Spektrum SPMMSJR9 - Manual (Page 22)

Spektrum Air Module 
Futaba’s 12MZ and 14MZ transmitters utilize a unique module design. While
most 72MHz modules contain the complete RF electronics section that embeds
the encoded PPM signal from the transmitter into the carrier signal, Futaba MZ
modules operate using a different method. With the 12 and 14MZ transmitters, the
PPM signal is actually applied to the carrier signal within the transmitter, not in
the module. Note that the MZ 2.4GHz Spektrum module has an external connector
attached that must be plugged into the DSC port in the back of the transmitter. The
Spektrum module then captures the PPM stream through this DSC port.
Note: During operation the Futaba Logo at the top of the transmitter will
flash. This is normal and occurs because the transmitter recognizes the
module in use is not a Futaba brand module.
Note: Futaba’s MZ transmitter outputs eight-PPM channels. Consequently
the MZ module is an eight-channel system.
FZ Spektrum Module Instructions
Install the Spektrum module in the back of the transmitter and plug the connector
in the DSC port.
Futaba FZ Module Special Instructions