TOA Electronics TV Receiver WT 4820 User Manual

OPERATING INSTRUCTIONS  
UHF WIRELESS TUNER  
WT-4820  
ANT  
A
ANT  
B
PEAK  
CHANNEL  
VOLUM  
E
10  
ANT  
A
B
T
UNER  
ANT  
1
PE  
A
K
CHANNEL  
VOLUM  
E
10  
T
UNER  
2
DIV  
E
R
SI  
T
P
Y
O
WIR  
W
E
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L
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T
U
T  
-482  
0
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/600(+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 .  
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 , 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 k, 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 , unbalanced.  
Outputs the tuner module 2 signal.  
17. Antenna A output connector  
BNC jack, 75 .  
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 , 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 .  
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
A
N
T
A
N
T
A
B
P
E
AK  
C
H
V
A
N
O
L
N
EL  
U
M
E
0
10  
A
A
P
N
N
E
T
T
A
B
TU  
NER1  
AK  
C
H
V
A
N
O
L
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EL  
U
M
E
0
1
0
TU  
NE  
R2  
3
2
4
1
5
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6
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E
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DI  
8
W
V
D
9
ERSIT  
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A
B
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o
O
8
0
P
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WE  
0
W
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N
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r
IR  
N
F
I
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p
R
A
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o
r
a
P
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S
D
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M
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t
io  
B
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ESS  
L
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n
F
D
A
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T
A
TUN  
IW  
A
N
ER  
WT  
-48  
20  
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/600(+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/600(+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/600(+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
P
N
N
E
T
T
A
B
A
K
C
H
V
A
N
O
L
N
E
U
M
L
E
1
0
A
A
P
N
N
E
T
T
TU  
A
B
N
E
R 1  
A
K
C
H
V
A
N
O
L
N
E
U
M
L
E
1
0
TU  
N
E
R 2  
D
IV  
E
R
S
IT  
P
Y
O
W
W
O
O
IR  
N
E
R
E
L
E
S
S
T
U
N
E
R
W
T
-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
H
V
A
N
O
L
N
E
U
M
L
E
1
0
A
N
N
E
T
T
T
A
U
A
P
N
E
R 1  
B
A
K
C
H
V
A
N
O
L
N
E
U
M
L
E
1
0
T
U
N
E
R 2  
D
IV  
E
RS  
IT  
P
Y
O
W
W
O
IR  
N
E
R
E
LE  
O
A
S
N
S
T
T
T
A
B
U
N
AN  
E
P
E
-
AK  
4
8
C
H
2
0
V
A
N
O
L
NEL  
U
M
E
1
0
A
A
P
N
N
T
T
A
B
U
N
E
T
R 1  
EA  
V
K
C
HA  
O
N
N
L
U
E
L
M
E
1
0
T
UN  
E
R 2  
D
IV  
E
R
S
IT  
PO  
W
E
Y
W
O
O
IR  
N
R
E
LE  
S
S
T
U
N
-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
0
C H  
A
N N E  
L
V
D
O L U M  
I
V E R S  
P E  
E
A
K
I
T
Y
W
A
N T  
I R E L  
B
E S  
A N T  
S
A
T
U
T
U N E  
N E R  
W T  
2 R  
O F F  
O
-
4
C
H
8
2
A
0
N N E  
N
L
P
O
W E  
R
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 k, unbalanced, phone jack  
Audio Output  
Mixing/Solo 1 (selectable):  
20 dB*2 (+6 dB*2 Max.), 600 , unbalanced, phone jack  
14 dB*2 (+12 dB*2 Max.), 600 , balanced, XLR-3-31 type connector  
Solo 2: 20 dB*2 (+6 dB*2 Max.), 600 , unbalanced, phone jack  
75, BNC (phantom powering for antenna), 9 V DC, 30 mA (max)  
75, 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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