Spectrum DX3E, Manual

12

SPEKTRUM DX3E USER GUIDE

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 use?

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 system fails to connect, the following more than 

likely may have 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 on this page)

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: 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, 

all channels will be driven to the failsafe position 

set during binding. When the transmitter is then 

turned on the transmitter scans the 2.4GHz band and 

acquires an open channel. 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 acquires 

an open channel. 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. Why?

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 

(inside or around a pit trailer, 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.

EN