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Frequently Asked Questions on Spektrum 2.4GHz
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. Every DSM 2.4GHz transmitter has a GUID (Globally Unique
Identifier) code imbedded in its signal. When you bind a DSM receiver
to your transmitter, this GUID code is stored in the receiver. If you turn
the receiver on before the transmitter, you don’t have to worry about it
responding to another transmitter. The receiver will go into failsafe mode
while it waits for a signal from the transmitter with the same GUID code
it has stored. See the Receiver Power Only section for more information.
If a DSM transmitter is turned on first you can expect it to connect within
6 seconds of powering on 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
material, 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 with an
inadequate power supply can allow voltage to momentarily drop below
3.5V. This will cause the receiver to “brown out” and reconnect. See the
QuickConnect with Brownout Detection section for more information.
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.
5. Q: How important is it that I test my system using a Spektrum
Flight Log?
A: All 2.4GHz signals, not just DSM, are affected by proximity to
conductive materials such as carbon fiber or metal. Few RTF and
ARF sport airplanes or helicopters use enough of these kinds of
materials for it to be an issue. If, however, you’re flying a sophisticated
model that uses a lot of conductive materials in its construction, a Flight
Log can be helpful. The information it collects when you fly will help you
determine the optimum location for your receiver(s) so you can minimize
the effects of these materials on your signal performance. For more
details on the Flight Log and how it works, visit SpektrumRC.com.