I soldered an antenna (quarter wave 17.3cm) on the transmitter and the receiver I plugged the receiver into an oscilloscope to about 3 meters from the transmitter when I issue a 1 Continuous I have a random square wave when I emit a continuous 0, I also have a random square wave but looks BE usually has 0 when I RS232 outputs a frame, once on 20, I see my frame.
A colleague bought the same but on Ebay and it has the same problem.
The modules will end in a corner because it does not really work
