HC-12 error correction

[iw2fvo]

Good day,
I received the module this morning.
I wrote a simple program just to test the operative range of those modules.
I checked one way transmission only : tx is located in my home basement and the receiver is outside near the entrance gate.
The distance is few meter less than 50 with this set_up.
I used the default setting: 9600 8 n 1 and FU_3 mode. Power supply for the tx is around 3v3 and 4v0 for the receiver.
Two " rubber" antennas is used.
Sine I would like to test the Max communication range, I am asking if is there avaialable a " dedicated " tx pattern of data or text to be used for .
The gap or the repetion rate is interesting too.
The output from my set_up is attached here togethre with the relevant picbasic program used.
Thanks
Ambro