Specifications - Spektrum DX20 Instruction Manual

x-PLUS™ MODULE
The X-Plus™ 8 module is designed to allow expansion of up to
8 servos for non-control surface functions such as bomb drops,
lights, winches, retractable landing gear, and many more. The
X-Plus 8 is compatible with Spektrum™ X-Plus transmitters and
receivers. The X-Plus 8 module offers the option to power the
connected servos via dual auxiliary battery ports with separate
batteries and switch harnesses (sold separately) independent of
the receiver. The X-Plus 8 module can also be powered inclusive
of the receiver by using the included jumper through either of the
dual BATT/JMPR ports.
Features:
• 8-channel expansion
• Dual battery ports
• Included Jumper offers option of using receiver power
• Allows fine tuning of 8 servos on non-critical controls (bomb
drops, lights, winches, gear, etc.)
Applications
Scale modelers with complex aircraft, ships, or surface applica-
tions will enjoy the easy programming and functions of the X-Plus
8 module using X-Plus compatible transmitter's AirWare™
software. Modelers will be able to select 2 position,
Installation
In gas and glow aircraft, install the X-Plus 8 module by wrapping it
in protective foam and fastening it in place using rubber bands or a
hook and loop strap. In electric airplanes or helicopters, you can use
thick double-sided foam tape to fasten the module in place.
When using an X-Plus receiver and module, it is recommended that
the X-Plus 8 module be mounted as near to the receiver as possible.
When using the jumper lead to power the module, mounting the
X-Plus 8 module near the receiver system will minimize the current
loss from the receiver. Servo extensions can be used with each
servo, but we recommend using heavy 22 gauge wire with gold-
plated connectors.
A power jumper plug must be installed in one of the BATT/JMPR
ports of the module if the module is powered from the receiver
through the SRXL port.
Always remove the power jumper when an auxiliary battery or auxil-
iary batteries are used. When the auxiliary battery option is used, the
X-Plus 8 module can be mounted as far away from the receiver as
needed to be near connected servos.
Power System Requirements
Inadequate power systems that do not provide the necessary mini-
mum voltage to the receiver during flight are 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 X-Plus 8 module has a minimum operational voltage of 3.5
volts; it is highly recommended that the power system be tested per
the guidelines.
CAUTION: Only use the included Jumpers with the X-Plus
8 module. Do not use Bind Plugs for the Jumpers.
SPEKTRUM DX20 • TRANSMITTER INSTRUCTION MANUAL
3 position or potentiometer adjustment through their transmitter.
After selecting the specific switch or port, AirWare software will al-
low the individual servo adjustment of each X-Plus channel's travel
adjust, sub trim, reversing, and speed.

Specifications

Type: X-Plus Module
Channels: 8
Dimensions: 0 .91x 1.61 x 0.79 in
(23 x 41 x 20mm)
Weight: .42 oz (11.9 g)
Voltage Range: 3.5 to 9.6V
Resolution: 512
Compatibility: A ll X-Plus transmitters and receivers
X+1
X+2
X+3
X+4
X+5
X+6
Recommended Power System Test Guidelines
If a questionable power system is being used (e.g., a small or old
battery, an ESC that may not have a BEC that will support high-
current draw, etc.), perform the following test with a voltmeter.
The Hangar 9 Digital Servo & Rx Current Meter (HAN172) or the
®
Spektrum Flight Log (SPM9540) work well for this test.
Plug the voltmeter into an open channel port in the receiver and, with
the system on, 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.
CAUTION: When charging Ni-MH batteries, make sure the
battery fully charges. Ni-MH batteries charged with peak
detection fast chargers have a tendency to false peak (i.e. not fully
charge), which could lead to a crash.
X+6 Servo X+5 Servo X+4 Servo X+3 Servo X+2 Servo X+1 Servo
To SRXL Port
Auxiliary Battery
Pack
Jumper
(optional)
On/Off Switch Harness (optional)
EN
X+7
X+8
BATT/JMPR
BATT/JMPR
SRXL
X+8 Servo X+9 Servo
13