The last days I was plagued with Dump1090 crashed.
Of course I had the power supply under suspicion and replaced it but it did not fix the problem.
My cheap USB power meter showed me voltages of around 4.6V-4.7V measured at the PI.
This made me think that the micro usb cable could be the source although the cable in use was bought as a cable with low-resistance and of high quality (Yes! Marketing blabla).
This evening I did test at least 8 cables with the Rui Deng UM25C meter and LD25 load. With this combination there is a procedure to determine the resistance of a cable under load.
I did test with a load of about 1000 mAh and to my surprise (or maybe not); the “good” cable had a relative high resistance confirming a voltage drop from 5.2V at the power supply to 4.6V at the micro usb side. In fact most of the cables were crap except one.
I found an unbranded cable, I even don’t know where I did get it from, that performed actually quite good; at the micro usb side I still measured 5.0V.
- Use short micro usb cables
- High quality claims are not always true
- Measure the cable yourself