Spektrum SPMAR7010 - Manual (Page 7)

7
EN
Antenna Polarization
For optimum RF link performance it’s important that the antennas be mounted in
an orientation that allows for the best possible signal reception when the aircraft is
in all possible attitudes and positions. This is known as antenna polarization. The
antennas should be oriented perpendicular to each other; typically one vertical and
one horizontal (see Receiver Installation). The remote receiver’s antenna should be
mounted in a position perpendicular at least 2 inches away from the main receiver’s
antenna using double-sided foam tape.
Receiver Installation
In gas and glow aircraft install the main receiver using the same method you would
use to install a conventional receiver in your aircraft. Typically, wrap the main
receiver in protective foam and fasten it in place using rubber bands or hook and
loop straps.
Alternately, in electric airplanes or helicopters, it’s acceptable to use thick double-
-sided foam tape to fasten the main receiver in place.
Mounting the remote receiver in a slightly different location, even just inches
away from the primary receiver, gives tremendous improvements in path diversity.
Essentially, each receiver sees a different RF environment and this is key to main-
taining a solid RF link, even in aircraft that have substantial conductive materials
(e.g. larger gas engines, carbon fiber, pipes, etc.), which can weaken the signal.
Using servo tape, mount the remote receiver keeping the remote antennas at least
2 inches away from the primary antenna. Ideally, the antennas will be oriented
perpendicularly to each other. In airplanes, we’ve found it best to mount the primary
receiver in the center of the fuselage on the servo tray and to mount the remote
receiver to the side of the fuselage or in the turtle deck.
In helicopters, there is generally enough room on the servo tray to achieve the
necessary separation. If necessary a mount can be fashioned using clear plastic to
mount the external receiver.