Manual Spektrum DX18 - SPM18000 (page 35 of 42) (English)

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35SPEKTRUM DX18 • TRANSMITTER INSTRUCTION MANUAL

NOTICE: The DSMX DX18 is compatible with all current Spe-

ktrum DSM2 and DSMX aircraft receivers, but NOT compatible

with the original DSM AR6000 receiver.

Power System Requirements

Set up and operate a model so power to the receiver is NEVER

interrupted while ﬂ ying. This is especially critical on giant-scale

models that use several high-torque or high-current servos.

Power systems unable to provide minimum receiver voltage

in ﬂ ight are the number-one cause of in-ﬂ ight failures. Some

components that cause a receiver to have too little power supply

include:

• Receiver battery

(number of cells, capacity, cell type, state of charge)

• Switch harness

• Battery leads

• Regulator (where used),

• Power bus (where used)

A Spektrum receiver’s minimum operational voltage is 3.5 volts.

This battery charge capacity compensates for discharge during

ﬂ ight or for ﬂ ight loads larger than ground test loads.

CAUTION: We recommend that you DO NOT ﬂ y a model

with battery charges at less than 5.3-volts.

Recommended Power System Guidelines

1. When setting up large or complex aircraft with multiple high-

torque servos, use a current and voltmeter (HAN172). Plug

the voltmeter in an open channel port in the receiver, and

with the system on, load the control surfaces on your aircraft

by applying pressure with your hand. Monitor the current as

you load control surfaces. The voltage should remain above

4.8 volts even when all servos are heavily loaded.

2. With the current meter inline with the receiver battery lead,

load control surfaces while monitoring the current. The

maximum continuous recommended current for a single

heavy-duty servo/battery lead is 3 amps. Short-duration cur-

rent spikes of up to 5 amps are acceptable. If your system

draws more than these currents, you need to use multiple

packs of the same capacity with multiple switches and

multiple leads plugged into the receiver.

3. If using a regulator, perform tests for a 5-minute period. A

regulator may provide adequate short-term power, but this

tests its ability to maintain voltage at signiﬁ cant power levels

over time.

4. For really large aircraft or complex models, multiple battery

packs with multiple switch harnesses are necessary. No

matter what power systems you choose, always carry out

test #1. Make sure the receiver is constantly provided with

4.8 volts or more under all conditions.

CAUTION: When charging any brand of NiMH battery

pack, make sure the battery is fully charged. Due to the

nature of peak charges and variations in charging rates, heat

development, and cell types–the capacity reading of a battery

charged on a fast peak charger may only reach 80% of its

nominal value. Use a charger that displays total charge capacity.

Note the number of mAh put into a discharged pack to verify the

charge is at full capacity.

Mode Conversion

You can perform mode changes in the System Settings screen.

However, if you desire to change modes between 1 and 2 or

between 3 and 4, please contact Horizon Hobby for assistance

due to requirements for changing gimbals.

Adjust Stick Tension

Adjust stick tension using the screws on the stick gimbals

through holes in the back of the transmitter.

1. Remove rubber plugs from holes marked with a vertical

arrow or a horizontal arrow.

2. Turn the screws in these holes a small amount using a small

Phillips screwdriver to adjust tension on the vertical and

horizontal gimbals.

NOTICE: Always do a test of stick tension while turning these

screws to ensure stick tension is not too loose or too tight.

Tightening a screw too much can damage a spring. Loosening a

screw too much can let a spring fall off and cause short-circuit

in the transmitter.

CAUTION: Always power off the transmitter, disconnect

and remove the battery before adjusting stick tension or

friction straps. Not doing so could result in property damage or

injury.

Control Stick Length Adjustment

1. Adjust control stick length using a 2mm Allen wrench.

2. Turn the setscrew in the stick counterclockwise to loosen it.

Make the stick shorter by turning it clockwise or longer by

turn ing it counterclockwise.

3. After adjustment of stick length, tighten the setscrew.

CHAPTER 6 PHYSICAL TRANSMITTER ADJUSTMENTS

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Spektrum DX18 - SPM18000 Manual

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