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WIR TX75 C/D Infrared Transmitter
System Overview
The WIR TX75 C/D PRO is a two-channel PRO infrared transmitter combining infrared modulator and emitter technology into a
single mountable enclosure—which reduces operating costs, eliminates the need for rack space and eases set-up.
The WIR TX75
C
PRO Infrared Transmitter includes phoenix connectors for the line inputs and provides two channels: 2.3 MHz
and 2.8 MHz.
The WIR TX75
D
PRO Infrared Transmitter includes phoenix connectors for the line inputs and provides two channels: 3.3 MHz
and 3.8 MHz.
The WIR TX75 C/D PRO is ideal for high-quality audio programs such as music, theater and audio description. The WIR TX75
C/D PRO will accept any line level, balanced or unbalanced audio inputs. Infrared receivers detect the transmission and convert
the light signals back into audio signals. The WIR TX75 C/D PRO operating frequencies (2.3,2.8 / 3.3,3.8 MHz) minimize high-
efficiency lighting interference.
Up to two slave emitters can be added for additional coverage. Power, baseband, and digital data are fed to the slave emitters via
a single CAT-5e cable for each emitter. No additional cables are required.
No FCC license or radio approval is required with this equipment. It can be used anywhere in the world.
NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15
of the FCC Rules� These limits are designed to provide reasonable protection against harmful interference when the
equipment is operated in a commercial environment� This equipment generates, uses, and can radiate radio frequency
energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to
radio communications� Operation of this equipment in a residential area may cause interference in which case the user
will be required to correct the interference at his own expense�
NOTE: A PLASMA MONITOR OR TELEVISION CAN DEGRADE THE AUDIO QUALITY OF THE WIR TX75 C/D PRO
TRANSMITTER� FOR BEST PERFORMANCE, THE TRANSMITTER SHOULD BE POSITIONED AS FAR AWAY AS
POSSIBLE FROM ANY PLASMA MONITOR OR TELEVISION�
Installation Procedures
Determine Coverage Area
When using the WIR TX75 C/D PRO transmitter in single-channel mode with the RX22-4 receiver, the system coverage area will
exceed 12,000 sq. ft. (1,115 sq. m.). WIR TX75 C/D PRO units automatically adjust to give the best coverage area possible in
both 1-channel and 2-channel modes.
Figure 1 illustrates typical coverage pattern for the WIR TX75 C/D PRO. This can be affected by direct/indirect sunlight, reflections
on walls and room construction. Reflections of the infrared light from walls, ceilings, and floors may change these patterns.
Important: Remember to point the transmitter towards the listening audience.
Remember: Most objects block infrared light. The transmitter cannot be concealed behind walls, glass, curtains, etc.
These patterns are the direct radiation pattern. The infrared radiation does not drop to zero outside the illustrated patterns; it
decreases. It still may be useable at a greater distance, depending on the receiver sensitivity and the reflective characteristics of
the room. Reflections of the infrared light from walls, ceilings, and floors may change these patterns.
The WIR TX75 C/D PRO can be operated with or without the faceplate, if desired. The faceplate can be removed and painted to
match room decor. Lightly sand faceplate with 400 grit sandpaper apply primer and two coats of final color.
Do not paint the
infrared lens behind the faceplate of the WIR TX75 C/D PRO.
