Each repeater should be programmed in its own zone (group of channels).

Each TG (505, 380x, etc) should be programmed in its own channel in that zone.

Each channel must have its own receive group Рthis must contain ONLY the TG for the channel.  

Having multiple TGs in the receive group can cause some (Chinese) radios to jump TGs, creating chaos on the network.

“Promiscuous” mode should NOT be used.