Power System Requirements; Recommended Power System Guidelines - Spektrum DX18 Manuel D'utilisation

usually sufficient room for receiver separation. Where there is
not sufficient room, install a receiver on an external receiver
mount made of clear plastic.
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 flying. 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 flight are the number-one cause of in-flight 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
flight or for flight loads larger than ground test loads.
CAUTION:
We recommend that you DO NOT fly a model
with battery charges at less than 5.3-volts.
SPEKTRUM DX18 • TRANSMITTER INSTRUCTION MANUAL

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 significant 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.
EN
33