PixHawk 2.4.8,QGC, “Radio not ready”, “Please turn on Transmitter”

QGroundControl
1

I got the message like some others “Radio not ready”, “Please turn on Transmitter” when calibrating my transceiver

My RC transmitter is a Taranis X9lite using Open-TX vr 2.3.15-otx (1004ef7c)
Internal module ISRM-N 1.1.0/2.1.10FCC
The receiver is FrSky Archer R4 which is updated to the last firmware version v2.2.14 and is connected through the S-bus with the flight controller.

The receiver is registered and bound, so both are communicating

The flight controller hardware is a PixHawk 2.4.8 on 4F450 frame and got the firmware version updated to the latest PX4 version. I wanted ArduPilot but did not know which board I should select a question that was not asked selecting the PX4 firmware. I run the latest version of QGroundControl V4.4.3 under MacOS 15.3 on an M4-Pro installed using HomeBrew.
In QGC I:

  1. I updated the firmware to latest PX4 Stable Release v1.15.0
  2. Selected the correct airframe
  3. Calibrated all the sensors but got stuck at the calibration of the radio and continuously get the message: “Radio not ready”, “Please turn on Transmitter”

I searched the forum:

I ordered another model of receiver but it will takes weeks before I get that one and it is ulcer if this will help. I was wondering if anybody had any suggestion on what to do next. I’m an almost retired NOOB who just built this weekend his first quadcopter that has not flown yet. I’m new to all this and slowly start to get to grips with the complexity and all the new terms. So do not fear to explain it as I was 10 year old what I’m doing wrong. Highly appreciate in advance anybody willing to help. I see there are some diagnostic tools in QGC but I’m not sure how to use them so that might be a next step.

2

It sounds like you do not have the Receiver connected to the Pixhawk properly. The RC/SBUS input is on the FAR LEFT. The SBus OUTPUT is the next one over. Also make sure you have the ground (black) wire on top…

Form my experience, PX4 is not an optimal firmware for that flight controller. I have 2 of them and I have 2 older 2.4.6 Pixhawks. I tried using a 2.4.8 with PX4 as part of an SiYi long range video stem but the Pixhawk kept choking on the code. So I switched to an SiYi N7 FC (a Pixkawk 6C in disguise) and it works just fine. I am also in to process of upgraded a hexacopter from a 2.4.8 to a HolyBro Pixhawk 6X.

Arducopter is better suited for the FC you have.

20250219_193618
20250219_1936181920×1081 154 KB

3

I think you might be right judging from your picture. Thanks for your advice. Will check it next time I get home!

I tried to install the Arducopter but it asked questions I was unable to answer. With the PX4 install I had no such problem.
Will see if I can dig up the questions to share.

4

i have pixhawk 4 holybro i am trying to do the same in qgc but it looks like my pixhawk is not connected to the receiver - infact i have checked my receiver with another FC it is working and binded with transmitter
reciever–>flysky