Review on 🔒 Enhanced HiLetgo 433M Transmitter + Receiver Kit: High-Frequency Super Regenerative Transceiver Module for Advanced Burglar Alarm Systems by Tom Podolski

To test them I ran a simple Arduino program that sends and receives messages. The good news is that they all "worked" and arrived very quickly. :one. They come with NULL documentation. Not even a pinout diagram! I had to search the net to find it. This is totally unacceptable.2. I found that the TX block could handle VCC up to 10.25V (again no documentation!) With VCC @ 5V the range was about 2ft. With VCC @ 9.5V the range was 6ft and depended on the orientation of the antenna. Almost useless.3. There is a tuning choke on the RX, but there doesn't seem to be a received signal strength indicator (RSSI). The best I could do was put an oscilloscope on the TX and RX boards, run the digital signal input on the TX board and watch the demodulated data on the RX. By adjusting the inductance I was able to adjust the signal strength. As mentioned in other reviews, the assembly technique is terrible. Consistently cold solder joints. All in all you get what you pay for. Don't worry about that.