Spektrum SPMAR636 User Guide User Manual
Page 8

EN
8
Important: Y-Harnesses and Servo Extensions
When using a Y-harness or servo extensions in your installation, it’s important 
to use standard, non-amplified Y-harnesses and servo extensions. Amplified 
Y-harnesses and servo extensions will cause the servos to operate erratically or 
not function at all. 
Setting the Failsafe Positions
The Receiver features two types of failsafe: SmartSafe and Preset Failsafe.
SmartSafe
SmartSafe
™
failsafe is recommended for most aircraft.
When the transmitter and receiver are turned on, the receiver connects to the 
transmitter and normal control of all channels occurs. If loss of signal occurs, 
SmartSafe moves the throttle channel to its preset failsafe position (low throttle) 
that was set during binding. All other channels hold their last position. When the 
receiver detects signal from the transmitter, normal aircraft operation resumes.
Receiver Power Only
•		 With	SmartSafe	technology	when	the	receiver	only	is	turned	on	(no	
transmitter signal is present), the throttle channel has no output, to avoid 
operating or arming the electronic speed control. 
•	 All	other	channels	are	driven	to	their	preset	failsafe	positions	set	during	binding.
Range Testing
Before each flying session and especially with a new model, it is important to 
perform a range check. All Spektrum aircraft transmitters incorporate a range 
testing system which, when activated, reduces the output power, allowing 
a range check. 
1. With the model restrained on the ground, stand 30 paces (approx. 90 
feet/28 meters) away from the model.
2. Face the model with the transmitter in your normal flying position and place
your transmitter into range check mode.
3. You should have total control of the model with the button depressed at 30
paces (90 feet/28 meters).
4. If control issues exist, contact the appropriate product support department.
Advanced Range Testing
For sophisticated models that have significant conductive material in them, the 
Advanced range test using a flight log is recommended. The advanced range 
check will confirm that the internal and remote receivers are operating optimally 
and that the installation (position of the receivers) is optimized for the specific 
aircraft. This Advanced Range Check allows the RF performance of each receiver 
to be evaluated and to optimize the locations of the remote receiver.
IMPORTANT: If you don’t have a telemetry-capable transmitter or an STi
™
interface, you can connect a Flight Log to the BIND/Prog port on the receiver.
1. Standing 30 paces away from the model, face the model with the transmitter in
your normal flying position.
