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   INFORMATION - What servos connect to what connections in the RX (Radio Receiver)

Many people get confused when trying to connect the Radio receiver in their electric powered helicopters, and this is quite understandable as the documentation is usually less than helpful to those that do not understood it all.

So this Tip and Trick will try to cut through the jargon and let you now how to work out the connections on most types of radios.

One of the first areas people don't understand is how there are TWO AILERON SERVOS.  Well, one one side they are called AILERON, but the other side is not called that at all, it is commonly known as PITCH.  However, very few RX have a PITCH connection, and you need to use the AUX1 connection.

Also, some RX units have names for the connections, others use numbers alone, which is even harder to understand.

So let's look first at a very common 6 channel receiver, the one provided by ESKY for the Belt CP. You can see below that it uses numbering, starting from 1 and going through to 6 with an additional B connection at the far end.

The Esky 6 channel Rx, which uses numbering to identify the channels.  NB - MOST RX's use the same numbers to identify the same channels.

In this case we have Channels 1-6 + a B Channel

This is an older NEC 7 channel receiver, and you may have already noticed that it has a Batter channel at the left end, so yes, you were right, that is exactly what the "B" means on the Esky RX.
So, by looking at the NEC RX (above right), we can see quite easily what the various channels re for on BOTH RX's.
Channel 1
Channel 2
Channel 3
Channel 4
Channel 5
Channel 6
Channel 7
Channel B
Aileron (NB - maybe the left or right servo)
GEAR (often used for gyro control in helicopters)
Auxiliary 1 (Used as Pitch, or in other words, the OTHER Aileron servo)
Auxiliary 2 (Spare for helicopters)
Battery - only used if you use an board 4.8V battery pack to power the Radio equipment
So, now you can hopefully see the correlation between numbers and actual words.  Almost ALL RX's will use this same channel layout on their RX's.

Equally important to know about is the way around the connections should be made. The servo wires have either Red, Black and white wires, or Orange, Brown and yellow which corresponds to the previous wiring colour directly. In both cases, the white or yellow leads are the SIGNAL lead.

All connections to the RX MUST HAVE THE CONNECTIONS THE SAME WAY AROUND, so that the white lead is always the same side.  Although not guaranteed,  most RX's expect the white signal lead to be on the logical top of each connection

The Black and red wires are the power, and in fact, these two pins are connected right across the RX internally, so as long as you get the wire from the ESC the right way around, ALL other connectors will immediately have power on them.

So, as far as electric powered helicopters are concerned : 

THROTTLE channel is where you plug the 3 wire lead in from the ESC (Electronic Speed Controller).

AILERON Channel is where one or other of the aileron servos are connected. This can vary, so it is often a matter of trial and error to see which is correct for which servo.  If the swash plate moves the wrong way when you move the cyclic stick left and right, switch the connections between channel 2 and channel 6.

ELEVATOR Channel is where you plug in the 3 wire lead from the elevator servo

RUDDER Channel is where you plug in the 3 wire lead from the rudder servo, or more commonly, the lead from the gyro, and then connecting the rudder servo to the connector provided on the gyro so that the gyro is in circuit with the rudder servo.

GEAR Channel is of no real use to many helicopters, and is almost universally used to control the gain of the gyro, which switches it between RATE mode and HH (Heading Hold) modes. Quite often you will find this is just a single wire connection that comes from the gyro, and the wire must go into the signal channel in the RX.  You can use a different channel on computer radios if you wish by programming your selection in the TX.

AUXILIARY 1 handles the OTHER AILERON Channel, together with Channel 1.

AUXILIARY 2 is a usually a spare Channel if you have it.  Some expensive radios may have even more AUX Channels, but these are always programmed for use in the Radio TX.

BATTERY is rarely used with electric helicopters, as we use the main LIPO battery for all our power requirements via the ESC.  However, those flying nitro and gasser helicopters will use this to provide the power to the radio system and servos as they will not have a Lipo or an ESC.



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