I have two transmitter nodes both running the same firmware, just that the transmitted packet is configured to have a different node ID (you can call MAC address) in it's packet.
I see that the operation works fine if only one node is switched on and the packets are received from that sender at the receiver at the desired rate (I transmit a packet every 100 ms). However when the other node is switched on, reception from one node is affected.
Does CC1120 have in built CSMA? Does the node delay it's broadcast if it detects another sender transmitting at the same frequency? Are there frequency channels available like WiFi? (2412 MHz, 2417, 2422, 2427 . . . )?