Futaba 8SGAP User Manual download pdf (Page 7)

•GLOSSARY OF TERMS

NOTE: Please take the time to familiarize yourself with the terms and abbreviations

below. They will be used throughout the instructions and are important in understand-

ing the operation and potential of your system.

PCM (Pulse Code Modulation)

Pulse Code Modulation utilizes a precise digital

code to convey information from the transmitter

encoder to the receiver. This state of the art meth-

od makes many of the sophisticated functions of

the FP-8SGAP possible, as well as providing far

superior immunity to noise and interference than

is possible with conventional encoding methods.

ATV (Adjustable Travel Volume)

This feature allows independent adjustment of

servo travel in each direction. ATV is sometimes

referred to as "endpoint adjustment". Two dif-

ferent types of ATV are standard with this system,

(1) Pushbutton or Programmed (Memory) ATV

and (2) 2nd ATV (Conventional).

MEMORY ATV

This type is available on all eight channels. These

adjustments are stored in the transmitter memory

circuit and are retained when the power switch is

turned OFF. They are lost however, if the trans-

mitter Nicd batteries reach full discharge.

2ND

ATV

Available on Aileron (CH 1) and Elevator (CH 2).

This is the conventional type ATV which is set

using trimmer pots on the transmitter back panel.

These

settings are

NOT affected if the transmitter

batteries are discharged.

DUAL RATE

Rate switches allow the pilot to select different

servo travel limits (for varying control sensitivity)

in flight. Servo travel is affected equally in both

directions from center.

SAFETY

(ACT/INHIB)

SWITCHES

These switches, located on the transmitter trimmer

panel allow mixing and certain other functions to

be deactivated when not desired. When the Safety

Switches are set to the INHIB position, the func-

tion will remain OFF even if the transmitter con-

trol switch is set to ON.

VTR (VARIABLE TRACE RATIO)

This is a special type of non-linear control re-

sponse. When VTR is used, servo travel is normal

and linear up to about 80 percent of the transmit-

ter control stick movement where the servo travel

is abruptly increased to a higher rate (both rates

adjustable). This allows a normal feel for most fly-

ing with extra movement available for emergencies

and certain aerobatic maneuvers. Another way to

think of this function is as "automatic Dual Rate".

SERVO

REVERSING

This function allows the modeler to reverse the

direction of servo movement (in relation to con-

trol stick movement) for various installation re-

quirements. This can be done by conveniently

flipping a switch on the trimmer panel. Servo

travel and neutral position are not affected.

BFS

(Battery

Fail

Safe)

This function provides a warning to the flyer when

airborne battery voltage reaches a critically low

level

by moving

the

throttle

servo

medium

slow

or slow position.

ATL (Adjustable Throttle Limit)

This feature makes adjusting the throttle linkage

much

easier.

The

throttle

trim

lever

affects

only

the LOW or IDLE position and not the HIGH

throttle servo position. Therefore, the linkage can

be set for proper opening at high throttle and the

trim

lever used

set

the

proper

idle

speed

with-

out changing the maximum opening.

MIXING

In general, mixing functions allow two or more

different channels to be operated by moving a

single transmitter control. Many useful and versa-

tile functions are made possible in this manner.

Three types of mixing functions are provided.

(1) Unidirectional mixing — This function allows

one or more channels to be "slaved" to a "master"

channel. Movement of the master channel control

causes movement of both master and slaved servos

simultaneously. Operation of the slave channel

control however, does not cause movement of the

master channel servo. An example is Aileron/Rud-

der mixing (see page 33) where the Rudder is

slaved to Ailerons for coordinated turns.

(2) Mutual (Bi-Directional) Mixing — With this

type of mixing, two channels are mixed so that

operation of the control for either channel causes

movement of both servos. This is useful in provid-

ing sophisticated functions such as V-tail opera-

tion,

flaprons, and

elevons

tailless

designs.

(3) Switch-Activated Mixing — Two or more

channels can be programmed so that the servos

involved move to a preset position when a trans-

mitter control switch is pulled or button pushed.

Snap roll switches, roll buttons, and pre-set flap

switches are examples of this type of mixing.

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Futaba 8SGAP User Manual Page 7

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