Traxxas E-Revo Owner's Manual download pdf (Page 9)

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THE TRAXXAS TQ RADIO SYSTEM

RADIO SYSTEM TERMINOLOGY

Please take a moment to familiarize yourself with these radio and power system

terms. They will be used throughout this manual.

BEC (Battery Eliminator Circuit) - The BEC can either be in the receiver or

in the ESC. This circuit allows the receiver and servos to be powered by

the main battery pack in an electric model. This eliminates the need to

carry a separate pack of 4 AA batteries to power the radio equipment.

Channel - The 27 MHz

frequency band is

divided into 6 channels

so that up to six models

can be operated

simultaneously. Each

channel is referred to

by its ﬂag color and

channel number, as

shown on the chart to the right.

Clearing your frequency - A routine, verbal check to make sure nobody

else in your area is operating on the same channel. Always clear your

frequency by calling out your channel number before operating your

model. Wait or move to another area if your channel is already being

used.

Crystal (X-tal) - The plug-in device that determines which channel the

radio system will operate on. For each channel, there are two crystals,

one for the receiver and one for the transmitter. Of those two crystals,

the one marked with the lower number (.455 MHz lower) must be

inserted into the receiver.

Current - Current is a measure of power ﬂow through the electronics,

usually measured in amps. If you look at wire like a garden hose, current

is a measure of how much water is ﬂowing through the hose.

ESC (Electronic Speed Control) - An electronic speed control is the

electronic motor control inside the model. Electronic speed controls

use power more efﬁciently than mechanical speed controls so that the

battery runs longer. An electronic speed control also has circuitry that

prevents loss of steering and throttle control as the battery loses its

charge.

Frequency band - The radio frequency used by the transmitter to send

signals to your model. All Traxxas RTR models operate on a 27 MHz

frequency band.

kV Rating - Brushless motors are often rated by their kV number.

The kV rating equals no-load motor rpm with 1 volt applied.

The kV increases as the number of wire turns in the motor decreases. As

the kV increases, the current draw through the electronics also increases.

mAh – Abbreviation for milliamp hour. A measure of the capacity of the

battery pack. The higher the number, the longer the battery will last

between recharges.

Neutral position - The standing position that the servos seek when the

transmitter controls are at the neutral setting.

NiCad - Abbreviation for nickel-cadmium. The original rechargeable hobby

pack, NiCad batteries have very high current handling, high capacity,

and can last up to 1000 charging cycles. Good charging procedures are

required to reduce the possibility of developing a “memory” effect and

shortened run times.

NiMH - Abbreviation for nickel-metal hydride. Rechargeable NiMH

batteries offer high current handling, and much greater resistance to the

“memory” effect. NiMH batteries generally allow higher capacity than

NiCad batteries. They can last up to 500 charge cycles. A peak charger

designed for NiMH batteries is required for optimal performance.

Receiver - The radio unit inside your model that receives signals from the

transmitter and relays them to the servos.

Resistance - In an electrical sense, resistance is a measure of how an

object resists or obstructs the ﬂow of current through it. When ﬂow

is constricted, energy is converted to heat and is lost. Traxxas power

systems are optimized to reduce electrical resistance and the resulting

power-robbing heat.

Servo - Small motor unit in your model that operates the

steering mechanism.

Transmitter - The hand-held radio unit that sends throttle and steering

instructions to your model.

Trim - The ﬁne-tuning adjustment of the neutral position of the servos,

made by adjusting the throttle and steering trim sliders on the face of

the transmitter.

Thermal Shutdown Protection - Temperature sensing electronics used

in the electronic speed control detect overloading and overheating of

the transistor circuitry. If excessive temperature is detected, the unit

automatically shuts down to prevent damage to the electronics.

2-channel radio system - The TQ radio system, consisting of

the receiver, the transmitter, and the servos. The system uses two

channels: one to operate the throttle and one to operate

the steering.

Voltage - Voltage is a measure of the electrical potential

difference between two points, such as between the positive battery

terminal and ground. Using the analogy of the garden hose, while

current is the quantity of water ﬂow in the hose, voltage corresponds to

the pressure that is forcing the water through the hose.

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Traxxas E-Revo Owner's Manual Page 9

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