USL IRC-21 User Manual
Page 4
- 3 -
- 8 -
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, dif
ferential 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 V
rms. With both switches in the lower position, the
input range is from 2 to 20 V
rms (suitable for speaker amplifier output
levels).
3. Signal Presence Indicator
.
Indicates proper audio level when light blinks at the peaks of the sound.
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 of
f the external RF
Source switch. On slave panels, turn on the external RF Source switch and
turn of
f the internal RF source switch.
AN INST
ALLA
TION USING TWO IRC-21S