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Important: Y-Harnesses and Servo Extensions
When using a Y-harness or servo extensions in your installation, it’s important
to use standard non-amplified Y-harnesses and servo extensions as this can/
will cause the servos to operate erratically or not function at all. Amplified
Y-harnesses were developed several years ago to boost the signal for some
older PCM systems and should not be used with Spektrum equipment.
Note that when converting an existing model to Spektrum be certain that all
amplified Y-harnesses and/or servo extensions are replaced with conventional
non-amplified versions.
Receiver Power System Requirements
Inadequate power systems that are unable to provide the necessary minimum
voltage to the receiver during flight have become the number one cause of
in-flight failures. Some of the power system components that affect the ability
to properly deliver adequate power include:
• Receiver battery pack (number of cells, capacity, cell type, state of charge)
• The ESC’s capability to deliver current to the receiver in electric aircraft
• The switch harness, battery leads, servo leads, regulators etc.
The AR9140T/AR12310T/AR20310T have a minimum operational voltage
of 3.5 volts; it is highly recommended the power system be tested per the
guidelines below.
Power System Test Guidelines
If a questionable power system is being used (e.g. small or old battery,
ESC that may not have a BEC that will support high-current draw, etc.), it is
recommended that a voltmeter be used to perform the following tests.
The Hangar 9
®
Digital Servo & Rx Current Meter (HAN172) or the Spektrum
Flight Log (SPM9540) is the perfect tool to perform the test below.
Plug the voltmeter into an open channel port in the receiver and with the
system on, or simply monitor the voltage on a telemetry capable transmitter,
load the control surfaces (apply pressure with your hand) while monitoring the
voltage at the receiver. The voltage should remain above 4.8 volts even when
all servos are heavily loaded.
How QuickConnect
™
Techonlogy Works
• When the receiver voltage drops below 3.5 volts the system ceases to operate.
• When power is restored the receiver immediately attempts to reconnect.
• If the transmitter was left on, the system reconnects typically in about
4/100 of a second.
NOTICE:
If a brownout occurs in flight it is vital that the cause of the
brownout be determined and corrected.
