trying to send data to arduino rx by rf modul 434A without success

Using Arduino Microcontrollers
1

Hello every one,

i am sending data 8 bit to my arduino and i want my data to get into the rx ( by rf module 434A receiver).

So, i tried to send data but he always gets the data as "-1" .

i did a check by shorting the rx and the tx of the arduino to where is the problem but it works ( the data from the tx of the arduino gets into the rx of the arduino pretty good)',

i also checked my transmitter and my receiver they works good too ,

anybody thinks he knows where the problem can come from?

here is my simple code:

void setup() {
Serial.begin(9600);

}

void loop() {
Serial.write(255);
delay(100);
int x=Serial.read();
Serial.print(x);
delay(100);

}

thanks alot,

gidi