EN
position 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 acquires two open channels. 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 two
open channels. (When the receiver is then turned on, for a short period (the time it takes to
connect) all servos except for the throttle are driven to their preset failsafe positions while the
throttle has no output pulse.) The receiver scans the 2.4GHz band looking for the previously
stored GUID and 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 consecutive uninterrupted perfect packets from the transmitter in order to connect.
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 ft.) or if the
transmitter is located near metal objects (metal TX case, the bed of a truck, the top of a metal
work bench, etc.) connection will take longer and 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 again will cause a connection to occur. This only happens
during the initial connection. Once connected the system is locked in 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 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 thus 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 startup process of scanning the band
and finding the transmitter) and this can take several seconds. Please read the receiver power
requirement section as this explains how to test for and prevent this occurrence.
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 transmitter is placed
into bind mode, 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 DX7
customers that use transmitter stands or trays that unknowingly depress the bind button and the
system is then turned on losing the necessary information to allow the connection to take place.
We’ve also had DX7 customers that didn’t fully understand the range test process and pushed
the bind button before turning on the transmitter also causing the system to “lose its bind.”
Warranty Period
Exclusive Warranty- Horizon Hobby, Inc., (Horizon) warranties that the Products purchased (the “Product”)
will be free from defects in materials and workmanship for a period of 1 (one) year from the date of
purchase by the Purchaser.
1 Year Limited Warranty
Horizon reserves the right to change or modify this warranty without notice and disclaims
all other warranties, express or implied.
