Can't receive 433 Mhz signal

Dear all,

I have a problem with my Arduino Uno receiving the signal of a remote (433.92 Mhz) for radio control sockets.

I can receive the signal of the remote of the first set I bought with the code below. However, with my second set I do not receive any signal at all, even though the remote interacts correcly with the corresponding sockets.

I dismounted the remote and the used transmitter datasheet can be found here:
http://pdf1.alldatasheet.com/datasheet-pdf/view/591640/LUGUANG/HDR433M.html

Does anyone have an idea why I don’t receive the signal?

Thanks a lot!
Best,
Alex

#include <RCSwitch.h>

int dataPin=0; //Pin2
RCSwitch mySwitch = RCSwitch();

void setup() {
  Serial.begin(115200);
  mySwitch.enableReceive(dataPin);  // Pin 2!
}

void loop() {
    
    if (mySwitch.available()) {
    
    int value = mySwitch.getReceivedValue();  
    delay(500);
    if (value == 0) {
      Serial.print("Unbekannter Code");
    } else {
      //Serial.print("Empfangen ");
      Serial.println( mySwitch.getReceivedValue() );
      //Serial.print(" ");
      //Serial.print( mySwitch.getReceivedBitlength() );
      //Serial.print("bit ");
      //Serial.print(" Protokoll: ");
      //Serial.println( mySwitch.getReceivedProtocol() );
    }

    mySwitch.resetAvailable();
  }
}
}

The socket may use a data encoding protocol that is not compatible with the RCSwitch library.

Follow these instructions to verify transmissions and investigate the problem from the ground up.