... RF are working. LED5, LED6, LED7, LED8 are all on and AV1, AV2, AV3, AV4 are then ready to ... work.LED8 is on when no signal.--Select the channel: RX1 for RF1 and RX2 ... connect the antennas, and then apply the power--Switch on the power button--Set RX1,RX2,RX3,RX4 to the ... for RF3,LED8 for RF4. The LED will be on when the strongest signal is confirmed. It will automatically ...