Ibuprom wrote: The link shows that you need to add a small capacitor and the noise disappears.
I found my module and checked it. Unfortunately, it helps as much as incense for a dead man (and I've tested with other capacities as well). This module is a failure.
But there they also wrote about adding an additional antenna - we will reduce direct interference, and the RF power necessary for proper communication will also decrease ... As I wrote - many times I found out that complaints about a "Chinese" for $ 2 are often justified, but also many inconveniences can be eliminated at low cost. Of course, if we expect hi-fi quality, why buy Chinese for $ 2? Many wifi modules in tablets on rtl8188, also used in internet radios, can work stably after improving the power supply and antenna. The same with ESP8266 - many complain that they hang up every few hours, and they use the Internet scheme. But when we "improve" it a bit, the modules can run for months without problems.
more than once I found out that complaints about a "Chinese" for $ 2 are often justified, but also many inconveniences can be eliminated at a low cost.
I understand these words and I have found out more than once. Even here Link , I mentioned this situation. However, since the pointless struggle with the XS3868 module, I prefer to use the VHM-314 module (already recommended here by me) without such ailments.