I tried to do wifi communication as follow site.
I did it. But I have a problem. I used 3 types of modules. (Attached)
A - NRF24L01+PA+LNA with Antenna
B - Black one (No antenna)
C - Green one (No antenna)
When I use A as Tx and B as Rx, It is working. When I use all other combination(B as Tx and A as Rx,C-A, A-B,B-B,…), it did not work.
What is the wrong.