Spektrum SPMMSJR9 - Manual (Page 11)

Spektrum Air Module 11
The Module system is compatible with all Spektrum DSM2 receivers that
includes the AR7000 and AR9000 full-range receivers as well as the
AR6100 parkflyer receiver.
Note: An optional Flight Log RF data recorder is available only for the
AR9000 receiver. The Flight Log records RF link flight data and displays
this information onscreen, allowing you to evaluate the RF link performance
of each individual receiver. See page 26 for more details about the optional
Flight Log RF data recorder fo the AR9000 receiver.
Installing the Receiver
Installing the AR7000
The AR7000 incorporates dual receivers, offering the security of dual path RF
redundancy. An internal receiver is located on the main PC board, while a second
remote receiver is attached to the main board with an extension. By locating these
receivers in slightly different locations in the aircraft, each receiver is exposed to its
own RF environment, greatly improving path diversity (the ability of the receiver to
see the signal in all conditions).