I think it’s normal. I am using RP1 from radio master. Solder and hot glue, then insulated it with a shrink tube. It melted my hot glue. Nothing is wrong. Place on an airy part of drone. Don’t use any wire. Use wire with silicone wrapping only.
Turn off telemetry it be cool. Remember such a small PCB emitting 100mw it will heat up. Any Transmitter will heat up.
I believe the following factors contributed to the issue:
[1] Root Cause 1:
As geofrancis mentioned, the receiver is designed to operate on well-ventilated racing quads. However, I installed it in a ground station with a waterproof seal, which blocked airflow.
[2] Root Cause 2:
My operating area was in the South Pacific, where the temperature was too high. I placed the receiver in the shade, but it didn’t help.
[3] Root Cause 3:
I operated my aircraft in an environment with significant interference.(You wouldn’t be able to imagine where I flew the aircraft.) I suspect this caused the IC chip to overheat. The root cause is a combination of high ambient temperature, radio interference, and sealing the receiver.
[4] Solution:
I replaced the receiver from the R81 v2 to the H16, which solved the problem for me.
[5] My Opinion:
Some people mentioned wire resistance or soldering issues, but I’m not sure that’s the cause. I’ve done a lot of soldering and PCB work and never encountered this issue. While it might affect others, it doesn’t apply to me. Additionally, some said overheating isn’t a problem, but I disagree. Overheating can damage the receiver during operation, potentially leading to crash accidents because of this temperature issue. In fact, two of my receivers were damaged severly due to this overheating issue.
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Hello. The difference between your situation and mine:
[1] I had to install my receiver in a ground station, not on the aircraft.
[2] I operated the aircraft in one of the hottest places on Earth (near the equator). Even though I placed the receiver in the shade, I believe it didn’t help.
[3] I flew my aircraft in an area with a lot of interference.
These factors caused my receiver to overheat more than yours, which led to the problem.
For your reference, I used good quality silicone wire.
Some receiver does transmit telemetry. For example Radio master elrs receiver. When they transmit it will heat up the receiver a lot. Turning off could bring down the temperature. But I think since you said you put it in a waterproof seal, then likely it isn’t going to work much in a tropical region.
Thank you for your knowledge and help. I didn’t realize there was such a detailed aspect of the problem (turning off telemetry).
As I mentioned earlier, I have already switched my system to the H16. The original post was from April 17, which is quite some time ago (although Romi’s reply was recent). The situation has changed, and I no longer have access to the aircraft. Therefore, I can’t try your recommendation at this moment.
However, if I get a chance to try it later, I will definitely consider turning off telemetry.
I hadn’t heard about pixhawk telemetry and RC interference before. My interference was due to dense and professional industrial radio wave equipment.