Spektrum SPMR55001 DX5e Manual - Manual (Page 13)

13 SPEKTRUM DX5e • RADIO USER’S GUIDE
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3. Q: I’ve heard that the DSM system is less tolerant of low
voltage. Is this correct?
A: All DSM receivers have an operational voltage range of
3.5 to 9 volts. With most systems this is not a problem
as in fact most servos cease to operate at around 3.8
volts. When using multiple high-current draw servos
with a single or inadequate battery/ power source, heavy
momentary loads can cause the voltage to dip below
this 3.5-volt threshold causing the entire system (servos
and receiver) to brown out. When the voltage drops
below the low voltage threshold (3.5 volts), the DSM
receiver must reboot (go through the start-up process of
scanning the band and finding the transmitter) and this
can take several seconds.
4. Q: Sometimes my receiver loses its bind and won’t
connect, requiring rebinding. What happens if the bind
is lost in flight?
A: The receiver will never lose its bind unless it’s instructed
to. It’s important to understand that during the binding
process the receiver not only learns the GUID (code) of
the transmitter but the transmitter learns and stores the
type of receiver that it’s bound to. If the trainer switch is
pulled on the transmitter at any time and the transmitter
is turned on, the transmitter looks for the binding
protocol signal from a receiver. If no signal is present,
the transmitter no longer has the correct information
to connect to a specific receiver and in essence the
transmitter has been “unbound” from the receiver. We’ve
had several customers using transmitter stands or trays
that unknowingly depress the bind button. The system
is then turned on, losing the necessary information
to allow the connection to take place. We’ve also had
customers that didn’t fully understand the range test
process and pulled the trainer switch before turning
on the transmitter, also causing the system to “lose its
bind.” If the system fails to connect, one of the following
has occurred:
• The transmitter is near conductive material (transmitter
case, truck bed, etc.) and the reflected 2.4GHz energy is
preventing the system from connecting. (See #2 above)
• The trainer switch was pulled and the radio was
previously turned on knowingly (or unknowingly),
causing the transmitter to no longer recognize the
receiver.
GENERAL INFORMATION
FCC Information
This device complies with part 15 of the FCC rules.
Operation is subject to the following two conditions: (1)
This device may not cause harmful interference, and (2)
this device must accept any interference received, including
interference that may cause undesired operation.
Caution: Changes or modifications not expressly
approved by the party responsible for compliance could
void the user’s authority to operate the equipment.
This product contains a radio transmitter with wireless
technology which has been tested and found to be compliant
with the applicable regulations governing a radio transmitter
in the 2.400GHz to 2.4835GHz frequency range.
Servo Precautions
• Do not lubricate servo gears or motors.
• Do not overload retract servos during retracted or
extended conditions. Make sure they are able to
travel their full deflection. Overloading or stalling a
servo can cause excessive current drain.
• Make sure all servos move freely through their
rotations and no linkages hang up or bind. A binding
control linkage can cause a servo to draw excessive
current. A stalled servo can drain a battery pack in a
matter of minutes.
• Correct any control surface “buzz” or “flutter” as soon
as it is noticed in flight, as this condition can destroy
the feedback potentiometer in the servo. It may be
extremely dangerous to ignore such “buzz” or “flutter.”
• Use the supplied rubber grommets and brass servo
eyelets when mounting your servos. Do not over-
tighten the servo mounting screws, as this negates the
dampening effect of the rubber grommets.
• Ensure the servo horn is securely fastened to the servo.
Use only the servo arm screws provided; the size is
different from other manufacturers.
• Discontinue to use servo arms when they become
“yellowed” or discolored. Such servo arms may be
brittle and can snap at any time, possibly causing the
aircraft to crash.
• Check all related mounting screws and linkages
frequently. Aircraft often vibrate, causing linkages and
screws to loosen.