6
TROUBLESHOOTING
If the installation and setup instructions have been followed and
a problem still exists, perform the troubleshooting procedures in
the table below. If the problem persists, contact your dealer or the
Shure Service Department.
PROBLEM
SOLUTION
No receiver sound;
neither DIVERSITY
light on receiver is
glowing
Make sure POWER switch on transmitter and receiver is ON (Both green LEDs are illuminated).
Check transmitter battery and receiver power source.
Check receiver squelch setting.
Check receiver antenna connections.
Make sure transmitter and receiver are on same operating frequency.
Make sure transmitter and receiver antennas follow line of sight. If necessary, reduce the distance between the
transmitter and the receiver. Higher gain antennas (WA380) may be required.
No receiver sound;
one or both DIVER-
SITY lights are glow-
ing
With the microphone POWER switch ON, turn up the receiver volume control.
Make sure transmitter MIC switch is ON.
Check transmitter microphone MUTE switch.
Make sure microphone cable plug is locked into transmitter connector.
Check connection between receiver and microphone mixer.
Talk into the microphone and observe the receiver AUDIO light. If the light is glowing, the problem is elsewhere
in sound system.
Noise from receiver
with transmitter off; DI-
VERSITY lights on re-
ceiver glow or flicker
Look for strong local interference sources such as other radio signals. (Nearby motors or lighting equipment
could also be the problem.) Reposition antennas.
SQUELCH control may be set too low. Readjust as necessary.
Received signal is
noisy or contains ex-
traneous sounds with
transmitter on
Look for strong local interference sources such as other radio signals, nearby motors or lighting equipment.
Remove the source of interference, reposition the receiver, or reposition the antennas.
Two transmitters may be operating on the same frequency. Locate and turn one off.
Signal may be too weak. Reposition antennas. If possible, move them closer to the transmitter. Optional
1
/
2
wave
high gain antennas (WA380) and antenna cable kit (WA420) are available
SQUELCH control may be set too low. Readjust as necessary.
SPECIFICATIONS
OVERALL SYSTEM
RF Carrier Frequency Range
169.445 MHz to 216.100 MHz
Frequency Stability
±
32.5 ppm,
±
5.5 kHz (Complies with FCC regulations)
Working Range (average conditions)
600 feet (182.8 m) at 50 mW
Modulation
±
15 kHz deviation compressor-expander system with pre- and
de-emphasis
Total Harmonic Distortion (ref.
±
15 kHz deviation, 1 kHz modu-
lation)
0.4% typical, 0.7% maximum
Dynamic Range
>102 dB A-weighted
Audio Frequency Response
80 to 15,000 Hz,
±
2 dB (NOTE: Overall system response de-
pends on microphone element; refer to microphone frequency
response curves on page 8)
Operating Temperature Range
–4
°
to 122
°
F (–20
°
to 50
°
C)
EC4 RECEIVER
RF Sensitivity
0.45
µ
V for 12 dB SINAD typical
Image Rejection
90 dB typical
Spurious Rejection
80 dB typical
Ultimate Quieting (reference 15 kHz deviation)
>94 dB A-weighted
Squelch Quieting (reference 15 kHz deviation)
>94 dB A-weighted
Squelch Threshold
2.0
µ
V preset, adjustable from 2.0 t
ο 50 µ
V
Output
–2 dBV, 1 k
Ω
output impedance, unbalanced; –18 dBV, 150
Ω
output impedance, balanced (volume full clockwise; full devi-
ation; unloaded)
Antenna Input Impedance
50
Ω
nominal
Antenna
Plastic sheathed stainless steel,
1
/
4
wavelength, 428 mm,
PL-259 UHF connectors
Power Requirements
12.5 to 18 VDC (negative ground), 200 mA;120 Vac, 60 Hz
Model PS20 external AC adapter supplied (Model PS20E
220/240 Vac, 50/60 Hz available optional)
Overall Dimensions
1.75 in. H x 17.125 in. W x 7.87 in. D
(44.5 mm x 435 mm x 200 mm)
Includes front panel controls and rear panel UHF connectors;
does not include antennas or rack ears
Weight
4.32 lbs (1.962 kilograms)
Certification
Complies with FCC Part 15 (FCC ID: DD4L4)
Power supply UL listed, CSA listed as Certified
Conforms to European Union Directives, eligible to bear CE
marking; meets European EMC Immunity Requirements (EN
50 082-1, 1992); ESD (IEC 801-2); RF radiated (IEC 801-3);
EFT (IEC 801-4).
EC1 BODY–PACK TRANSMITTER
RF Power Output
50 mW maximum
Modulation
FM (40K0F3E, FCC Part 90, FCC Part 74)
±
15 kHz deviation,
62
µ
sec pre–emphasis