Advantech ADAM-2000 Series User Manual page 18

1.2.3.2 Multi-path and Reflection of Signal
When the modules used in indoor place, beware of the signal reflection. The reflec-
tion can help the signal cross the obstacle. It can also generate the multi-paths which
will also cause signal attenuation. This is the reason why the transmission distance
may be reduced in indoor place.
1.2.3.3 Distance between Different Types of Modules
Following figure demonstrate the transmission distance between each type of mod-
ules. The distance between the modules with power amplifier can be around 1000m
under clear line of sight. But if the module without power amplifier is used here, the
distance will be restricted by the power of the antenna of the module. So the path will
be around 110m.
ADAM-2000 Series User Manual 8