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L3 AND L4 RECEIVER FEATURES AND CONTROLS (Figure 3)
MODEL L3 RECEIVER
1.
POWER ON Indicator: This green LED glows when power is
turned on.
2.
RF Signal Indicator (L3 Only): Yellow light glows to show that
received RF signal exceeds squelch threshold level. This light
is not an indicatorof signal strength, although a barely flickering
light indicates marginally acceptable signals.
3.
AUDIO PEAK Indicator: Red light glows to show approaching
audio overload condition. Normal operation is shown by occa-
sional glowing of light on loud signals; constant glowing indi-
cates excessive audio level and need to lowertransmitter Audio
Level control.
4.
VOLUME Rotary Control: Determines signal level at receiver
OUTPUT connector(s). Also permits matching signal level to
input level requirements of a mixer or amplifier.
POWER On/Off Button: Applies power from the DC power in-
5.
put jack to the receiver. Green POWER light glows and remains
on when power is applied to the receiver.
DIVERSITY Signal Indicators (L4 Only): Yellow lights glow to
6.
show usable RF signals are being received from antenna A, an-
tenna B, or both.
7.
AUDIO NORMAL Indicator (L4 Only): Green light flashes,
showing normal audio operation.
Phone Jack Output Connector: ¼-inch phone jack provides
8.
unbalanced output to audio mixer or amplifier.
9.
12 VDC Negative Ground Coaxial Power Jack: Accepts pow-
er from the supplied AC adapter, or from any well-filtered 12-18
VDC supply.
10.
SQUELCH MIN-MAX Screwdriver Control: The squelch circuit
automatically quiets or "mutes" the receiver when no transmitter
signal is being received. The squelch control is factory-set for best
operation in most applications, but can be adjusted for unusual
conditions (see Receiver Squelch paragraph).
11.
XLR Output Connector (L4 Only): XLR connector provides
balanced low-impedance microphone-level output.
12.
Antenna Connector: SO-239 UHF-type connector provides
connection to ¼-wave vertical antenna.
FRONT
REAR
L3 AND L4 RECEIVERS, EXTERNAL FEATURES AND CONTROLS
FIGURE 3
MODEL L4 RECEIVER
RECEIVER SETUP
L3 and L4 Receiver Installation
1.
Place the receiver in its operating location, either on a horizontal
surface or in a rack panel (rack panel mounting brackets are
supplied with L4 receivers). If placed on a horizontal surface,
attach the four adhesive bumpers to the bottom corners of the
receiver. If installing an L4 receiver in a rack panel, remove the
screws on each side of the receiver, position the mounting
brackets supplied with the L4 over the holes, and secure the
brackets with the two removed screws and the two screws
supplied with the L4.
2.
Connect the supplied PS20 AC adapter to the POWER input
connector on the rear panel. Plug the AC adapter into a 120
VAC, 60 Hz power source.
NOTE: If the receiver is to be plugged into a 230 VAC, 50 Hz
power supply, connect the PS20E AC adapter to the POWER
input connector on the rear panel.
3.
Attach the supplied ¼-wave antennas to the ANTENNA connec-
tor(s). Make sure the antennas are pointed upward.
IMPORTANT The receiver antenna(s) should be within line-of-sight
of the transmitter. Obstructions or reflective objects will degrade sys-
tem performance. Improved L4 diversity performance may be ob-
tained by remotely locating one or both antennas so that they are
separated by 1.5 meters (60 inches) or more. Optional Shure
WA380 ½ Wave High Gain Antennas are recommended for such
applications. They may be mounted directly on the receiver or re-
motely located using two Shure WA420 Antenna Cable Kits. With
rack-mounted receivers, both antennas mustextend above the rack
cabinet or be remotely located. To operate as many as four receiv-
ers with only two antennas, use the Shure WA404 amplified Anten-
na/DC Power Distribution System.
4.
Obtain an audio cable (Shure WA410 or equivalent) with ap-
propriate connectors to connect the receiver to audio mixer or
amplifier.
NOTE: To connect the L3 output to the high-impedance input of
an audio mixer or amplifier, use a cable with ¼-inch phone
plugs on both ends.
5.
Connect the cable between the OUTPUT connector on the re-
ceiver and the mixer/amplifier input.
NOTE: When a long cable run is required, or when the mixer input
has phantom power present, add a low- to high-impedance line
matching transformer at the L3 output jack (Shure A95U or equiva-
lent). A conventional low-impedance microphone cable can then
be used between the A95U output and the mixer input.
3
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