Spektrum SPMAR6260 - Manual (Page 14)

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EN
Tips on Using Spektrum 2.4GHz
While your DSM equipped 2.4GHz system is intuitive to operate, functioning
nearly identically to 72MHz systems, following are a few common questions
from customers.
1. Q: Which do I turn on first, the transmitter or the receiver?
A: It doesn’t matter, although it is suggested to turn the transmitter on first.
If the receiver is turned on first, the throttle channel doesn’t put out a
pulse position at this time, preventing the arming of electronic speed
controllers, or in the case of an engine powered aircraft, the throttle
servo remains in its current position. When the transmitter is then turned
on the transmitter scans the 2.4GHz band and DSM2 systems will
acquire two open channels while DSMX systems will begin transmission
after being turned on. Then the receiver that was previously bound to the
transmitter scans the band and finds the GUID (Globally Unique Identifier
code) stored during binding. The system then connects and operates
normally. If the transmitter is turned on first, the transmitter scans the
2.4GHz band and DSM2 systems acquire two open channels while DSMX
systems will simply begin transmission. When the receiver is turned on,
the receiver scans the 2.4GHz band looking for the previously stored
GUID. When it locates the specific GUID code and confirms uncorrupted
repeatable packet information, the system connects and normal
operation takes place. Typically this takes 2 to 6 seconds.
2. Q: Sometimes the system takes longer to connect and sometimes it
doesn’t connect at all?
A: In order for the system to connect (after the receiver is bound), the
receiver must receive a large number of continuous (one after the other)
uninterrupted perfect packets from the transmitter. This process is
purposely critical of the environment ensuring that it’s safe to fly when
the system does connect. If the transmitter is too close to the receiver
(less than 4 feet) or if the transmitter is located near metal objects (metal
transmitter case, the bed of a truck, the top of a metal work bench, etc.)
connection will take longer. In some cases connection will not occur
as the system is receiving reflected 2.4GHz energy from itself and is
interpreting this as unfriendly noise. Moving the system away from metal
objects or moving the transmitter away from the receiver and powering
the system up again will cause a connection to occur. This only happens
during the initial connection. Once connected the system is locked, and
should a loss of signal occur (failsafe), the system connects immediately
(4ms) when signal is regained.
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 9.6 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 highcurrent 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