Spektrum SPMAR7200BX - Manual (Page 6)

EN
6
Servo Connections and Auxiliary Channels
Servo Selection
Select servos that are adequate for flybarless operation. The servos must have
high torque in addition to being fast and precise. Using high-quality servos that
are suited for flybarless helicopters increases the rotor blade options. A poor
servo-rotor blade combination will cause several issues including oscillations
in hover and unwanted reaction in fast forward flight. Connect all servos to the
AR7200BX. Refer to the diagram below for your particular helicopter’s cyclic
servos. Connect the pitch (PIT) servo to AUX1 on the AR7200BX.
Auxiliary Channel
While the AR7200BX is a 7-channel receiver, Aux 3 is additionally offered for
more channel functions. The Gear channel is internal to the receiver used for
tail gain.
preparing the Transmitter for Flybarless operation
1. Create a new model in your transmitter’s model memory.
2. Be sure all trims/sub-trims are disabled (zeroed) and all servo travel values
are 100%.
3. Set your transmitter’s swash type to mechanical mixing (1 servo 90° mixing).
Never enable your transmitter’s eCCPM or revo-mixing functions. This is
handled by the AR7200BX.
4. Do not adjust the pitch curve at this time. During setup, the pitch curve must
be linear from -100% to +100% (or 0% to 100% depending on radio brand).
5. Again, make sure that there are no mixing functions active (for example
revo-mixing).
Receiver Installation
Attach the AR7200BX receiver using one of the provided gyropads. The
AR7200BX must be in a low vibration position, such as the receiver or gyro
platform. The mounting platform must be perpendicular to the main shaft.
Helicopters usually have enough room on the frame to separate the main feeder
antenna and the optional remote receiver. If necessary, make a mount using clear
plastic to attach the remote receiver.
120° 140°
Flight Direction
90°
mechanical
mixer
AIL AIL
AIL AIL
ELE ELE ELE ELE
PIT
PIT
PIT PIT
Electronic mixer