I was able to setup gazell frequency hopping communication between a device and a host. Device:nrf51822+PA/LNA(RFX2401);Host:nrf51822+PA/LNA; They can communicate at a long distance about 300m+. In order to simplify the design and lower the cost, I want remove the PA/LNA of Host, In this condition, when they communicate at a long distance , Host may receive the data sent from Device, but Device can't receive the ACK sent from Host, because there is no PA on Host. In this condition, Can they keep communicate and frequency hopping? Ps: The data Device send to Host is useful, I don't care ACK.