OPERATING INSTRUCTIONS
UHF WIRELESS TUNER
WT-4820
ANT
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ANT
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PEAK
CHANNEL
VOLUM
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ANT
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UNER
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TABLE OF CONTENTS
1. SAFETY PRECAUTIONS ........................... 2
2. GENERAL DESCRIPTION ......................... 3
3. FEATURES ................................................. 3
4. HANDLING PRECAUTIONS ...................... 3
5. NOMENCLATURE AND FUNCTIONS
Front ............................................................ 4
Rear ............................................................. 4
6. INSTALLING THE WTU-4800
7. PRECAUTIONS ON ANTENNA
INSTALLATION .......................................... 5
8. OPERATION ............................................... 6
9. CONNECTION ............................................ 6
10. INSTALLATION
10.1. Rack Mounting ................................... 7
10.2. Installing the Unit on a Desk ............... 8
11. SPECIFICATIONS ...................................... 8
Accessories ................................................. 8
TUNER MODULE ....................................... 5
Please follow the instructions in this manual to obtain the optimum results from this unit.
We also recommend that you keep this manual handy for future reference.
• Avoid installing the unit in humid or dusty locations,
in locations exposed to the direct sunlight, near the
heaters, or in locations generating sooty smoke or
steam as doing otherwise may result in fire or
electric shock.
When the Unit is in Use
• Do not place heavy objects on the unit as this may
cause it to fall or break which may result in
personal injury and/or property damage. In
addition, the object itself may fall off and cause
injury and/or damage.
• When moving the unit, be sure to remove its power
supply cord from the wall outlet. Moving the unit
with the power cord connected to the outlet may
cause damage to the power cord, resulting in fire or
electric shock. When removing the power cord, be
sure to hold its plug to pull.
• Make sure that the volume control is set to
minimum position before power is switched on.
Loud noise produced at high volume when power is
switched on can impair hearing.
• Leave the installation of the optional YW-4500
antenna to your TOA dealer because the
installation requires expert knowledge. Improper
installation may cause the antenna to fall, resulting
in personal injury or electric shock.
• Use the dedicated AC-DC adapter for the unit.
Note that the use of other adapter may cause a
fire.
• If dust accumulates on the power supply plug or in
the wall AC outlet, a fire may result. Clean it
periodically. In addition, insert the plug in the wall
outlet securely.
• The socket-outlet shall be installed near the
equipment and shall be easily accessible. A fire or
electric shock may result.
• Switch off the power, and unplug the power supply
plug from the AC outlet for safety purposes when
cleaning or leaving the unit unused for 10 days or
more. A fire or electric shock may result.
• Install the AC-DC adapter in well-ventilated
locations. Do not install the adapter in a confined
space such as a book case or similar unit . In
addition, keep over 1 m space above the adapter.
2. GENERAL DESCRIPTION
The WT-4820 is a diversity tuner that can accept up to two wireless tuner modules of UHF band (WTU-4800).
It can be mounted in an EIA 19-inch equipment rack using an optional MB-WT3 or MB-WT4 Rack Mount
Bracket Kit.
3. FEATURES
• Half-rack mount size
• Easy-to-change channel number accessible from the front.
• Front-loading modular construction permits easy installation of the WTU-4800 tuner module even after the
unit is rack-mounted.
• Antenna outputs connect an additional tuner unit, expanding the system to maximum 4 channels (2 each
tuner modules incorporated) without need for extra antenna mixers/distributors.
• A mix input mixes outputs of two or more tuner units into one output signal.
4. HANDLING PRECAUTIONS
• Use only WM-4200 series and WM-4300 series Wireless Microphones. Other wireless microphones cannot
be used.
• Turn the power switch off after use.
• When mounting in an equipment rack, place the unit away from high-temperature equipment.
• When using two or more wireless microphones at the same time in the same location, set them to different
channels and keep them at least 50 cm from each other.
• Keep the wireless microphone at least 3 m away from the antenna.
• Connect two antennas to the unit. Using a single antenna disables the diversity effect.
• Keep the unit as far away as possible from fluorescent lamps, digital equipment, computers, and other
equipment generating high-frequency noise.
• To clean the unit, switch the power off, then wipe with a dry cloth. When the unit gets very dirty, use a cloth
damped in a neutral cleanser. Never use benzene, thinner or chemically-treated cleaning cloth because
such volatile liquids could deform or discolor the unit.
3
5. NOMENCLATURE AND FUNCTIONS
[Front]
5
6
3 4
7
8
1
2
ANT
ANT
A
B
ANT
ANT
A
B
CHANNEL
CHANNEL
PEAK
VOLUME
PEAK
VOLUME
POWER
TUNER1
TUNER2
ON
OFF
0
10
0
10
DIVERSITY WIRELESS TUNER WT-4820
1. Power switch
5. Front panel
Turns the power on when pressed.
Detach this panel when installing or removing the
Turns it off when pressed again.
WTU-4800 tuner module. Refer to p. 5.
2. Power indicator
6. Reception indicators
Lights when power is on.
Either lights to indicate which antenna A or B
receives a radio signal.
3. Wireless microphone volume control
Adjusts the wireless microphone volume.
7. Peak indicator
Lights when a receiving wireless microphone
signal is distorted.
4. Front panel mounting screw
When installing the optional WTU-4800 Diversity
Wireless Tuner Module, remove two screws to
detach the front panel. Refer to p. 5.
8. Channel selector switch
Sets the receiving channel.
[Rear]
9
10 11
12
13
14 15 16
17
18
ANT B
DC IN
OUTPUT
-20dBV/600Ω(+6dBV Max)
MIX IN
-20dBV/10kΩ
ANT A
2
MIX/1
IN
OUT
IN
1
2
MIX
1
12-18V
250mA(max)
(BALANCED)
HOT
COLD
3
(UNBALANCED)
SELECTOR
9. Antenna B input connector
1: Outputs the tuner module 1 solo signal.
BNC jack, 75 Ω.
15. Mix/solo output 1 terminal
Connects to the supplied antenna or the optional
YW-4500 Antenna. When using the supplied
antenna, tilt it about 45° out from upright position.
–20 dB (+6 dB max.), 600 Ω, balanced.
Outputs either the mixed signal of the tuner
modules 1 and 2, and the Mix input (16) source
or the tuner module 1 solo signal.
10. Power input connector
Connects to an AC-DC adapter.
16. Mix input terminal
–20 dB, 10 kΩ, unbalanced.
Connects to an additional wireless tuner for
expansion.
11. Cable hanger
Hook the power cable onto this part.
12. Solo output 2 terminal
Refer to p. 7.
–20 dB (+6 dB max.), 600 Ω, unbalanced.
Outputs the tuner module 2 signal.
17. Antenna A output connector
BNC jack, 75 Ω.
13. Mix/solo output 1 terminal
Used to add a wireless tuner (totaling two tuners)
without need for extra antenna mixers or
distributors.
–20 dB (+6 dB max.), 600 Ω, unbalanced.
Outputs either the mixed signal of the tuner
modules 1 and 2, and the Mix input (16) source
or the tuner module 1 solo signal.
18. Antenna A input connector
BNC jack, 75 Ω.
14. Mix/solo output 1 selector switch
Selects the type of signal to be outputted from
the Mix/solo output 1 terminals (13) and (15).
MIX: Outputs the mixed signal of the tuner
modules 1 and 2, and the Mix input (16)
source.
Connects to the supplied antenna or optional
YW-4500 Antenna.
When using the supplied antenna, tilt it about 45°
out from upright position.
4
6. INSTALLING THE WTU-4800 TUNER MODULE
Precautions
• To prevent static damage to internal parts, discharge static electricity from your body and cloth by touching
the equipment rack, the unit's rear, or other metal object before starting the work.
• Turn the power off before installing the tuner module.
• Avoid touching the edge connector of tuner module.
• Do not install the tuner module upside down.
Step 1. Remove the two front mounting screws to detach the front panel.
Step 2. Insert the WTU-4800 tuner module and ensure its connection.
1
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Step 3. Replace the front panel, and fix it with the removed mounting screws.
7. PRECAUTIONS ON ANTENNA INSTALLATION
• Keep the wireless microphone at least 3 m away from the antenna. Using the microphone close to the
antenna may cause malfunction or noise.
• Avoid installing the antenna to or near steel beam, lockers, and other metal objects. Besides, keep it at least
30 cm away from wall surfaces.
• Keep the unit as far away as possible from the following equipment that may generate high-frequency noise:
inverter-driven equipment (such as fluorescent lamps or air-conditioners), digital equipment, and computers.
• Never short antenna cables or the unit's antenna connectors. If they are shorted, the power supply to the
antenna shorts, possibly causing unit's failure.
• Install the antenna and the unit as close as possible to each other to minimize the coaxial cable length.
• Use the optional YW-4500 Antenna when mounting the unit in an equipment rack.
• Install the antenna cable referring to the following type of cable vs. permissible maximum length.
RG-6/U (diameter 8.4 mm): 35 m
RG-11/U (diameter 10.3 mm): 50 m
5
8. OPERATION
The following operation procedure is an example for the tuner module 1. The same procedure applies to the
tuner module 2.
ANT
ANT
A
B
ANT
ANT
A
B
CHANNEL
CHANNEL
PEAK
VOLUME
PEAK
VOLUME
POWER
TUNER 1
TUNER 2
ON
OFF
0
10
0
10
DIVERSITY WIRELESS TUNE820
2
4
1
Step 1. Turn the unit's power on.
Step 2. Set the channel selector switch to the predetermined channel number using the screwdriver supplied
with the WTU-4800.
Step 3. Turn the wireless microphone's power on.
Step 4. Adjust the wireless microphone volume control for proper level.
9. CONNECTION
[Connection Example 1]
Wall-mounted wireless antenna
YW-4500 (optional)
Wall-mounted wireless antenna
YW-4500 (optional)
Accessory
antenna
Accessory
antenna
or
or
WT-4820
ANT B
DC IN
OUTPUT
-20dBV/600Ω(+6dBV Max)
MIX IN
-20dBV/10kΩ
ANT A
2
MIX/1
IN
OUT
IN
1
2
MIX
1
12-18V
250mA(max)
(BALANCED)
HOT
COLD
3
(UNBALANCED)
SELECTOR
AC-DC adapter
To the line input of a mixer
or other equipment
6
[Connection Example 2]
Wall-mounted wireless antenna
YW-4500 (optional)
Wall-mounted wireless antenna
YW-4500 (optional)
Accessory
antenna
Accessory
antenna
or
or
AC-DC adapter
1st WT-4820 unit
ANT B
DC IN
OUTPUT
-20dBV/600Ω(+6dBV Max)
MIX IN
-20dBV/10kΩ
ANT A
2
MIX/1
IN
OUT
IN
1
2
MIX
1
12-18V
250mA(max)
(BALANCED)
HOT
COLD
3
(UNBALANCED)
SELECTOR
2nd WT-4820 unit
ANT B
DC IN
OUTPUT
-20dBV/600Ω(+6dBV Max)
MIX IN
-20dBV/10kΩ
ANT A
2
MIX/1
IN
OUT
IN
1
2
MIX
1
12-18V
250mA(max)
(BALANCED)
HOT
COLD
3
(UNBALANCED)
SELECTOR
AC-DC adapter
To the line input of a mixer
or other equipment
10. INSTALLATION
10.1. Rack Mounting
Caution
Use the optional YW-4500 Antenna when mounting the unit in an equipment rack.
• To mount one unit in an equipment
rack, use the optional MB-WT3 Rack
Mount Kit.
Fiber washer
(supplied with MB-WT3)
Rack mounting screw
(supplied with MB-WT3)
A
A
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-4
8
20
Rack
• To mount two units in an equipment
rack, use the optional MB-WT4 Rack
Mount Kit.
Fiber washer
(supplied with MB-WT4)
Rack mounting screw
(supplied with MB-WT4)
A
N
N
E
T
T
A
A
P
B
A
K
C
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B
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IV
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IT
P
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LE
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B
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AN
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P
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AK
4
8
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NEL
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1
0
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EA
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HA
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UN
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PO
W
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W
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IR
N
R
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LE
S
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-4
8
20
Note
For the mounting methods, refer to the MB-WT3 or MB-WT4 instruction manual.
Rack
7
10.2. Desktop Mounting
Attach the 4 supplied rubber feet to the bottom surface
of the unit when installing the unit on the desk.
Rubber foot
(supplied with unit)
0
1
0
V
O
L U M
P E
A N T
A
E
A
K
B
N
T
A
T
U N E
0
1 R
1
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C H
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N N E
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O L U M
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V E R S
P E
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I R E L
B
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A N T
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N E R
W T
2 R
O F F
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4
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2
A
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N N E
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W E
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11. SPECIFICATIONS
Power Source
AC mains (an AC-DC adapter*1 must be used.)
250 mA (12 V DC, when operating with two tuner modules)
690 – 870 MHz, UHF
Power Consumption
Receiving Frequency
Mixing Input
–20 dB*2, 10 kΩ, unbalanced, phone jack
Audio Output
Mixing/Solo 1 (selectable):
–20 dB*2 (+6 dB*2 Max.), 600 Ω, unbalanced, phone jack
–14 dB*2 (+12 dB*2 Max.), 600 Ω, balanced, XLR-3-31 type connector
Solo 2: –20 dB*2 (+6 dB*2 Max.), 600 Ω, unbalanced, phone jack
75Ω, BNC (phantom powering for antenna), 9 V DC, 30 mA (max)
75Ω, BNC (Gain 0 dB)
Antenna Input
Antenna Output
Indicator
S/N Ratio
Harmonic Distortion
Frequency Response
Operating Temperature
Finish
ANT A/B, Audio (peak), Power
Over 102 dB (A-weight, balanced output)
Under 1%
50 – 18,000 Hz, 3 dB
–10°C to +50°C
Resin, black
Dimensions
Weight
210 (w) x 44 (h) x 181 (d) mm
770 g (without tuner module)
1
* May not included with the unit marketed in your country. In this case, prepare it locally. Please consult your
TOA dealer in advance for details of the adapter.
2
* 0 dB = 1 V
Note: The design and specifications are subject to change without notice for improvement.
• Accessories
AC-DC adapter*1 ........................................ 1
Rod antenna ............................................... 2
Rubber foot ................................................ 4
• Optional products
Antenna:
YW-4500
Mounting bracket kit: MB-WT3 (for rack mounting one WT-4820 unit)
MB-WT4 (for rack mounting two WT-4820 units)
Printed in Taiwan
133-07-228-20
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