Finally you can fix your bad HC-12 clones that has no range!
Turns out, it was only an error on the PCB that you can fix with some solder.

After fixing several of them we did a range test, and it works!!

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A lot of bad copy hc-12 can be found on ebay, aliexpress and other places. They usually have the si4463 transceiver from silicone labs. The module is really good, there is just a PCB design fault.

With this easy fix you can get full range with the clones as well.

00:00 Intro
00:20 Original vs. clone
01:22 The fix (repair)
02:46 The repair is done
03:12 Indoor test
03:36 Range test