Radio for Trains
Three N gauge locos and one HO
Rx60, Rx41d, Rx45 receivers
Tx1-J and Tx21 transmitters
80, 180 and 600mAh lipos
for battery, motor, charge socket and switch
The easiest way to radio control a train is to start with a receiver that comes with wires. These receivers also have protective heatshrink covering. The receiver (Rx) is installed in the loco. The red and black wires are connected to a battery, usually via a switch. The two brown wires are connected to the motor.
The receiver in the loco can only be controlled by a compatible transmitter. 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.
The transmitter can share its Guid with any number of receivers. So one transmitter can control any number of trains. But they all receive the same signals so you normally only have one loco switched on at a time. However, the DelTang Tx22 also has the Selecta 'loco selector switch'. If used with Rx6x receivers, the receiver also learns the position of the Selecta switch during binding. This allows up to 12 locos to be switched on together and the Selecta switch controls which loco is currently active. The Selecta feature only exists in Rx6x receivers and Rx102-22.
MAIN STARTER OPTIONS
Rx60-22-W and Tx22 are intended to be used together. Only receivers with -22 in the name are supplied with the Selecta feature enabled.
Rx41-2-W and Tx21 are smaller. But the receiver can only be used with lower voltages and currents and neither have the Selecta feature.
Rx60-1-W and Rx41-1-W are intended for use with joystick transmitters (eg: the 'Blade' transmitter - E-flite / Parkzone / HobbyZone / MLP4DSM / EFLH1064 / PKZ3341).
These receivers all have integrated forward/reverse throttles which give very fine low speed control in both directions.
Single cell Lithium Polymer batteries are attractive because they are the easiest to install and charge. However, each lipo is used from 4.2v down to 3v and most motors in locos need higher voltages. So two cell lipos (often sold as '2S' or '7.4v') are quite common. Always look for the largest capacity (mAh rating) that will fit to maximise run time. The 'C' rating is not normally important for trains so buy the cheapest you can find. Hobby stores sell Lipo chargers. Or you can make your own with an L200C regulator.
1. The battery voltage when fully charged must not exceed the maximum allowed for the chosen receiver.
2. The motor current when stalled must not exceed the maximum allowed for the chosen receiver.
3. Do not apply great force to the receiver.
4. Do not create short circuits.
After motor control, lights become a common requirement. Led's are usually used. 'High brightness' are recommended because they can be run at low currents (eg: 3mA). 'Warm' white is available but less common. Led's need current limiting resistors. 220-470 ohms are probably appropriate values.
Servos can be used for couplings or hatches. You may need a UBEC to power it.
As you start considering extra features like these, Rx61 is easier to use. See here a full list of features in Rx6x receivers.
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