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Deltang Tx23 User Information

Tx23 is a compact transmitter for controlling 3 model railway locomotives. It has separate throttle knobs for each locomotive so that they may be controlled independently. Other controls include a direction/auxiliary toggle switch for each locomotive and a common inertia knob. The toggle switch can be used either for direction (forward/reverse) or for switching lights or to trigger sound modules.

If the toggle switch is to be used for direction control, the receivers must be configured for low-off throttle - the default setup for Deltang receivers is centre-off throttle (forward and reverse on the throttle knob).


  • Tx23 uses the 2.4GHz band which requires no frequency channel control and is very resilient against interference. All radio frequency components are contained on the internal Tx2 module. There are no user adjustable parts on this module and it should not be modified.
  • Tx23 is compatible with all DSM2 receivers. This includes all Deltang receivers.
  • Any number of receivers can be bound to your Tx23 but only three, configured for different throttle positions, may be switched on at a time to operate them independently.
  • Range is suitable for indoors and small outdoor sites; the outdoor free-air range to a Deltang receiver is at least 50m. Range indoors is affected by building construction materials, furniture, people and receiver installation.
  • Knob and switch positions are transmitted as separate 'channels' (1-7) which must match the receiver configuration:
throttle:channels 1, 2 and 6 (left to right)
toggle switch:channels 3, 5 and 7 (left to right)
inertia:used internally
bind button:channel 5 (shares this channel with #2 toggle switch)


  • Tx23 uses a PP3 9V battery, preferably Alkaline or NiMH /Lithium rechargeable.
  • Remove the 4 screws holding the back of the case to insert or replace the battery. The image shows the orientation. There are some bare wires inside so care needs to be taken when installing the battery to avoid short circuits. The battery is held in place between the throttle controls and the back of the case. If the battery is able to move (test by gently shaking the case with battery and back installed), use a piece of foam glued to the inside of the back cover.
  • Make sure that the power on/off button is off (up) before) adding or removing a battery.
  • The connector will only clip onto the battery one way. TAKE CARE, if force is needed, the connector is probably the wrong way round. On ready-built Tx23, there is a diode in series with the battery negative lead to prevent damage should the battery be connected incorrectly.

On / Off Push Button

  • Tx23 has an illuminated push-button on/off switch. It is best to switch the transmitter on before the receiver.
  • The LED flickers slightly while an inertia transition is in progress.
  • The LED flashes more boldly when binding.

Speed / Throttle Knobs

  • 300° rotary controls with 'centre click' (the tx is optionally available with no click and a front-panel legend showing Min..Max instead of Rev..Fwd)
  • The throttle knobs control channels 1, 2 and 6 (locomotives 1-3, left to right)
  • Full rotation is either 'centre off' or 'low off' 0-100% motor control (depends on receiver setup).
    • Use the program 1,1,2,1,3 to configure a Deltang receiver for full range throttle on channel 1 and direction control on channel 3 (1,1,2,2,5 for the centre controls and 1,1,2,6,7 for the right hand controls)

Toggle Switch

  • 2-way switches
    • direction control (with receivers that have this capability), or
    • lighting or sound module triggers
  • Channels 3, 5 and 7 (left to right)


    • Inertia 'dampens' or slows down throttle changes
    • Varies from off (no effect) to 30 seconds advance or retard
    • The throttle knob sets sets a 'target' and Inertia changes throttle slowly until it reaches that target. The LED flickers while a change is in progress.
    • Inertia is common to all throttles
    • To stop quickly both Throttle and Inertia must be in the 'off' position. Inertia is off when turned fully to the left.

    Bind Button

    If a receiver has not previously been bound, it has to be 'paired' with the transmitter. Binding is only required once per receiver.

    1. Put your receiver into Bind mode (if a Deltang receiver, switch it on and wait for the LED to flash fast).
    2. Press and hold the Bind push-button on the transmitter.
    3. Switch the transmitter on by pushing the Power button and then release the Bind button.
    4. Binding is complete when the receiver LED stops flashing.

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