remote control for model railways
Designed and manufactured by A1Results
Copyright A1 Results 2014

These notes explain the installation and operation of RED ARROW.

The loco/motor unit receiver is supplied with fitting instructions but if you have any questions that are not answered from the instructions or this page please do give us a call. In our view it's better to be sure that the equipment is fitted correctly as electronics are sensitive to incorrect wiring.

The receiver fits into the locomotive or diesel/electric motor unit along with the battery, infra-red detector, isolating switch and, if required, charger connections.


Once the receiver is installed in the motor unit it must be programmed from the controller.

Each unit is given a unique code, say 1 or 11 for loco 1, 2 or 22 for loco 2, or whatever numbers you prefer.

(It can be advisable to do the following on a test bench first, maybe even before installing into the power unit or locomotive itself)

With the controller pointing only at the detector of the motor unit to be coded and the loco power switched on:

(note: the keypad buttons should be pressed 'definitely' as it may not respond to very short light presses)

1. Enter the chosen code e.g. 11 (where a single digit is chosen it will show with a zero e.g. 02)

2. The display now shows 11

3. Press either direction key (F or R)

4. Enter the code a second time.

5. The display now shows 11 11.

6. Press either direction key again

NOTE: at this stage decide on the pre-programmed acceleration that you want (this can easily be changed later by just repeating this exercise). The ‘S’ button gives the slowest acceleration, the down arrow gives


To move a loco: (all the following require the unit to be pointed at the loco detector)

1. Enter the code for that particular loco (this step is only required if this is the first instruction from powering up, or the ‘!’ key has been used).

2. Press a direction key

3. Press repeatedly the acceleration button (up arrow) until the loco moves.

4. Continue until the required speed is reached.

Once the loco is moving it will continue at the given speed without receiving a signal.

To reduce speed and stop:

Use the deceleration button (down arrow) to reduce speed and bring the loco to a halt

To change direction:

1. Bring the loco to a halt

2. Press the ‘S’ stop button (direction cannot be changed unless the 'S' button has been pressed.

3. Press the F or R button to select a direction and then carry on as usual.

For a short stop there is no need to press the ‘S’ stop button. The loco will then start quicker when the acceleration button is pressed again to move the loco off.

If this is done the receiver will still be drawing a current so if the loco is to be stationary for a while it is better to use the ‘S’ button (once the loco is at a halt) to remove all but a very small input to the receiver.

The '!’ BUTTON

removes power and will therefore stop ALL motors that receive the message (it is not code dependant). Use as an emergency stop, and to clear the display on the controller, after which the loco code will need to be re-entered.


All motors have a need for a certain voltage to start moving so when the acceleration button is used there is a delay in the loco starting.

It is possible to programme the receiver so that when the acceleration button is pressed it starts at a preset voltage and therefore movement takes place almost immediately. You will have to enter a code into the transmitter. Each step from 0 to 9 is an increase of 5% in the voltage, starting from zero. 0 therefore gives 0% (i.e. the motor voltage starts from zero when the acceleration button is first used) and 9 gives 9x5% i.e. 45% of the maximum voltage available which for a 9 volt battery is 4 volts. Some trial and error will find a suitable percentage.

In this example pressing the 4 key gives 4x5% = 20% = 1.8 volts with a 9 volt battery

To do this (with the transmitter pointing at the powered up motor unit)

1. Select the loco code e.g. 11

2. Press the 4 button

The display will now show either 11 4 or 11F4 (variation is due to supply of the display chip used)

3. Press the ‘S’ key to send the code and complete the sequence.

4. Press the ! key to clear the display.



Fitting two detectors

It can be an advantage to fit two IR detectors, for example in a diesel loco with a cab at each end.

In this case extra wires must be carefully soldered to the receiver module in a siamese fashion.

See the wiring diagram earlier.

Special batteries

Some special batteries are available to order, for example for installing into boilers of steam locos (approx 10 and 15mm diameter).

It is often more convenient to install the system into the tender, but obviously this is not possible for tank locos.

Please call us to discuss your requirements if you think that only a custom battery will do the job.

Using high current motors

If a high current motor (upwards of ?? amp) is being used it may be necessary to attach a heat sink to the receiver to prevent it burning out. If you are unsure please do seek advice from us.


Please note that we cannot accept any responsibility for damage to the receiver where

• electrical connections are made incorrectly

• soldering new connections leads to overheating of the module

• there is a failure to fit a heat sink if one is required..

item6e item6d item6c item6b1 item6a1 item6b