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35SPEKTRUM DX18 • TRANSMITTER INSTRUCTION MANUAL
EN
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
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
35


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