuration and then reinstalled the px4_fum-v6c_default.v1.13.0.f7c457e.px4 firmware, but it still gave us the same error.

If you want to continue working on this issue, we would be happy to try anything that you suggest. If not, is there a way to get a replacement so I can return the Pix Hawk to the other drone?

7

Thanks for the info and glad you got it sorted. Any chance you can take a look at the physical pins of that port on your bad Pixhawk 6C? Sometimes a pin accidentally get bent. It’s a lot less common with the JST-GH connectors (on the 6C) but worth a look. Here’s one of mine that look good:

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If that doesn’t address it then we can open a ticket with the AVR team and see what can be done.

8

Here is a picture of the PPM/SBUS RC pins. Everything looks straight to me. The connector pops in smoothly and snaps into place with no issues.

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9

We are having the same problem as this team is having. We do not have another Pixhawk 6 to try. We checked Tx setting on the transmitter and the pins for the JST connector ana All are good. What should we do to solve this problem.

10

Will you please update to PX4 1.16 and give a the transmitter a try. When you do the firmware update it will prompt you to install the stable release (which is PX4 1.16) as today (10/2/2025). Details on the firmware update process in case you need it: