Micron Radio Control : Model Railway Radio Control

Eliminate worry about dirty track, stalls, shorts and all the frustrations of track power. Battery power and radio control – the future of model railways.

Radio control (R/C) operation of model railways offers considerable advantages over conventional methods, either direct voltage control or DCC. Like DCC, each R/C model is controlled from within the model itself, so there are no problems running more than one train on a track. But, R/C allows battery operation eliminating any worries about dirty tracks, getting stuck on insulated turnout frogs, etc. R/C trains can operate alongside track powered locos, either direct control or DCC.

There is no need to section the track, R/C provides true 'cab control' so you always have full control over your train. Some R/C controllers can handle up to 12 locos, switching 'active' control between each of them. Non-active locos can be configured to either continue at the last setting or stop.

Compared to the complexity involved in trying to achieve the same level of operation from conventional wiring, the installation of a R/C battery operated locomotive is relatively simple. The on-board components consist of a radio receiver, usually with built-in speed controller, batteries and motor connected as shown on the right. A switch is needed to isolate the battery when the loco is not in use and some method of connecting to a charger is also required - both can be achieved simply with micro plugs/sockets. A fuse in the battery positive lead is recommended to protect the battery in case of inadvertent shorts while working on the loco.

The simplest way of getting started is to choose a receiver with lead-out wires for motor and battery: the red and black wires go to the battery and the yellow or white wires go to the motor. Our range of receivers covers all scales and gauges; from N to SM32, Gauge 1 and beyond with motor currents from 0.5A to 6A. If your motor needs more than 6A, a receiver and separate speed controller can be used.

Although most ready-to-run locos have 12V motors to suit powered rail layouts, many trains do not need this voltage. Slow speed operation (e.g narrow gauge and shunting) works well with 6V or less; even main-line locos rarely use more than 9V. These voltages are easily provided from single (3.7V) or double cell (7.4V) Lithium Polymer batteries. Multiple cell LiPo batteries require a balancing charger and multi-wire charge lead (e.g. 4 wires for a 3 cell battery). A simpler solution for > 4V, easier to install and charge, is to use a single cell LiPo with a voltage booster module.

Receiver Options (top)

The receivers have short wire aerials. Some are also available with an extended aerial for use in totally enclosed metal bodied locos. All receivers have multiple auxiliary outputs for controlling lights, coupling actuators, sound modules or whatever on-board function your imagination wants to implement.

The receivers contain extensive programmable features so that you can implement exactly the model control you need. Each receiver is available with several 'variants' which provide a selection of the programmable features appropriate for a typical use.

When installing a miniature receiver in your model, you must ensure that no force or stress is applied to the circuit board. Miniaturisation requires thin materials which must naturally be handled gently. Most of the receivers are supplied as bare boards and care must be taken to avoid shorting the circuit board tracks. A heat shrink sleeve cover will provde protection and this is available as a no-cost option on many of the receivers we stock. Also, the motor output must not be shorted.

All receivers have several auxiliary outputs in addition to the motor controller. These can be used for controlling lights, sound cards, smoke generators, couplers, etc. Use of these outputs is highly variable as it depends on what additional behaviour you want to build into your model. Please contact Micron if you want to discuss the options.

Deltang receiver outputs are labelled 'H', 'P' and 'F' to denote their capability:

We have a range of compatible hand-held transmitter controllers from simple, single loco to multi-train units. All are pocket sized and available with forward / reverse on one knob or full-range throttle and separate direction control. We can also build bespoke controllers with knobs, switches, push buttons to match your needs.

Many transmitters can be used simultaneously without frequency control or crystals. For this to work, every receiver needs to be paired with one transmitter in a process called binding. During binding, the transmitter's unique ID (GUID) is given to the receiver. The receiver then only obeys that transmitter. A receiver needs binding only once. When the receiver is switched on, it searches for its bound transmitter - which is why the transmitter should be switched on first.

The transmitter can share its GUID with any number of receivers. One transmitter can control any number of locomotives, but they all receive the same signals so you normally only have one loco switched on at a time. Some of the Deltang transmitters have the 'Selecta' feature which is used to select a loco to control. When used with a Selecta enabled receiver (variant -22), the position of the Selecta switch is stored by the receiver during bind. This allows up to 12 locos to be switched on at the same time and the Selecta switch controls which loco is currently active. The Selecta feature is supported in most receivers, but must be enabled before use.

All Micron controllers and receivers operate on 2.4GHz using the popular Spektrum DSM2/DSMX protocols. This means that they are compatible with a wide range of other R/C equipment.

The Tx21v2 and Tx22v2 transmitters have an 'inertia' control which sets the loco acceleration and deceleration behaviour. Inertia is implemented in the transmitter to ensure compatibility with all model rail receivers. Many receivers also have a built-in inertia function which may be enabled by programming the receiver.

Whilst it is possible to run locos with non rechargeable batteries, it is more economical to use rechargeable batteries. On-board batteries can be NiMH, LiIon or LiPo. LiPo and LiPo provide the best size/capacity ratio and ease of installation. All batteries need careful handling, shorting any type will result in lots of heat and you MUST use a resettable fuse in the positive lead as close as possible to the battery - definitely before the on/off switch and charge socket. This is to protect your model in the event of a wiring fault.

When selecting a battery for your loco, you need to look for the highest capacity that will fit into the available space as this will give the longest run-time before needing a charge. If shape of the internal space will not allow for a multi-cell battery, separate cells with interconnecting wires can be used.

Batteries can be charged in the model and LiIon/LiPo can be frequently topped up when the loco is resting. NiMH is best run until discharged and then fully charged to avoid voltage depletion (aka 'memory effect'). Most locos do not need the full 12V - 4V or 8V from 1 or 2 LiPo cells is usually sufficient. LiPo cells come in a wide range of shapes and sizes making it easy to fit into your loco, tender or wagon.

If the loco has a DCC socket, the actual installation can be easy as connecting the receiver motor output to the DCC socket motor pins. Otherwise:

More complex installations add lighting, sound, smoke control, couplers, ... The Deltang range of receivers is capable of handling it all.