Hi. Thank you all for advice. I have tried ceramic caps on small 24l01 but no success. I have not tried battery supply yet, but I will when time allows it. I installed 1.4.1 version, but did not see any difference... I continue to use NRF24L01+PA+LNA. Will change to small 24L01 when I achieve success. For my bench supply I use old PC ATX supply unit. I use 12V. Both Mysensor-units get voltage from 12V to their RAW pin. 12V also goes to my KIS-3R33S modules and 3V3 afterwards via 47uF elco to NRF. In both sketches I use delay(1000) as the first command for the NRF power supply to settle(?!?) then I use gw.begin... There is something new. If my hand is close to antenna of button/relay-sketch-unit (10cm or closer), the TX/RX is better (i.e. working). No difference if I touch gateway unit. Any idea? Maybe the whole problem is interference... ADDED: I have tried battery supply. Instead of 12V from old ATX PC supply I have tried 9V battery. There is no difference. Amplified NRF communication is 100% if both LNA units are used. If I mix them, or use only small 24L01+ all I get is "fail". Rok