Spektrum SPMR55201 DX5e - Manual (Page 13)

13 SPEKTRUM DX5e • RADIO USER’S GUIDE
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3. If using a regulator, it’s important the above tests are
done for an extended period of 5 minutes. When current
passes through a regulator, heat is generated. This
heat causes the regulator to increase resistance, which
in turn causes even more heat to build up (thermal
runaway). While a regulator may provide adequate
power for a short duration, it’s important to test its
ability over time as the regulator may not be able to
maintain voltage at significant power levels.
4. For really large aircraft or complex models (for example
35% and larger or jets), multiple battery packs with
multiple switch harnesses are necessary or in many
cases one of the commercially available power boxes/
busses is recommended. No matter what power systems
you choose, always carry out test #1 above making sure
that the receiver is constantly provided with 4.8 volts or
more under all conditions.
5. The latest generation of Nickel-Metal Hydride batteries
incorporates a new chemistry mandated to be more
environmentally friendly. These batteries, when charged
with peak detection fast chargers, have a tendency to
false peak (not fully charge) repeatedly. These include
all brands of NiMH batteries. If using NiMH packs be
especially cautious when charging making absolutely
sure that the battery is fully charged. It is recommended
to use a charger that can display total charge capacity.
Note the number of mAh put into a discharged pack to
verify it has been charged to full capacity.
TIPS ON USING 2.4GHZ SYSTEMS
Your DSM equipped 2.4GHz system is intuitive to operate,
functioning nearly identically to FM systems. Following are
a few common questions from customers:
1. Q: After I’ve bound the receiver to my transmitter, which
do I turn on first when I want to fly?
A: Either one, unless you are using a Smart Bind
receiver such as the AR6400 or AR6400L. With a
Smart Bind receiver, the transmitter must be turned on
approximately 5 seconds before the receiver.
2. Q: Sometimes the system takes longer to connect or
doesn’t connect at all. Why?
A: In order for a DSM system to connect, the receiver
must receive a large number of uninterrupted signal
packets from the transmitter. This process takes just a
few seconds, but if the transmitter is too close to the
receiver (within 4 feet) or near reflective material (metal
objects, carbon fiber materials, tuned pipes, etc.) it may
detect its own reflected 2.4GHz energy as “noise”. This
can delay or prevent connection.
If this happens make sure you are a sufficient distance
from metal objects and the receiver itself before you
power up and try again.
3. Q: Is it true that DSM systems are less tolerant of low
voltage?
A: All DSM receivers require at least 3.5V to operate
normally. Most servos cease to operate below 3.8V.
Using multiple high-voltage servos, however, with
an inadequate power supply can allow voltage to
momentarily drop below 3.5V. This will cause the
receiver to “brown out” and reconnect.
All recently manufactured JR and Spektrum DSM
receivers feature QuickConnect technology that will
reconnect the system within a quarter of a second
after battery power recovery should a brownout occur.
For more information about Brownout Alert and
QuickConnect, please refer to the instruction manual for
your receiver.
4. Q: Sometimes when I power on my DSM system I notice
the receiver won’t connect and it needs to be rebound to
the transmitter. Can this happen in flight?
A: No. A DSM receiver cannot be unbound from its
transmitter without specific action by the user. You can
accidentally unbind a receiver by inadvertently placing
the transmitter into bind mode. If this happens and the
transmitter doesn’t detect a binding signal from the
receiver it can cause the receiver to be unbound.
5. Q: How important is it that I test my system using a
Spektrum Flight Log?