Spektrum SPMAR9110 - Manual (Page 13)

EN
13
Mounting the Remote Receivers
Antenna Polarization
For optimum RF link performance it’s important that the remote antennas be
mounted in an orientation that allows for the best possible signal reception
when the aircraft is at all possible attitudes and positions. This is known as
antenna polarization. This allows the greatest exposed visual cross section
of the antennas from all aircraft orientations. If three antennas are used it is
recommended that one antenna be mounted vertically, one horizontally in-
line with the fuselage and one horizontally perpendicular to the fuselage (see
illustrations on pages 11-12). This covers the X,Y and Z axis offering superb
cross section visibility in all aircraft orientations. An optional fourth antenna
can be added at an intermediate angle offering even greater RF link security
and system redundancy.
Locating the Remote Receivers
While Spektrum 2.4GHz systems are far more resistant to interference caused
from internal RF generating sources, the remote receivers should be mounted
as far away as practical (typically 4” or greater if possible) from the following:
• Ignition systems
• Ignition batteries
• Ignition switches
• Engines
• ECU’s pumps
• Electric motors
• Receiver batteries
• Fuel tanks
• Metal bypass tubes
• High-temperature
components like
exhaust systems
• Any significant
metallic conductive
components
• High-vibration areas
The remote antennas should be mounted a minimum of at least 2” apart from
each other as greater antenna separation gives improved path diversity (RF link
performance) in critical environments. In large aircraft where space is not an
issue it is highly recommended that the antennas be mounted throughout the
aircraft as illustrated. Spektrum offers remote receiver extensions ranging from
6” to 36” allowing the receivers to be mounted in the most optimum locations
throughout the aircraft. Using double-sided foam tape and tie wraps, mount
a minimum of 3 and up to four remote receivers in your aircraft as per the
illustrations and plug them into the receiver ports.
The following are illustrations of typically recommended installations.
Note the remote receiver orientation.
• 35% aerobatic plane with single NiMH battery and three remote receivers