Table of Contents
Advertisement
Frequently Asked Questions on Spektrum 2.4GHz
Your DSM2 equipped 2.4GHz system is intuitive to operate, functioning
nearly identically to FM systems. Following are a few common questions
from customers:
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 inhibit throttle output and drive all controls to preset positions
while it waits for a signal from the transmitter with the same GUID
code it has stored.
If a DSM transmitter is turned on first you can expect it to connect
within 6 seconds of powering on the receiver.
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
21
close to the receiver (within 4 feet) or near metal objects 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.
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 should a brown out occur. In addition, the
receiver's LED will flash, indicating a brown out has occurred. If after
landing you notice your DSM receiver's LED is flashing make sure
you have adequate power before you fly again.
Spektrum AR9200
Frequently Asked Questions on Spektrum 2.4GHz (continued)
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 pressing
the bind button on your transmitter when you turn it on. This will
cause the transmitter to go 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. Some transmitter stands can cause
the bind button to be depressed during power up, but these instances
are extremely rare.
If your system fails to connect, chances are much greater that it's the
result of one of the following conditions and not because the receiver
is unbound.
1. You've selected the wrong model memory.
2. The transmitter is too close to conductive material to connect
(see FAQ #2).
Spektrum AR9200
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.
22
Advertisement
Table of Contents
