10CH TXT Essential Instructions v1.docx 2024-09-05 16
Note that either R1 or R2 or both must be ON for stabilization to be active. Thus, setting R3 without either
Option B or Option C will have no effect. Settings are retained even when power is removed.
Once a stabilized option is set, stabilization can be turned on and off in flight by a switch on the transmitter.
When stabilization is ON, the green Status LED will be illuminated.
Green Stabilization Direction LEDs
The three green LEDs next to the red mode LEDs indicate whether stabilization direction of each of the control
channels (A, E, R) is Normal (OFF) or Reversed (ON). The definition of normal and reversed is purely arbitrary and
stabilization direction on each axis MUST be determined by physical testing. Direction is changed using Text
Display. See item 7 on page 9.
Stabilization ON/OFF
By default, Stabilization ON/OFF is controlled by a switch assigned to CH7 (Aux2). This can be changed in Text
Display to CH5 (Gear). Whether stabilization is ON or OFF is indicated by the green Status LED beside the red
receiver Status LED.
User-set Failsafe LED
A green Setup LED indicates that User-set Failsafe is active. This can be cancelled in Text Display.
Appendix 3: Understanding Throttle Lock
Note that TL in the Text Display screens refers to "Throttle Lock", not telemetry. It is a function that alters User-
Set Failsafe behaviour.
How User-Set Failsafe works
User-Set Failsafe kicks in if the receiver loses transmitter signal for approximately one second.
If TL is ON, then when signal loss is detected a series of Throttle OFF commands (-100% pulses) is sent for the
first 0.1 seconds, after which all channels go to logic low. The effect of this is to force the ESC instantly to zero
and keep it there by stopping servo pulses. The reason for the brief initial -100% command is that a few ESCs will
run the motor briefly when signal is lost if the last known throttle channel value is not -100%. For failsafe the
motor should ideally stop instantly, and the control surfaces should stay where they were when signal was lost.
Meanwhile the receiver looks for a valid signal; if found, full control is restored. If not, after 2 seconds, the
receiver outputs the user-set channel values to all the connected servos/ESC indefinitely until a radio signal is
found.
If TL is OFF, then if signal loss is detected all channels go to logic low, meaning no servo pulses are sent.
Normally, the ESC detects the loss of control pulses and stops the motor and the control surfaces will stay where
they were when signal was lost. Meanwhile the receiver looks for a valid signal; if found, full control is restored.
If not, after 2 seconds, the receiver outputs the user-set channel values to all the connected servos/ESC
indefinitely until a radio signal is found.
If User-Set Failsafe is not set, then the receiver will in all cases output no pulses until the signal is restored.
Why is Throttle Lock an option?
TL is set to ON by default. When User-Set Failsafe kicks in, Channel 1 is instantly changed to -100% (low throttle)
and then to no pulse. After 2 seconds all channels move to the user-set fail-safe positions. For most people flying
Spektrum channel-order electric planes, this is the desired behaviour.
Some fliers, however, notably glider pilots, use Channel 1 for a different purpose such as a flight control surface;
having the control move briefly to -100% on failsafe is an issue — sometimes an alarming one! Also, TL should
not be used with models that have an IC engine. Hence the option to have the TL OFF.
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