Traxxas 4902 Owner'S Manual Download

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T-MAXX 2.5R

Radio System Terminology

Please take a moment to familiarize yourself with these radio-system
terms. They will be used throughout this manual.

5-Cell Pack

– Another term for RX Pack or rechargeable receiver pack.

The RX pack is made up of five rechargeable NiMH battery cells and is
used in place of the 4AA batteries in the model.

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 below.

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 “RX” with the lower number (.455 MHz lower) must be
inserted into the receiver.

Frequency band

- The radio frequency used by the transmitter to send

signals to your T-Maxx 2.5R. All Traxxas RTR models operate on a 27
MHz frequency band.

mAh

– Abbreviation for milliamp hour. 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 T-Maxx 2.5R that receives signals

from the transmitter and relays them to the servos.

RX Pack

- RX is a common abbreviation for the radio receiver and items

associated with it. RX Pack denotes the optional rechargeable battery
pack used to power the radio system in the model. It is available as
Traxxas part number 3037.

Servos

- Small motor units in your T-Maxx 2.5R that operate the throttle

and steering mechanisms.

Three-channel radio system

- The TQ-3 radio system, consisting of the

receiver, the transmitter, and the servos. The system uses three
channels: one to operate the throttle, one to shift the transmission,
and one to operate the steering.

Transmitter

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

instructions to your T-Maxx 2.5R.

Trim

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

made by turning the throttle and steering trim knobs on the face of
the transmitter.

The Traxxas TQ-3 Radio System

Channel

Frequency

Band

Flag

Color