3
EC4 RECEIVER CONTROLS AND INDICATORS
(FIGURE 3)
10
8
9
7
5
4
3
1
2
7
EC4 RECEIVER FEATURES AND CONTROLS
FIGURE 3
6
1. POWER ON Indicator: This green light glows when the
POWER button is turned on.
2. DIVERSITY Signal Indicators: Yellow lighs glow to show us-
able RF signals from antenna A, antenna B, or both. Normal
operation is indicated when either or both lights glow. Note that
these lights are
not indicators of signal strength, but barely
flickering lights may indicate marginally acceptable signals.
3. AUDIO NORMAL Indicator: This green light flashes regular-
ly to show normal audio operation.
4. AUDIO PEAK Indicator: This light glows red to show ap-
proaching audio overload condition. Normal operation will
cause occasional flashing of this light on loud signals; constant
glowing indicates excessive audio level and need to lower
transmitter Audio Gain switch or rotary control.
5. VOLUME Rotary Control: Determines signal level at both re-
ceiver OUTPUT connectors.
6. POWER On/Off Button: Applies power from the DC power in-
put jack to the receiver circuitry. The green POWER light glows
and remains on when power is applied to the receiver.
7. ANTENNA Connectors: UHF type connectors provide con-
nection to
1
/
4
-wave vertical antennas supplied with the EC4, to
the coaxial cable in the optional WA420 Antenna Cable Kit, or
to the optional
1
/
2
-wave high-gain antennas (WA380).
8. 12 VDC Negative Ground Coaxial POWER Jack: Accepts
power from the supplied ac adapter, or from any well filtered
12.5 to 18 Vdc (200 mA) power supply.
9. SQUELCH Screwdriver Control: Automatically quiets or
“mutes” the receiver when no transmitter signal is received.
This control is factory-set for optimum operation in most
applications, but can be adjusted for unusual conditions. See
the “EC4 Receiver Squelch Control Adjustment” paragraph.
10. OUTPUT Connectors: XLR connector provides balanced low
impedance microphone-level output;
1
/
4
-inch phone jack pro-
vides unbalanced auxiliary level output to audio mixer or amplifier.
PRE-INSTALLATION REQUIREMENTS
Before attempting to install the EC wireless microphone sys-
tem, make sure you have the following items:
•
A 9V alkaline battery for the transmitter (Duracell MN1604 or
equivalent). A rechargeable, heavy duty 8.4V nickel-cadmium
(NiCad) battery may also be used.
•
A microphone for the EC1 transmitter—either one designed
specifically for the transmitter (such as a Shure WL84 or
WL93), or a low impedance dynamic microphone with a micro-
phone adapter cable WA310. If the system is to be connected
to the electrical output of a musical instrument, an instrument
cable such as the Shure WA302 must be used.
IMPORTANT: Other manufacturer’s microphones specified for
wireless use are generally
not compatible, as supplied, with
Shure wireless systems.
•
A receiver-to-mixer cable with a 3-pin XLR connector (for bal-
anced microphone level EC4 receiver output), or 1/4-inch 2-cir-
cuit phone plug on one end (for unbalanced auxiliary level EC4
receiver output), and a mixer input connector on the other.
EC4 RECEIVER SETUP AND CONNECTIONS
1. Place the receiver in its operating position. Avoid placing the re-
ceiver near RF noise sources such as light dimmers, computers
and other digital devices (e.g., CD players and digital delays).
2. If the receiver is placed on a horizontal surface, attach the four
adhesive bumpers to the bottom corners of the receiver. If the
receiver is to be rack mounted, remove the screws on each
side of the receiver case, position the mounting brackets over
the holes, and secure the brackets with the two removed
screws and the two supplied screws.
3. Plug the AC adapter into the POWER jack on the rear panel of
the receiver.
4. Plug the AC adapter into a 120V, 60 Hz power source.
5. Attach the supplied
1
/
4
-wave antennas to the ANTENNA con-
nectors on the receiver. Make sure they are pointing up and
are within the line of sight of the transmitter. Obstructions or re-
flecting objects will degrade system performance.
6. Attach the audio connecting cable with an XLR connector or a
1
/
4
-inch phone plug on the receiver end between the desired
EC4 OUTPUT connector and the mixer or amplifier input.
IMPORTANT: Improved diversity receiver performance may be
obtained by remotely locating one or both antennas so that they
are separated by 1.5 meters (60 inches) or more. Optional Shure
WA380
1
/
2
-Wave High-Gain Antennas are recommended for this
application. They may be remotely located using one or two Shure
WA420 Antenna Cable Kits. If the receiver is to be rack mounted,
both antennas
must be remotely located or mounted on the front
of the rack using the Shure WA440 accessory rack-mount kit. To
operate up to four receivers with only two antennas, use the Shure
WA404 amplified Antenna/DC Power Distribution System.
Transmitter Battery Selection
Only two types of batteries are recommended for use with the
EC1 and EC2 transmitters:
•
9V alkaline batteries (Duracell MN1604 or equivalent).A fresh
9V alkaline battery should provide 7 hours of operation.
•
Rechargeable, heavy duty 8.4V nickel-cadmium (NiCad) batter-
ies. NiCad batteries will only provide 1.5 to 2 hours of operation.
IMPORTANT: Use only a 9V alkaline battery or a heavy-duty, re-
chargeable 8.4V NiCad battery. Carbon–zinc and zinc-chloride
batteries will not provide sufficient power for proper operation,
and are not recommended.
EC1 TRANSMITTER SETUP
EC1 Transmitter Battery Installation
1. With the transmitter POWER ON/OFF switch in the OFF posi-
tion, slide the battery compartment access cover toward the
OPEN arrow until the cover pivots open. See Figure 4 below.
