Tx21 Transmitter

Tx21 is a hand-held wireless transmitter intended to control 1 model railway train engine.
It has controls for Speed, Direction, Inertia, Lights and Coupling.

300° rotary control with 'center click'.
Full rotation is either 'low off' 0-100% motor control or 'center off' (depends on receiver).
The Speed knob controls Channel 1 and Channel 6.

The Direction switch is used to select forward/reverse with receivers that have 'low off' motor control.
This switch can control lights instead of direction with receivers that have 'center off' motor control.
The Direction switch controls Channel 3.

Inertia 'dampens' or slows down changes to Throttle (Ch1 and Ch6).
The Speed knob sets a 'target' and Inertia changes throttle slowly until it reaches that target. The Led flickers while a change is in progress.
To stop quickly Throttle and Inertia must be in the 'off' position. Inertia is off when turned fully to the left.

Tx21 has an illuminated push-button on/off switch. It is best to switch Tx21 on before the receiver.
The Led flickers slightly while an Inertia transition is in progress.
The Led flashes more boldly when Binding.

If a receiver has not previously been bound, it has to be 'paired' with Tx21. Binding is only required once per receiver.
1. Put your receiver into Bind mode (switch it on and wait for led to flash fast).
2. Press and hold the Bind push-button on Tx21.
3. Switch Tx21 on and then release the Bind button.
4. Binding is complete when the Led stops flashing.

Once the Tx is switched on, the Bind button acts as a simple switch.

Tx21 uses the 2.4GHz band which requires no frequency channel control and is very resilient against interference.
Any number of receivers can be bound to your Tx21 but only one can be switched on at a time to operate them independently.
Range is suitable for indoors and small outdoor sites.

Tx21 is compatible with all DSM2 receivers. This includes all DelTang receivers.
Knob and switch positions are transmitted as separate 'channels' (1-7) which must match those used in receivers.

Tx21 is powered with a standard 9v PP3 battery.
It has some bare wires inside so care needs to be taken when installing the battery to avoid short circuits.

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