Transmission distance 433MHz RF?

Question

Arduino

Good evening.
Order transmitter and receiver 433 MHz RF. According to the description, the radius is about 10 meters + - it depends on the walls, etc.
I soldered the antennas, connected them to different raspberries, as a result, it turned out to transmit data by about 20 cm. Then the receiver does not receive anything.
I did it following the example https://magpi.raspberrypi.org/articles/build-433mh...
Antenna like this https://prom.ua/p514863414-peredatchik-besprovodno... ?

Why such a short communication distance? Maybe clumsily soldered the antennas, or do I need to do something else?
Thank you.

Answer 1

Anyone who will be interested.
I took another module, NRF24L01 + 2.4 GHz and everything works fine.

Answer 2

They say these are the cheapest and most fig (unstable, unreliable) transceiver modules on Ali.
Anything can happen with them, they can be badly tuned to each other, they can be unsoldered ...
Look , Alex has a catalog of proven components, as well as many articles and videos on how to use them.
The interference of the raspberry itself can also be affected.

Answer 3

That's how it should be with this junk, it's lucky that they turned on at all.