Shure LX88-II User Manual
Page 10
TIPS FOR GETTING THE BEST PERFORMANCE
•
Maintain a line-of-sight between the transmitter and receiver antennas.
•
Keep the receiver and antennas away from large metal objects.
•
Avoid placing the receiver near computers or other RF generating equipment.
•
Point the antennas straight up.
•
Avoid placing the receiver in the bottom of an equipment rack unless the an-
tennas are remotely located.
•
Use the proper receiver antennas.
1
/
4
-wave antennas can be used if mounted
directly on the receiver or front mounted on the rack ears using the WA503
Front Mount Conversion Kit;
1
/
2
-wave or other ground-plane-dependent an-
tennas must be used if antennas are remotely located.
TROUBLESHOOTING
Some common problems and their solutions are identified in the table below.
If you are unable to solve a problem, contact your dealer.
Problem
Solution
No sound; RF light(s)
not glowing.
•
Make sure the transmitter and receiver POWER
switches are ON.
•
Check battery.
•
Check receiver squelch setting.
•
Check receiver antenna connection(s).
•
Make sure antennas are in line of sight of
transmitter.
No sound; RF and Audio Level
meter lights glowing.
•
Turn up receiver audio VOLUME control.
•
Check for proper connection between receiver
and karaoke unit.
•
Talk into microphone and observe receiver audio
level lights. If they glow, the problem is
elsewhere in the sound system.
Received signal is noisy or con-
tains extraneous sounds with
transmitter on.
•
Check battery.
•
Remove local sources of RF interference.
•
If using a guitar or other instrument, check
connections.
•
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 transmitter.
Noise from receiver with trans-
mitter off.
•
Adjust receiver squelch control.
•
Remove local sources of RF interference.
•
Reposition receiver or antennas.
Momentary loss of sound as
transmitter is moved around per-
forming area.
•
Reposition receiver and perform another
“walkthrough” test and observe the RF
indicators. If audio dropouts persist, mark these
“dead spots” in performing area and avoid them
during performance.
SPECIFICATIONS
RF Carrier Frequency Range
169.445 to 221.350 MHz
Working Range
100 m (approximately 300 ft) under typical conditions.
Audio Frequency Response
50 to 15,000 Hz,
±
2 dB.
Audio Output Level (
±
15 kHz deviation, 1 kHz tone)
XLR connector (into 600
Ω
load): –20 dBV (mic)
1
/
4–
inch connector (into 3 k
Ω
load)
:
–8.8 dBV (Hi Z)
1
/
4
inch connector (into 3 k
Ω
load)
:
–18dBV (mix)
Gain Adjustment Range
LX1: 40 dB
LX2: 25 dB
Impedances
LX1 (input): 1 M
Ω
LX88-
II
(output): 600
Ω
(XLR); 5 k
Ω
(
1
/
4
-inch phone jack)
RF Power Output
LX1, LX2: 50 mW maximum (complies with FCC and IC regulations)
RF Sensitivity
–101 dBm, typical
Audio Polarity
Positive pressure on microphone diaphragm (or positive voltage applied to tip
of WA302 phone plug) produces positive voltage on pin 2 with respect to pin 3
of low impedance output and tip of high impedance
1
/
4
-inch output.
System Distortion (ref.
±
15 kHz deviation, 1 kHz modulation)
0.7%
Power Requirements
LX1, LX2: 9V alkaline battery (Duracell MN1604 recommended). 8.4V Nicad (re-
chargeable) are optional but not recommended.
LX88-
II
: 12 Vdc (PS20, 120Vac; PS20E, 230 Vac Power Supply)
Current Drain
LX1: 31 mA average (40 mA max), LX2: 30 mA average (35 mA max)
LX88-
II
: 160 mA average (195 mA max)
Operating Temperature Range
-20
°
to 50
°
C (-4
°
to 122
°
F). NOTE: Battery characteristics may limit this
range.
Overall Dimensions
LX1: 82.6 mm H x 63.5 mm W x 26.2 mm D (3
1
/
4
x 2
1
/
2
x 1
1
/
32
in.)
LX2/58: 241 mm L x 50.8 mm Dia. (9
1
/
2
x 2 in.)
LX88-
II
: 44 mm H x 349 mm W x 194mm D (1 3/4 x 13 3/4 x 7 5/8 in)
Net Weight
LX1: 79.5 g (2.8 oz) without battery
LX2/58: 294.8 g (10.4 oz) without battery
LX88-
II
: 1.7 Kg (3.7 lbs)
Certification
LX1, LX2: Type-accepted under FCC Parts 90 and 74; IC certified under
TRC-78
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15