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TABLE OF CONTENTS
SAFETY INSTRUCTIONS...............................................................................2
UPC-21 FEATURES....................................................................................... 3
UPC-21 INSTALLATION................................................................................ 4
AUDIO & POWER CONNECTIONS............................................................... 5
PRELIMINARY LEVEL SETTINGS................................................................ 6
MOUNTING THE EMITTER............................................................................ 6
INSTALLATION USING TWO IRC-21S.......................................................... 8
FACTS ABOUT INFRARED TRANSMISSION SYSTEMS............................ 9
Illustrations:
UPC FEATURES........................................................................... 3
UPC-21 AUDIO, POWER CONNECTIONS.................................. 5
SUMMING RESISTOR NETWORK.............................................. 5
DIODE LIFE EXPECTANCY CHART............................................ 7
FRONT AND REAR MOUNTED VIEWS...................................... 7
INSTALLATION USING 2 IRC-21S.............................................. 8
IMPORTANT SAFETY INSTRUCTIONS
1) Read these instructions.
2) Keep these instructions.
3) Heed all warnings.
4) Follow all instructions.
5) Do not use this apparatus near water.
6) Clean only with dry cloth.
7) Do not block any ventilation openings. Install in accordance with the manufacturer’s
instructions.
8) Do not install near any heat sources such as radiators, heat registers, stoves, or other
apparatus (including amplifiers) that produce heat.
9) Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized
plug has two blades with one wider than the other. A grounding type plug has two blades
and a third grounding prong. The wide blade or the third prong are provided for your
safety. If the provided plug does not fit into your outlet, consult an electrician for replacement of the obsolete outlet.
10) Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and the point where they exit from the apparatus.
11) Only use attachments/accessories specified by the manufacturer.
12) Use only with the cart, stand, tripod, bracket, or table specified by the
manufacturer, or sold with the apparatus. When a cart is used, use caution
when moving the cart/apparatus combination to avoid injury from tip-over.
13) Unplug this apparatus during lightning storms or when unused for long periods of time.
14) Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way, such as power-supply cord or plug is damaged,
liquid has been spilled or objects have fallen into the apparatus, the apparatus has been
exposed to rain or moisture, does not operate normally, or has been dropped.
WARNING
To reduce the risk of fire or electric shock, do not expose this appliance to rain or moisture.
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1. Main Connector; consisting of the following:
a. Pins 1 & 2: DC Power Input Terminals.
Connect the output leads of the USL supplied 32VDC power
supply to pins 1 and 2. Connect the red wire to pin 1.
b. Pin 3: AC Ground Terminal.
This terminal may be connect to an earth ground connection
if required by local building codes.
c. Pin 4: Audio System Ground.
Connect to the shield of shielded-pair input cable.
d. Pin 5 & 6: Audio Input Terminals.
Balanced, differential input. Connect the two wires of a shielded
pair input cable to these terminals. If the source is unbalanced,
connect one of the wires to the shield at the source end of
the cable to minimize ground loop noise.
2. Input Range Selector.
With both switches in the upper position, the audio channel input level
range is 0.1 to 1.0 Vrms. With both switches in the lower position, the
input range is from 2 to 20 Vrms (suitable for speaker amplifier output
levels).
3. Signal Presence Indicator.
Indicates proper audio level when light blinks at the peaks of the sound.
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4. Audio Input level Adjustment.
Adjust input level so that only the peaks of the audio signal light the LED
“Signal Presence” indicator. If the LED is on constantly, the audio level
is too high and the channel is clipping.
5. Compression Slope Adjustment.
Adjusts compression from 1:1 to 3:1 with 2:1 at the approximate center
of the range. Improves intelligibility of low level dialog.
6. RF Source Switch.
Selects source of IR RF modulation to be radiated by this emitter panel.
The left switch feeds the local audio modulated RF to the emitter panel.
The right switch connects the emitter panel to an external source, such
as another IRC-21 located in another corner of the auditorium.
7. RF Input and Output BNC Connectors.
The RF Input connector accepts RF from another IRC-21 for radiation
from this emitter panel. The RF output connector feeds the modulated
RF output from this modulator to another panel.
UPC-21 Installation
Unpack the carton and verify that all materials are present.
There should be:
One system manual
One IRC-21 Emitter Panel
One IRP-20 32VDC Power Supply
One Mounting Bracket composed of 1 ea. IRBS-20 & IRBE-20
Two 10-32 x 5/8 machine screws for attaching the emitter panel to
the mounting bracket.
You will need to supply the following materials:
A small jeweler’s type flat blade screwdriver or trim pot alignment
tool for adjusting the input audio levels.
A medium flat blade screwdriver for attaching the mounting
bracket.
Shielded, two conductor audio cable for connection of the IRC-21
to the program source.
If the cord on the IRP-20 power supply is not long enough, you will
need additional #18 AWG or larger two or three conductor cable to
extend the DC output cable. If three conductor cable is used, the
third conductor can make the safety ground connection
Tools and hardware to attach the mounting bracket to the wall
One IRH-501 or IRH-701 receiver.
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CONNECT THE AUDIO INPUT LINE
Connect the center channel speaker terminals to the + and - (ground) audio
input terminals on the IRC-21 as in Fig C. If the center channel is bi-amped,
you must construct a resistor network, as in Fig. D, that sums the high and
low frequency signals, then feed the output of the network to the IRC-21 audio
input. You also may connect the IRC-21 input to the output of a monitor or a
processor.
CONNECT THE IRP-20 DC POWER PACK
Connect the provided IRP-20
DC power supply to the IRC21 power input terminals (1
and 2). If the DC supply cable
needs to be extended, refer
to table 1 for suggested wire
sizes. Make sure there are
no loose wire strands at the
terminals to avoid potential
short circuits.
DO NOT SHORT THE
POWER SUPPLY!
Connect the power supply to
an AC outlet (100 - 240VAC,
50/60Hz) using the supplied
or a standard IEC power cord.
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PRELIMINARY LEVEL SETTING
Run program material with HI audio. Set the compression slope to 2:1.
Adjust the appropriate DIP switches and input level controls to cause the audio
level LEDs to flash druing normal programming, but not to stay lit continuously.
Try listening on IR headphones. If necessary, adjust compression to bring up
low levels or reduce noise.
Note: The IRC-20 has an automatic shutoff circuit. The unit will
shut itself off after a thirty-minute absence of audio input.
When the audio resumes, the panel will switch on immediately.
Mounting the Emitter/Modulator at the front of the auditorium
(See Figures F and G) Attach the supplied mounting bracket to the wall surface
and use the supplied screws to attach the bracket to the emitter. Allow free airflow
around the emitter and be sure to have at least eight inches clearance from all
surfaces, preferably more if at all possible. The rear panel is used as a heat sink
and the heat must be allowed to dissipate. The unit should be mounted to the side
of the screen/stage area, 12 to 15 feet above the audience’s heads and pointed
downward and into the seating area.
Mounting the Emitter/Modulator at the rear of the auditorium
Attach the supplied mounting bracket to the wall surface and use the supplied
screws to attach the bracket to the emitter. Allow free airflow around the emitter
and be sure to have at least four inches clearance from all surfaces, preferrably
more. The rear panel is used as a heat sink and must be allowed to dissipate heat.
The emitter will cover up to 5,500 square feet (60 x 84 feet). The emitter is typically mounted near the projector window. The panel should be “aimed” towards the
screen. This typically results in the panel being vertical and parallel to the rear wall
of the auditorium. Aiming the panel towards the screen provides additional auditorium coverage from screen reflection.
CAUTION: The rear panel may get quite warm to the touch. This is normal.
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AN INSTALLATION USING TWO IRC-21S
Connect an IRP-20 DC power supply to each of the IRC-21s. Connect a 75
ohm coaxial cable from the RF OUT connector on the unit being driven with
audio (the master) to the RF IN connector on the slave unit. Additional slave
panels may be similarly cascaded from the first slave panel. On the master
panel, turn on the internal RF Source switch, and turn off the external RF
Source switch. On slave panels, turn on the external RF Source switch and
turn off the internal RF source switch.
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- 10 -
181 Bonetti Drive
San Luis Obispo, CA
93401
ph: 805-549-0161
fax: 805-549-0163
e-mail:usl@uslinc.com
October 29, 2012