There have been some issues with some non-Futaba receivers not working well with synthesized Futaba transmitters. Where the transmitter allows, changing to a fixed-frequency module solved the difficulty. With the 12Z and 14MZ, that's not possible. To insure bets possible operation, use a Futaba receiver with your Futaba transmitters. Futaba cannot assure that non-Futaba equipment is fully-compatible with other items of Futaba equipment. Futaba can only guarantee that Futaba components will work together without difficulties.