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3. Insert a new 9V alkaline battery into the battery compartment.
Observe proper battery polarity (“+” and “–”). Close the bat-
tery compartment after the battery has been installed.
Checking the EC2 Transmitter Battery
To check the battery in the EC2 transmitter, turn the transmitter
POWER switch on and observe the Battery Test light. The light
should be bright and clearly visible, indicating adequate voltage. If
it is dim, the battery voltage has dropped below 6.5 volts and the
battery should be replaced (alkaline or recharged NiCad only). If
the light does not glow at all, the transmitter will not operate and
the battery should be discarded or recharged.
EC2 Audio Gain Adjustment
The EC2 audio gain has been factory set in the LO position for
high sound pressure level (SPL) applications. For low SPL ap-
plications, the preset audio gain may be too low. If necessary, ad-
just the audio gain on the EC2 as follows:
1. Unscrew the handle and locate the audio GAIN switch adja-
cent to the battery holder. See Figure 8.
GAIN HI/LO
SWITCH
EC2 AUDIO GAIN ADJUSTMENT
FIGURE 8
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2. With the system ON and the transmitter in use, select either
the LO gain or HI gain position so that the receiver’s AUDIO
PEAK light flickers only occasionally.
NOTE: Some very loud vocalists may experience audible over-
load even when the audio GAIN switch is in the LO position. The
EC2 can be easily modified for higher SPL input. For more in-
formation, contact your dealer or the Shure Service Department.
OPERATING THE SYSTEM
1. Turn on the transmitter and receiver POWER switches.
2. Make sure the transmitter MIC ON/OFF switch is on.
3. Talk into the microphone (or play a musical instrument) and
observe the AUDIO PEAK and DIVERSITY lights on the EC4
receiver. Normal operation is indicated by:
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Steady glow of one or both DIVERSITY lights on the EC4
receiver (indicates good RF signal).
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Steady glow or flashing AUDIO NORM light (indicates good
AUDIO signal).
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Occasional flashing of the red AUDIO PEAK light.
4. Continue talking or playing into the microphone and move
around the performing area. At each location, observe the re-
ceiver display and make sure the RF signal is adequate. If the
yellow DIVERSITY lights flicker, reposition the EC4 receiver
or the WA380 antennas. The audio level should only change
when the loudness of the audio source changes; it should not
change when the microphone is moved around the perform-
ing area. Checking microphone operation in this manner will
also uncover locations that are prone to audio feedback.
IMPORTANT:
Every wireless microphone installation is unique,
and can present a variety of problems.
Never attempt a live per-
formance without a “walkthrough” first. If major changes (equip-
ment, scenery, etc.) have been made since the walk-through,
check the wireless microphone operation again—as close to
performance time as possible.
EC4 Receiver Squelch Control Adjustment
The SQUELCH control is preset for most operating conditions
and does not normally require readjustment. However, if this set-
ting needs to be changed to compensate for the effects of other
equipment in the system or for the RF conditions at the installa-
tion site, proceed as follows:
1. Place the wireless system in the location where it will be used
during a performance.
2. Turn off the transmitter POWER switch.
3. Turn the receiver VOLUME control full counterclockwise and
turn the POWER switch on.
4. Observe the lights on the receiver front panel. If the DIVERSI-
TY A or B, AUDIO NORM, or PEAK lights are glowing, the
SQUELCH control needs to be readjusted. Slowly turn the
SQUELCH control clockwise until all the lights turn off. Con-
tinue turning the SQUELCH control slightly past this point.
NOTE: Turning the SQUELCH control clockwise will prevent
unwanted signals and noise from overriding the squelch circuit
when the microphone signal is not present, but will effectively
decrease the system’s operating range.
5. To return the SQUELCH control to the factory setting, rotate it
back to the midrange (straight up) position.
EC4 Receiver Volume Control
The VOLUME control on the EC4 receiver affects both out-
puts on the rear panel. This control can be adjusted to make the
system output identical to that of a conventional wired micro-
phone, avoiding extreme differences in mixer input level set-
tings. Turning the VOLUME control counterclockwise decreases
the output level; turning it clockwise increases output.
Changing Operating Frequency
The carrier frequency of any EC Series transmitter and re-
ceiver may be changed by a factory-authorized technician.
Please contact your local dealer, sound system contractor, or the
Shure Service Department for details. The modifications require
factory training and cannot be made by the end user.
Controlling Multipath Transmission
Multipath transmission (or “dropout”) occurs when the direct
RF signal and a reflected signal arrive at the receiver at different
times or out of phase, or when the signal path is completely ob-
structed. The result is excessive noise or temporary signal loss.
To avoid this phenomenon, observe the following precautions:
•
Maintain line-of-sight transmission. Ideally, the transmitter
user should always be able to see at least one of the receiver
antennas.
•
Keep the distance between the transmitter and the receiver an-
tennas as short as possible.
•
Avoid operating the wireless microphone around reflective sur-
faces, especially metal surfaces.
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Make sure both transmitter and receiver antennas are posi-
tioned vertically.
