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FACTS ABOUT
INFRARED TRANSMISSION SYSTEMS
The UPC-21 Infrared Transmission Systems use light emitting diodes frequency
modulated at 95kHz, the international standard.
The modulated waves radiate from the emitter panels primarily in straight lines.
Depending on the lightness of the wall color, some of this energy may be
reflected and bounce around the room. Infrared energy does not penetrate
walls. The modulated waves remain within the room where the emitter is
placed. This feature makes it perfect for use in multiplex theatre units and for
use in hotel and convention center meeting rooms and auditoriums. Additionally,
this characteristic of infrared transmission makes it ideal for meetings requiring
security of the signal.
USL, Inc. provides the following 95kHz headsets:
IRH-501 – an over-the-head receiver designed with a 360
°
pickup.
IRH-701 – an under-the-chin receiver with a 180
°
pickup.
UPC-21
I
NSTRUCTION
M
ANUAL
Ultra Stereo Labs, Inc.
