Spektrum SPMAR12020 User Manual

Page 7

Patented MultiLink

™

Receiver Technology

The AR12020 includes four receivers, offering the security of multiple path RF

redundancy. An internal receiver is located on the main receiver, while three

required external receivers are attached to the main board with a 6-inch, 12-inch,

and 24-inch extension. Locating these receivers in slightly different locations in the

aircraft, exposes each receiver to its own RF environment. This greatly improves

the receiver’s ability to see the signal in all conditions.

Antenna Polarization

For optimum RF link performance mount the antennas in an orientation that allows

for the best possible signal reception when the aircraft is in all possible attitudes

and positions. Orient the antennas perpendicular to each other; typically one

vertical and one horizontal (see Receiver Installation). Mount the remote receiver’s

antenna perpendicular at least 2 inches away from the main receiver’s antenna

using double-sided foam tape.

Receiver Installation

Mount each remote receiver at least 2 inches away from the primary antenna.

Ideally, you should position the antennas perpendicular to each other. This gives

tremendous improvements in path diversity as each receiver can „see“ a different

RF environment. This is key to maintaining a solid RF link, especially in aircraft

that have substantial conductive materials (e.g., larger gas engines, carbon fiber,

pipes, etc.), which can weaken the signal. In airplanes, we recommend mounting

the primary receiver in the center of the fuselage on the servo tray and the remote

receivers on the side of the fuselage or in the turtle deck.

X-Plus 8 Module 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 connecting an X-Plus receiver and module, mount them near each other to

minimize current loss. If servo extensions are needed, we recommend using heavy

22 gauge wire with gold-plated connectors.

Auxiliary batteries can be used to support the servos connected to the X-Plus mo-

dule. However, if 1 or 2 auxiliary batteries are connected, never use a jumper plug

in addition to an auxiliary battery. This may damage the module or the receiver. If

no auxiliary batteries are used, install a jumper plug in a BATT/JMPR port.

X+1

X+5

X+6

X+2

X+3

X+7

X+8

BATT/JMPR

SRXL

X+4