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T-80RF user’s guide

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FMA Direct

Thank you for purchasing the FMA Direct T-80RF radio control
transmitter.  This unit provides narrowband FM output with
PPM encoding for radio controlled aircraft and surface craft
(boats, cars and hovercraft).  The transmitter operates on any
72MHz RC aircraft channel (11 through 60) or 75MHz surface
channel (61 through 90) when equipped with an appropriate
crystal. It offers user-selectable positive or negative shift, ena-
bling it to work with any 72MHz PPM receiver on the same
channel.  The T-80RF uses the latest microprocessor technology
to control every function of the radio and provide such features
as servo reversing on all channels, tri-rates and elevon/V-tail
mixing.

This manual provides information for setting up and using the
T-80RF transmitter.  Please read it carefully before using the
transmitter.  The manual contains sections covering:

Safety

precautions

Other radio components you’ll need

Identifying transmitter components

Installing

the

antenna

Powering the transmitter

Setting up the radio system

Conducting a radio system preflight check

Troubleshooting

Introduction

T-80RF features

Frequency selection.

The T-80RF can transmit on any one

of the fifty 72MHz or 75 MHz channels (11 through 90)
allocated for radio controlled aircraft. One crystal is
provided for the channel you selected when you purchased
the transmitter. (According to F.C.C regulations, you cannot
change the crystal in your transmitter unless you are a valid
holder of an F.C.C. Second Class or First Class Operator’s
License.)

Mixing.

The T-80RF can be set to mix elevator and aileron

controls for use with aircraft incorporating elevons (for
example, flying wings) or V-tails. (For best results, center
control surfaces mechanically after trimming in flight.)

Servo reversing.

Switches conveniently located on the

front panel change the direction of servo rotation. This
enables you to install servos and linkages in the best
mechanical configuration, then simply change a switch to
obtain the correct direction of motion.

Tri-rates.

Tri-rates, set by a switch on the front of the

transmitter, desensitize controls while you are learning to fly
(beginners tend to over-control). The T-80RF provides 50%
and 75% throws (in addition to the full 100% throw)
simultaneously on the aileron, elevator and rudder channels.
The T80RF is particularly useful for reducing the throw on
small aircraft using short control horns.

Trims.

Each of the four channels has a trim adjustment to

compensate for variations in the model and local flying
conditions.

Battery indicator.

Transmitter battery status is displayed

when the transmitter is on, enabling you to check for safe
battery power level at a glance.

Selectable frequency shift.

The T-80RF can be used with

any narrowband FM PPM receiver you already own.

Ergonomic design.

Ribbed case and concave stick tips give

you a solid grip on the transmitter and controls, allowing
you focus on smooth and safe operation of your model.
Recessed power switch helps prevent accidental shut-off.

Function

4-channel computer-controlled FM radio control transmitter

Size

6.75" wide x 2.6" deep x 6.25" high (including handle, not including antenna)

Weight

15.6 oz. (without batteries)

Frequencies

All U.S. 72 and 75 MHz radio controlled aircraft frequencies: Channel 11 through Channel 90

Power

8 AA alkaline batteries or optional 8-cell, 600 milliamp NiCad battery pack

Current drain

185 milliamps