The LCN is the Logical Channel Numbering ( I belive they call it that) When you got your freqs. they should be in a specific order. They MUST be programed in the order you recieved them. I checked Seminole Fl. I found Florida Power& Light. If you look at the EDACS freqs. they all have a small number in front of them01 937.97500 02 938.96250 03 938.97500 That is the order you program them called the LCN. Don't change them in numerical order.