23
2.5.3 Wiring between IR receiver unit and main unit when using distributors
If the input signals of each IR receiver unit are not in the same phase, the receiving level
may decrease. To match the signal phase, the length of the corresponding cables and
should be the same; main unit and distributor RF terminals can not be vacant.
Cable length to the IR receiver unit L1=L2+L3+M1
Difference in length among L1, L2+L3+M1 should be /-3 meters
Distance from IR receiver unit to IR main unit should be less than 100 meters or more
than 2 meters L1=L2+L3+L4≤100M
L1=L2+L3+L4≥2M
2.5.4 Caution item
a. Infrared operating distance varies depending on the color of the ceiling and walls.
b. Noise may be generated by interference regardless of the operating distance between
the IR receiver unit and the microphone unit; in this case, move receiver unit away
from infrared-emitting objects.
c. Do not place any obstructions around the microphone units.
d. Block direct sunlight from the unit using curtains or blinds.
e. When installing the IR receiver units on the ceiling, install the units at least 2 to 3
meters away from the windows or the wall.
f. Install the IR receiver units more than 50cm from fluorescent lamps.
g. In addition, if the IR receiver units are installed near the infrared-emitting sources list
below, the system may malfunction or noise may be generated. When installing the IR
receiver units, and the microphone units, take care to avoid placing them near the
following infrared-emitting and noise sources:
Lighting equipment
Projector (liquid crystal, DLP), OHP, incandescent bulbs
Mercury lamp, halogen lamps, and inverter fluorescent lamps
Plasma displays
Infrared devices such as the remote control, infrared microphones and infrared LAN
Dimmer controls
