Spektrum SPMAR7600 - Manual (Page 3)

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.
Q: Which do I turn on first, the transmitter or the receiver?
A: If the receiver is turned off first—all servos except for the throttle will be driven to their
preset failsafe positions set during binding. At this time the throttle channel doesn’t output a
pulse position preventing the arming of electronic speed controllers or in the case of an engine
powered aircraft the throttle servo remaining 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.
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 feet) 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.
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 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 start-up 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.
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 year from the date of purchase by
the Purchaser.
Limited Warranty
(a) This warranty is limited to the original Purchaser (“Purchaser”) and is not transferable. REPAIR
OR REPLACEMENT AS PROVIDED UNDER THIS WARRANTY IS THE EXCLUSIVE REMEDY OF THE
PURCHASER. This warranty covers only those Products purchased from an authorized Horizon dealer.
Third party transactions are not covered by this warranty. Proof of purchase is required for warranty claims.
Further, Horizon reserves the right to change or modify this warranty without notice and disclaims all other
warranties, express or implied.
(b) Limitations- HORIZON MAKES NO WARRANTY OR REPRESENTATION, EXPRESS OR IMPLIED,
ABOUT NON-INFRINGEMENT, MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OF THE
PRODUCT. THE PURCHASER ACKNOWLEDGES THAT THEY ALONE HAVE DETERMINED THAT THE
PRODUCT WILL SUITABLY MEET THE REQUIREMENTS OF THE PURCHASER’S INTENDED USE.
(c) Purchaser Remedy- Horizon’s sole obligation hereunder shall be that Horizon will, at its option, (i)
repair or (ii) replace, any Product determined by Horizon to be defective. In the event of a defect, these are
the Purchaser’s exclusive remedies. Horizon reserves the right to inspect any and all equipment involved
in a warranty claim. Repair or replacement decisions are at the sole discretion of Horizon. This warranty
does not cover cosmetic damage or damage due to acts of God, accident, misuse, abuse, negligence,
commercial use, or modification of or to any part of the Product. This warranty does not cover damage due
to improper installation, operation, maintenance, or attempted repair by anyone other than Horizon. Return
of any goods by Purchaser must be approved in writing by Horizon before shipment.
Damage Limits
HORIZON SHALL NOT BE LIABLE FOR SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES, LOSS OF
PROFITS OR PRODUCTION OR COMMERCIAL LOSS IN ANY WAY CONNECTED WITH THE PRODUCT,
WHETHER SUCH CLAIM IS BASED IN CONTRACT, WARRANTY, NEGLIGENCE, OR STRICT LIABILITY.
Further, in no event shall the liability of Horizon exceed the individual price of the Product on which liability
is asserted. As Horizon has no control over use, setup, final assembly, modification or misuse, no liability
shall be assumed nor accepted for any resulting damage or injury. By the act of use, setup or assembly, the
user accepts all resulting liability.
If you as the Purchaser or user are not prepared to accept the liability associated with the use of this
Product, you are advised to return this Product immediately in new and unused condition to the place of
purchase.
Law: These Terms are governed by Illinois law (without regard to conflict of law principals).
Safety Precautions
This is a sophisticated hobby Product and not a toy. It must be operated with caution and common sense
and requires some basic mechanical ability. Failure to operate this Product in a safe and responsible
manner could result in injury or damage to the Product or other property. This Product is not intended
for use by children without direct adult supervision. The Product manual contains instructions for safety,
operation and maintenance. It is essential to read and follow all the instructions and warnings in the
manual, prior to assembly, setup or use, in order to operate correctly and avoid damage or injury.
Questions, Assistance, and Repairs
Your local hobby store and/or place of purchase cannot provide warranty support or repair. Once assembly,
setup or use of the Product has been started, you must contact Horizon directly. This will enable Horizon to
better answer your questions and service you in the event that you may need any assistance. For questions
or assistance, please direct your email to [email protected], or call 877.504.0233 toll
free to speak to a Product Support representative.
Inspection or Repairs
If this Product needs to be inspected or repaired, please call for a Return Merchandise Authorization (RMA).
Pack the Product securely using a shipping carton. Please note that original boxes may be included, but
are not designed to withstand the rigors of shipping without additional protection. Ship via a carrier that
provides tracking and insurance for lost or damaged parcels, as Horizon is not responsible for merchandise
until it arrives and is accepted at our facility. A Service Repair Request is available at www.horizonhobby.
com on the “Support” tab. If you do not have internet access, please include a letter with your complete
name, street address, email address and phone number where you can be reached during business days,