User's Manual

10
Avoid mounting the antenna near large metallic objects or inside
metal enclosures. Such objects can severely reduce the operating
range of the system.
When installing the FDL01TU modem in a mobile unit such as an
Automated Guided Vehicle (AGV), Futaba recommends using the
diversity receive function as a remedy for to multipath fading
problems. For diversity reception, install the two antennas as far
apart as possible in order to gain maximum benefit (Actual
recommendation is 30 cm, 6 cm at least).
The FDL01TU operates at frequencies in the 2.4 GHz band. These
frequencies are much directional than lower frequencies and are
easily reflected. If there are metal structures nearby, the effective
range may be shortened or the directional properties may be further
narrowed. To help avoid this, mount the antenna as far away as
possible from surrounding metallic structures.
Multipath problems occur easily at 2.4 GHz frequencies. When
multipath problems are present, moving the antenna as little as 10 cm
may result in improved communication or, conversely, a further
diminished or total loss of communication. Futaba recommends that
the mounting position of the antenna be determined after testing and
verifying optimal communication conditions. Negative multipath
effects can also be overcome with antenna diversity. See p.8
D
IVERSITY A NTENNA S ETUP and the related register settings for
more details regarding antenna diversity.
2.4.3 Multiple FDL Modems Installation Precautions
When installing multiple FDL (series) modem systems that will use
different frequency groups in the same area, modem’s antennas of
different frequency groups must be mounted at least 6 feet (2
meters) apart. Failure to do so may severely reduce the modem
operating range.
Please contact Futaba for information about antenna separation when
using the FDL01TU and other wireless products in the same area.
WARNING
CAUTION
CAUTION
CAUTION