Shure LX Wireless System User manual

LX Wireless System
User Guide
©2003, Shure Incorporated
27D8654 (Rev. 6)
Printed in U.S.A.
LX Wireless System

1
LX Wireless System
READ ME FIRST!
To get your system up and running in just a few minutes, follow the simple in-
structions on this page. For more detailed information, refer to the sections of
this guide that apply to your system.
RECEIVER CONNECTIONS
1. Attach the antennas to the receiver antenna connectors.
2. Connect the AC power adapter to the receiver power connector; then plug it into an
ac electrical outlet.
3. Connect the receiver audio output to the sound system, using either a low- or
high-impedance audio cable.
TRANSMITTER CONNECTIONS
1. Open the transmitter battery compartment and insert a fresh 9-volt alkaline battery.
Observe proper battery polarity ( “+/–”).
2. If you are using a body-pack transmitter, connect the microphone or WA302 instru-
ment cable to the 4-pin connector on the transmitter.
OPERATING THE SYSTEM
1. Press the receiver POWER switch. The green POWER light on the receiver
illuminates.
2. Set the transmitter PWR/OFF switch to PWR and the ON/MUTE switch to ON. One
of the three lights on the transmitter illuminates, indicating both that the transmitter
is on and the amount of battery life remaining. Two sets of five RF level lights on
the receiver will also glow to indicate the strength of the received signal. The more
lights glowing, the stronger the signal.
3. Have someone talk or sing into the microphone, or play the musical instrument
connected to the transmitter. The audio level will be indicated as follows:
• Green lights (3) glowing indicates normal operation.
• Amber light glowing indicates approaching audio overload (should only occur
during loud signals).
• Red light glowing steadily indicates audio overload. If this happens, reduce the
transmitter gain until it flickers only during the loudest signals. Refer to the
Transmitter Audio Gain Adjustment section of this guide.
4. Adjust the receiver LEVEL control until the output level is compatible with the mixer
or amplifier input. In most cases, this control should be set fully clockwise.
YOU ARE NOW READY TO PERFORM!
IMPORTANT:Every wireless microphone installation is a unique situation,
and can present a variety of problems. Never attempt a live performance
without first conducting a “walkthrough” test of the system in the performing
area. If major changes (additional wireless systems or intercoms, relocation
of scenery, etc.) have been made since the last walk-through test, check the
wireless system again-as close to performance time as possible.

English
2
TABLE OF CONTENTS
TABLE OF CONTENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
SYSTEM COMPONENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
SYSTEM FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
LX1 BODY-PACK TRANSMITTER FEATURES, CONTROLS
AND INDICATORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
LX2 HANDHELD MICROPHONE-TRANSMITTER
FEATURES, CONTROLS AND INDICATORS . . . . . . . . . . . . . . . . . . . . .6
LX3 RECEIVER FEATURES, CONTROLS AND INDICATORS . . . . . . .7
LX4 DIVERSITY RECEIVER FEATURES, CONTROLS
AND INDICATORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
RECEIVER MOUNTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
RECEIVER CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
TRANSMITTER SETUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
OPERATING LX1 BODY-PACK SYSTEMS . . . . . . . . . . . . . . . . . . . . . .14
OPERATING THE LX2 HAND-HELD SYSTEM . . . . . . . . . . . . . . . . . . .15
GAIN AND SQUELCH ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . .16
TIPS FOR ACHIEVING OPTIMUM PERFORMANCE . . . . . . . . . . . . . .17
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
LICENSING INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

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LX Wireless System
SYSTEM COMPONENTS
LX WIRELESS MICROPHONE SYSTEM COMPONENTS
FIGURE 1
Your LX Wireless Microphone System features a MARCAD®fixed frequency diversi-
ty receiver operating in the VHF band between 169 and 240 MHz. Up to 12 LX wireless
systems can be operated simultaneously in a single installation. Each LX system in-
cludes:
• LX1 Body-Pack Transmitter, with your choice of instrument cable or micro-
phone,
or
• LX2 Hand-Held Microphone-Transmitter with your choice of interchangeable
microphone heads:
-SM58
®cardioid dynamic microphone
- BETA 58®supercardioid premium dynamic microphone
- SM87 supercardioid condenser microphone
- BETA 87 supercardioid premium condenser microphone
and one of the following half-rack size receivers:
• LX3 Receiver
or
• LX4 Diversity Receiver
- Both single and dual rack-mounting hardware
- One antenna (LX3 systems) or two antennas (LX4 systems)
- One of the following ac power adapters: PS40,PS40E, or PS40UK.
RECEIVER
RF AUDIO
SQUELCH LEVEL POWER
WIRELESS
LEVEL POWER
RF A RF B AUDIO
SQUELCH
DIVERSITY
MARCAD
LX1
LX2
LX3
LX4

English
4
SYSTEM FEATURES
Shure LX Wireless Systems offer a number of exceptional features, including:
• Exclusive Shure MARCAD Circuitry (LX4). MARCAD (MAximum Ratio Com-
bining Audio Diversity) circuitry constantly monitors signals from both receiver
sections and combines them to create a single output signal. The result is im-
proved reception and exceptional freedom from dropouts.
•
Half-Rack Receiver Size. The LX3 and LX4 receivers interface with the HR
(half-rack) format, and are supplied with both single and dual rack-mount hard-
ware. An optional WA503 accessory kit lets you front-mount antennas.
• Power/Battery Fuel Gauge. The LX1 and LX2 transmitters include a three-light
gauge that indicates both “power on” and the amount of battery life remaining
(see page 12).
• Dual RF Level Meters (LX4). Instead of a conventional single RF meter, the
LX4 receiver has two meters, one for each antenna. The dual meters indicate
received signal strength at each antenna, and make it easier to identify and trou-
bleshoot RF “dead spots.”
•
Audio Metering. A five-light audio meter helps to optimize transmitter gain set-
ting and lets you monitor audio level during operation.
• True Guitar Sound. Guitar players demanding the highest degree of sound
quality and reliability will appreciate the low noise and uncolored sound of the
LX Wireless System.
• Noise Squelch. This circuit analyzes signal quality instead of signal strength .
This virtually eliminates the possibility of annoying noise bursts coming through
your receiver.
•
Body-Pack Transmitter Belt Clip. The belt clip has a wider contact surface for
a better grip, and firmly holds thinner, more slippery materials. It can be re-
moved or inverted for special positioning.
• Grip/Switch Cover Accessory. The unbreakable WA555 grip/switch cover ac-
cessory, supplied with all LX2 hand-held microphone-transmitters, prevents ac-
cidental movement of the power and mute switches and provides a “grip” feel.
• Compact Power Adapter. The supplied ac power adapter incorporates small,
in-line transformers that save space on ac power strips. It also has mounting
tabs so it can be secured to any surface, as well as locking dc power connectors
to prevent accidental disconnection from the receiver.

5
LX Wireless System
LX1 BODY-PACK TRANSMITTER FEATURES, CONTROLS
AND INDICATORS
LX1 BODY-PACK TRANSMITTER FEATURES, CONTROLS AND INDICATORS
FIGURE 2
Antenna. A flexible wire antenna is permanently attached to the bottom of the LX1
body-pack transmitter. For best operation, the antenna must hang in the vertical
position, and should not be coiled or bundled.
Battery Compartment. Hinged cover on bottom surface exposes the battery.
Refer to the Body-Pack Transmitter Battery Installation section.
Audio Gain Control. Allows audio level adjustment to accommodate various
sound sources (e.g., singing, speaking, or playing an instrument). A small screw-
driver is supplied to make adjustments (see the Setting Audio Level section).
Input Jack. This is a Mini- connector (TA4F) that provides connection with a vari-
ety of lavalier and headset microphone cables, and the Shure WA302 instrument
adapter cable.
Power/Battery Fuel Gauge. When the Power switch is turned to the PWR posi-
tion, one or two of the three lights on the transmitter illuminates, indicating power to
the unit. The color of the glowing light(s) indicates the amount of battery life
remaining (see page 12).
Belt Clip. Allows the transmitter to be easily worn on a belt, waistband or guitar
strap.
Mic On/Mute Switch. “Mutes” the transmitter to prevent unwanted sounds from
being picked up by the receiver without turning the transmitter off.
Power Switch. Turns transmitter power on and off.






English
6
LX2 HANDHELD MICROPHONE-TRANSMITTER
FEATURES, CONTROLS AND INDICATORS
LX2 MICROPHONE-TRANSMITTER FEATURES, CONTROLS, AND INDICATORS
FIGURE 3
Grille. Protects the microphone cartridge and helps reduce breath sounds and
wind noise. The grilles for the various microphone heads differ in appearance.
Power Switch. Turns transmitter power on and off.
Power/Battery Fuel Gauge. When the Power switch is turned to the PWR posi-
tion, one or two of the three lights on the transmitter illuminates. The color of the
glowing light(s) indicates the amount of battery life remaining (see page 12).
Mic On/Mute Switch. “Mutes” the transmitter to prevent unwanted sounds from
being picked up by the receiver without turning the transmitter off.
Audio Gain Control. Provides audio level adjustment to accommodate different
sound sources (see page 16).
Battery Cover. Removable cup hides battery and audio gain control.







7
LX Wireless System
LX3 RECEIVER FEATURES, CONTROLS AND INDICATORS
LX3 RECEIVER CONTROLS, FEATURES, AND INDICATORS
FIGURE 4
RF Presence Indicators. Glows amber when the antenna is receiving usable RF
(radio frequency) signals.
Audio Level Indicators. Five lights glow to indicate audio signal strength. Green
lights indicate normal operation. An amber light indicates approaching overload
condition. A red light indicates excessive audio levels.
Squelch Control. Sets the point at which the receiver “mutes” when the transmit-
ter signal becomes noisy, weak or fails. This control is factory-set at the 12 o'clock
position to provide optimal operation in most applications.
Audio Output Level Control. Lets you adjust output level to match the input level
requirements of a mixer or amplifier. In most situations, this control should be set
fully clockwise.
Power On Indicator. This green light glows to indicate that the Power switch is on
and power is applied to the receiver.
Power On/Off Button. Turns the receiver on and off.
Output Connector. Quarter-inch phone jack provides unbalanced auxiliary level
(high-impedance) output.
Power Jack: Accepts power from the supplied AC adapter, or from any filtered 15
to 18 Vdc (400 mA minimum) supply. It will also accept the dc power cord from a
Shure WA405 Antenna Power/Distribution System.
Antenna Connector. UHF-type connector provides connection to the supplied
1/4-wave antenna or to coax cable used with a remote antenna. They also provide
connection to the optional Shure WA421 remote antenna cable kit used with
optional WA380 telescoping and WA490 cable-type 1/2-wave antennas.
WIRELESS
RECEIVER
RF AUDIO
SQUELCH LEVEL POWER
ANT
OUTPUT
HIZ POWER
12.5 – 18.9 VDC
FRONT
REAR




English
8
LX4 DIVERSITY RECEIVER FEATURES, CONTROLS
AND INDICATORS
LX4 DIVERSITY RECEIVER FEATURES, CONTROLS AND INDICATORS
FIGURE 5
Diversity Signal Indicators for A and B Antennas. These lights glow amber
when A, B, or both antennas are receiving usable RF (radio frequency) signals.
RF Level Indicators. Five lights per antenna glow to indicate RF signal strength.
The more lights that glow, the stronger the received signal. If none of these lights
glows, no signal is being received.
Audio Level Indicators. Five lights glow to indicate audio signal strength. Green
lights indicate normal operation. An amber light indicates approaching overload
condition. A red light indicates excessive audio levels.
Squelch Control. Sets the point at which the receiver “mutes” when the transmit-
ter signal becomes noisy, weak or fails. This control is factory-set at the 12 o'clock
position to provide optimal operation in most applications.
Audio Output Level Control. Lets you adjust output level to match the input level
requirements of a mixer or amplifier. In most situations, this control should be set
fully clockwise.
Power On Indicator. This green light glows to indicate that the Power switch is on
and power is applied to the receiver.
Power On/Off Button. Turns the receiver on and off.
Antenna Connectors. UHF-type connectors provide connection to the supplied
1/4-wave antennas or to coax cable used with remote antennas. They also provide
connection to the optional Shure WA421 remote antenna cable kit used with
optional WA380 telescoping and WA490 cable-type 1/2-wave antennas.
Output Connectors. XLR connector provides balanced low-impedance mic level
or line-level output. Quarter-inch phone jack provides unbalanced auxiliary level
(high-impedance) output.
쐅Mic/Line Slide Switch: Controls output of balanced XLR connector. It can be set
for microphone (–20 dBV maximum) or line-level (+0 dBV maximum).
쐈Power Jack: Accepts power from the supplied ac adapter, or from any filtered 15
to 18 Vdc (400 mA minimum) supply. It will also accept the dc power cord from a
Shure WA405 Antenna Power/Distribution System.
POWER
MARCAD
DIVERSITY
RF A RF B AUDIO
SQUELCH LEVEL
12.5 –18.9 VDC
ANTANT
OUTPUTS
HI Z BAL
MIC LINE
POWER
AB





쐅쐈

9
LX Wireless System
RECEIVER MOUNTING
SINGLE RACK-MOUNTED RECEIVER (FIGURE 6)
If the receiver is to be located on a table or other horizontal surface, attach the four
adhesive bumpers to the bottom corners of the receiver. If the receiver is to be mounted
in an audio equipment rack, identify the rack-mount kits supplied with your system and
follow the appropriate assembly directions below.
1. Remove two screws from each side of the receiver.
2. Position the large mounting brackets over the holes on the sides of the receiver
and secure them to the receiver with the screws removed in Step 1.
3. If you are not going to front mount the antennas with a Shure WA503 Front Mount
Conversion Kit, insert the plastic plugs into the holes in the brackets.
4. Secure the assembly to a standard audio equipment rack with four screws.
SINGLE RACK-MOUNTED RECEIVER
FIGURE 6
DOUBLE RACK-MOUNTED RECEIVERS
1. Remove the two screws on the outer side of each receiver.
2. Position the small mounting brackets over the holes on the outer side of each
receiver, and secure them with the screws removed in Step 1.
3. Remove the screws on the inner side of each receiver.
4. Position two link bars over the holes and secure them with the screws removed in
Step 3. For the receiver on the left, the link bar should be positioned so that its
threaded hole is toward the front of the receiver. For the receiver on the right, the
link bar should be positioned so that its threaded hole is toward the rear of the
receiver.
DOUBLE RACK-MOUNTED RECEIVERS
FIGURE 7
5. Place the two receivers next to each other so that the threaded holes in the link
bars line up, one on top of the other.
6. Fasten the receivers together by inserting a small screw from the top into the
threaded hole at the front of the link bar. Then insert the other screw from the bot-
tom into the threaded hole at the rear of the link bar.
7. Secure the assembly to a standard audio equipment rack, using four screws.
LINK BARS

English
10
RECEIVER CONNECTIONS
1. Attach the supplied quarter-wave antenna(s) to the antenna connector(s) on the
receiver back panel. For best performance, the LX4 receiver antennas should be
oriented with the tips pointing away from each other at a 45° angle from vertical.
The LX3 receiver antenna should be vertical.
2. Connect the receiver output to the mixer or amplifier input, using a standard audio
cable with a female 3-pin XLR connector or 1/4-inch phone plug.
3. Connect the ac adapter to the POWER jack on the rear panel of the receiver.
4. Plug the ac adapter into an appropriate ac power source.
RECEIVER CONNECTIONS
FIGURE 8
NOTE: If the receiver is rack-mounted, the antenna(s) must extend above the rack
cabinet or be remotely located.
Improved LX4 diversity performance may be obtained by installing one or both
antenna(s) at a remote location and separating them by 1.5 meters (60 inches) or
more. Shure WA380 telescoping or WA490 cable-type 1/2-wave antennas are
recommended for remote location, and they should be connected to the receiver via
WA421 Extension Cable Kit(s) or other suitable low-loss cable.
WIRELES
S
RECEIVER
RF AUDIO
SQUELCH LEVEL POWER
ANT
OUTPUT
HI Z POWER
12.5 – 18.9 VDC
45° 45°
LX4 LX3
AUDIO MIXER
LX4 LX3
AUDIO MIXER

11
LX Wireless System
TRANSMITTER SETUP
LX1 BODY-PACK TRANSMITTER BATTERY INSTALLATION
1. With the transmitter POWER PWR/OFF switch in the OFF position, press down on
the OPEN side of the battery compartment cover, slide it back and flip it open.
2. Insert a new 9V alkaline battery in the compartment. Observe proper battery polar-
ity (“+/–”).
LX1 BODY-PACK TRANSMITTER BATTERY INSTALLATION
FIGURE 9
LX2 HAND-HELD MICROPHONE-TRANSMITTER BATTERY INSTALLATION
1. With the transmitter PWR/OFF switch in the OFF position, hold the upper part of
the transmitter and unscrew the battery cover.
2. Install a fresh 9V alkaline battery. Make sure the battery terminals match the termi-
nals in the transmitter.
3. Screw the battery cover back into place.
LX2 MICROPHONE-TRANSMITTER BATTERY INSTALLATION
FIGURE 10
IMPORTANT: A fresh 9V alkaline battery should provide 18 to 20
hours of operation. However, an 8.4V nickel-cadmium (nicad)
battery will only provide 3 hours of operation. Carbon-zinc and
zinc-chloride batteries will not provide sufficient power, and are not
recommended.

English
12
CHECKING THE TRANSMITTER BATTERY
Turn the transmitter PWR/OFF switch to the PWR position and observe that one or
two of the three lights on the transmitter glows. The amount of battery life remaining will
be indicated by the color of the light(s), as shown in the following table.
*Estimated operating time assumes the use of a fresh 9 V alkaline battery.
NOTE: A rechargeable 8.4V nicad battery causes the indicators to change more
quickly than if using a 9V alkaline battery. Actual times depend on the type and brand
of battery used.
CONNECTING A MICROPHONE OR INSTRUMENT CABLE TO THE LX1
1. Connect the microphone cable or instrument cable to the transmitter input jack.
2. Install the microphone by attaching it to the user's tie, shirt, or collar (lavalier mic),
placing it over the user's head (headset mic), or affixing it to an acoustic musical
instrument (instrument mic).
3. If using an instrument adapter cable, attach the other end of the instrument cable to
the instrument output connector.
LX1 BODY-PACK TRANSMITTER CABLE CONNECTION
FIGURE 11
Battery Life Indicators Remaining Transmitter
Operating Time*
Green 6 to 20 hours
Green and Amber 4 to 6 hours
Amber 2 to 4 hours
Red 1 hour or less
MICROPHONE CABLE OR WA302
INSTRUMENT ADAPTER CABLE

13
LX Wireless System
ATTACHING THE LX1 TO A BELT OR GUITAR STRAP
Attach the LX1 body-pack transmitter clip to a belt, waistband, or guitar strap by de-
pressing the tab marked PRESS and slipping the belt or strap between the transmitter
body and the belt clip, as shown in Figure 11. The clip holds tightest if the material is
drawn to the clip's top wire (especially thinner guitar straps).
ATTACHING THE LX1 TO A BELT OR GUITAR STRAP
FIGURE 12
INSTALLING THE WA555 GRIP/SWITCH COVER ACCESSORY
ON THE LX2
The LX2 transmitter comes with an external sleeve accessory (WA555) that prevents
accidental movement of the microphone controls without affecting RF performance. It
also provides the microphone with a “grip” feel. To install the grip/switch cover, proceed
as follows:
INSTALLING THE OPTIONAL LX2 GRIP/SWITCH COVER ACCESSORY
FIGURE 13
Unscrew the battery cover.
Slide the cover over the microphone handle, “lip” end downward. The cover fits
snugly and requires additional pressure for the last inch of travel.
Reinstall the battery cover.
BELT OR GUITAR STRAP
 
WA55 GRIP/SWITCH
COVER

English
14
FIGURE 14
LX1 BODY-PACK SYSTEM SETUP AND OPERATION
OPERATING LX1 BODY-PACK SYSTEMS
1. Clip the LX1 body pack transmitter to your belt, waistband, or guitar strap.
2. Connect the lavalier microphone, headset or instrument adapter cable to the body-
pack transmitter.
3. If you are using a lavalier microphone, clip the mic to your tie, lapel, or other gar-
ment. If you are using a headset, put the headset on. If you are using a Shure
WM98 microphone, insert it into an A98KCS horn mount and clamp it to your horn.
If you are using an instrument adapter cable, plug the cable into the instrument.
4. Slide the transmitter PWR/OFF switch to the PWR position. One of the three lights
on the transmitter illuminates.
5. Press the POWER button on the receiver. The green “power on” light on the
receiver and the RF light(s) illuminates.
6. Slide the transmitter ON/MUTE switch to the ON position and begin speaking or
playing your instrument.
NOTE: If the red PEAK light on the receiver does not flicker during the loudest
sounds, the transmitter gain may need to be increased. Refer to the Adjusting the
Transmitter Audio Gain Level section.Then, if the system is still not operating
properly, consult the Troubleshooting table.
7. During the performance or presentation, slide the ON/MUTE switch to the MUTE
position when the system is not in use.
8. When the performance or presentation is over, slide the transmitter PWR/OFF
switch to the OFF position to conserve battery power.
WH20
HEADSET WM98 MIC AND
AK98KCS MOUNT
WA302 INSTRUMENT
ADAPTER CABLE
LAVALIER
MICROPHONE
RECEIVER

15
LX Wireless System
OPERATING THE LX2 HAND-HELD SYSTEM
LX2 HAND-HELD MICROPHONE SYSTEM OPERATION
FIGURE 15
1. Slide the transmitter PWR/OFF switch to the PWR position. One of the three lights
on the transmitter illuminates.
2. Press the POWER button on the receiver. The green power on indicator and the
RF light(s) illuminates.
3. Slide the transmitter ON/MUTE switch to the ON position and begin speaking or
playing your instrument.
NOTE: If the red PEAK light on the receiver does not flicker during the loudest
sounds, the transmitter gain may need to be increased. Refer to the Adjusting the
Transmitter Audio Gain Level section.Then, if the system is still not operating
properly, consult the Troubleshooting table.
4. During the performance or presentation, slide the ON/MUTE switch to the MUTE
position when the system is not in use.
5. When the performance or presentation is over, slide the transmitter PWR/OFF
switch to the OFF position to conserve battery power.
LX2
TRANSMITTER
RECEIVER

English
16
GAIN AND SQUELCH ADJUSTMENT
ADJUSTING THE TRANSMITTER AUDIO GAIN LEVEL
The transmitter audio gain level has been factory pre-set to provide satisfactory out-
put in most applications. However, for loud singers or high-output musical instruments,
the preset level may be too high, as indicated by the constant glow of the red light on
the receiver audio level meter. Soft-spoken talkers or singers may find that the factory
setting is too low, as indicated by the failure of the amber audio level light to light at all.
To adjust the audio gain, locate the transmitter audio gain control and use the sup-
plied screwdriver to adjust the control.
• For high sound pressure level applications, such as loud singing, decrease the
audio gain level by rotating the gain control counterclockwise (while the vocalist
is singing or the musical instrument is being played) until the red audio level light
on the receiver flickers occasionally.
• For low sound pressure level applications, such as soft-spoken talkers, increase
the audio gain level by rotating the gain control clockwise (while the vocalist is
singing or the musical instrument is being played) until the red audio level light
on the receiver flickers occasionally.
NOTE: If using the WH20TQG headset, you must increase the gain level to the full
clockwise position. Then, if necessary, rotate the control back slightly.
TRANSMITTER AUDIO GAIN LEVEL ADJUSTMENT
FIGURE 16
DECREASE GAIN
INCREASE GAIN
DECREASE
GAIN
INCREASE
GAIN
LX1 LX2

17
LX Wireless System
ADJUSTING THE RECEIVER SQUELCH CONTROL
The receiver squelch control is factory preset at the 12 o'clock position for op-
timum performance. No further adjustment is normally required. However, it is
possible to adjust the squelch control to emphasize either signal quality or system
range.
• To raise the squelch threshold, rotate the control clockwise. This causes the re-
ceiver to demand a higher quality signal (less noise before muting), but it reduc-
es the operating range.
• To lower the squelch threshold, rotate the control counterclockwise. This allows
a lower quality signal through (more noise before muting), but it extendsthe op-
erating range.
RECEIVER SQUELCH CONTROL ADJUSTMENT
FIGURE 17
TIPS FOR ACHIEVING OPTIMUM PERFORMANCE
• Maintain a line-of-sight between the transmitter and receiver antennas, if possi-
ble. Avoid placing transmitter and receiver where metal or other dense materials
may be present.
• Avoid placing the receiver near computers or other RF generating equipment.
• Avoid placing the receiver in the bottom of an equipment rack unless the anten-
nas are remotely located.
• Use the proper receiver antenna(s). A 1/4-wave antenna can be used if it is
mounted directly on the receiver; use a 1/2-wave or other ground-plane-depen-
dent antenna if antennas are remotely located. Use the Shure WA503
Front-Mount Antenna Conversion Kit to mount antennas on the front of the re-
ceiver.
• Mount 1/4-wave antennas with the antenna tips pointed away from each other
at a 45
° angle, and away from large metal objects.
• Use the proper antenna cable when remotely locating receiver antennas. For
best performance, use the Shure WA421 50 W RG-58 coaxial antenna cable,
and the minimum length necessary. For cable runs greater than 12.2 meters (40
feet), use RG-8 coaxial cable.
• Mount diversity antennas at least 1/4-wave apart [42 cm (17 inches) for VHF
systems, although a 1.5 m (60 inches) spacing is preferred]. For multiple system
installations, use the Shure WA405 Antenna/Power Distribution Kit or the
WA470 Passive Antenna Splitter to minimize the number of antennas and re-
duce interference.
• Use the Shure WA302 Instrument Cable when using the LX1 transmitter with a
musical instrument.
• If using multiple wireless systems, maintain a distance of at least 3 meters
(10ft.) between the transmitter and the closest receiving antenna.
WIRELESS
RECEIVER
RF AUDIO
SQUELCH LEVEL POWER
LX4 LX3
DECREASE
SQUELCH INCREASE SQUELCH
DECREASE
SQUELCH INCREASE SQUELCH

English
18
TROUBLESHOOTING
Problem Solution
No sound; receiver RF light(s) and
AUDIO lights not glowing.
Make sure POWER switches on transmitter
and receiver are on.
Check transmitter Power/Battery Fuel
Gauge to ensure that battery is providing
power. Replace battery if necessary.
Check receiver squelch setting.
Check receiver antenna connection(s).
Make sure at least one antenna is in the line
of sight of the transmitter. If necessary,
reduce the distance between transmitter and
receiver.
No receiver sound; RF and Audio Level
meter lights glowing.
Turn up the receiver audio output LEVEL
control.
Check for proper connection between
receiver and microphone mixer.
Talk into the microphone and observe the
receiver audio level lights. If they glow, the
problem is elsewhere in the sound system.
Received signal is noisy or contains
extraneous sounds with transmitter on.
Check Power/Battery Fuel Gauge and
replace battery if power is low.
Remove local sources of RF interference,
such as lighting equipment.
If using a guitar or other instrument, make
sure it is connected to the LX1 with a Shure
WA302 adapter cable.
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.
Adjust receiver squelch control.
Noise from receiver with transmitter off. Adjust receiver squelch control.
Remove local sources of RF interference,
such as lighting equipment.
Reposition the receiver or antennas.
Momentary loss of sound as transmitter
is moved around performing area.
Reposition receiver and perform another
“walkthrough” test and observe the RF level
or Diversity signal indicators. If audio
dropouts persist, mark these “dead spots” in
the performing area and avoid them during
the performance.

19
LX Wireless System
SPECIFICATIONS
RF Carrier Frequency Range
169.445 to 240.000 MHz (available frequencies depend on the applicable regulations in
the country where the system is used)
Working Range
91 m (300 ft) under typical conditions. NOTE: Actual working range depends on RF signal
absorption, reflection and interference.
Audio Frequency Response
50 to 15,000 Hz, +2 dB. NOTE: Overall system frequency response depends on the mi-
crophone element.
Audio Output Level (+15 kHz deviation, 1 kHz tone)
XLR connector (into 600 Wload): 0 dBV (line), –20 dBV (mic)
1/4-inch connector (into 3 kWload): –8.8 dBV
Gain Adjustment Range
LX1: 40 dB
LX2: 25 dB
Impedances
LX1 (input): 1 MW
LX3 (output): 3 kW(1/4-inch phone jack)
LX4 (output): 150 W(XLR); 3 kW(1/4-inch phone jack)
Modulation
+15 kHz deviation compressor-expander system with pre- and de-emphasis
RF Power Output
LX1, LX2: 50 mW maximum (complies with FCC and IC regulations)
Dynamic Range
>102 dB, A-weighted
RF Sensitivity
0.45 mV for 12 dB SINAD (typical)
Image Rejection
80 dB typical
Spurious Rejection
75 dB typical
Ultimate Quieting (ref. 15 kHz deviation)
>100 dB, A-weighted
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 out-
put and the tip of the high impedance 1/4-inch output.
System Distortion (ref. +15 kHz deviation, 1 kHz modulation)
0.3% THD typical
Power Requirements
LX1, LX2: 9V alkaline battery; 8.4V Nicad optional
LX3, LX4: 12.5–18 Vdc (negative ground), 400 mA
Battery Life
18 to 20 hours
Operating Temperature Range
–20°to 50°C (–45 to 122°F). NOTE: Battery characteristics may limit this range.