Download Tx21 Throttle Assembly Notes

Tx21 Throttle Assembly Notes
NOTES:
1. The circuit diagram shows the required connections. The photos are an example of how it can
be done.
2. It is easiest to press the black plastic pushbutton into a 7mm hole using the throttle knob and
nut as spacer.
3. The 'Tx2' radio module is powered with 9v. Tx2 has an on-board regulator which provides a
3.1v reference voltage to the other components.
4. The 2 longer wires in the middle of the on/off switch are 'Led2'. The shorter of those is
marked '-' and goes to negative.
5. The on/off switch has an anti-rotation ridge that makes its diameter larger at that point. File a
notch in the box to avoid crushing the switch.
6. The pots have a protrusion to prevent body rotation. These are not needed and can be cut off
with side-cutters or hacksaw.
7. If the Inertia pot is not installed, Pin6 must be grounded to prevent random motor behavior.
8. The Tx2 module can be protected with with the heatshrink covering provided.
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Tx21 Throttle Assembly Notes
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Tx21 Throttle Assembly Notes
CALIBRATION:
The motor control pot (Ch1) has a 'click' at the center position. When Throttle is used 'center off'
it needs to center accurately so that the 'click' on the Tx matches the 'off' position in DelTang
receivers. Calibration is done using the Bind button while Tx21 is on. After pressing the Bind
button for ~20s Ch1 is calibrated. Calibration is only possible in the first 60 seconds of switching
the transmitter on.
Calibration is REQUIRED, whether or not you will be using the ‘center-off’ throttle
control.
1.
2.
3.
4.
5.
Switch Tx21 on. The led will come on.
Rotate the Inertia button fully anti-clockwise (left) so it has no effect on Throttle.
Center the Motor pot.
Press and hold the Bind button for ~20s until the led goes off. Ch1 should now be calibrated.
Release the Bind button. The led will come back on.
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