Samples do not work

[pneumus]

I uploaded the sender and the receiver demo code,

In the sender serial monitor I see this:
WriteData.........87
WriteData.........149
WriteData.........230
WriteData.........41
WriteData.........12
WriteData.........113
WriteData.........2
WriteData.........30
WriteData.........139

In the receiver serial monitor I see nothing. :- (
Note: I use the modules without external antenna.
If the module pins touch anything, the receiver monitor will flood like this:

ReadData.........255
ReadData.........255
ReadData.........255