Wireless Tuner WT-740U

Operation Instructions
WIRELESS TUNER
WT-740U
The WT-740U wireless tuner has been manufactured for use with a VHF high band
system. When equipped with the WTU-740U tuner module (optional), it permits
reception of up to two different frequency channels.
CAUTION RISK OF FIRE OR ELECTRIC SHOCK. UNIT NOT INTENDED FOR USE WITH
EXTERNAL ANTENNA.
Part Names And Functions
Front panel
Tuner module port
The WTU-740U tuner module (optional)
is inserted into this port by a qualified
service personnel.
Volume control (VOL1 and 2)
These volume controls adjust the sound
volume of the wireless microphones.
Reception indicator
The indicator comes on when the
antenna receives a signal.
Power indicator lamp
The lamp is illuminated when turning
power on.
Frequency label
Attach here the frequency label
supplied with the WTU-740U
wireless tuner module (optional).
Power ON-OFF switch
Press the switch to turn power on. To
turn power off, press the switch again.
Part Names And Functions
Rear panel
Mixing input jack
Connects this jack to the 0 dBv, 600
ohms, unbalanced output jack of
another WT-740U.
Antenna input connector
(BNC, 75 ohms)
Connects to an optional dipole antenna
"YW-450U" or an optional whip antenna
"YW-460U"
Mixed output level selector
This switch changes over the mixing
output level.
MIC : -65 dBv
LINE: 0 dBv
Mixed output jack
Individual output jacks
OUTPUT IMPEDANCE 600 ohms,
0 dBv, OUTPUT IMPEDANCE 600
ohms, UNBALANCED.
UNBALANCED.
The output signals from the tuner
modules 1 and 2 are all mixed and
provided from this jack. The output level
can be selected with the mixing output
level selector.
Each individual output signal from the
tuner modules 1 and 2 can be provided
from this jack.
Mounting The WTU-740U Tuner Module
CAUTION: The setting of the tuner module WTU-740U has to be
done by a qualified service personnel.
1. Press the stopper of the tuner
3. Open the tuner panel.
4. Insert a tuner module.
panel with a screw driver.
2. Pull the tuner panel towards
you while pressing the stopper.
5. After checking to confirm the
tight connection of the tuner
panel connector, fit the tuner
panel in place.
6. Attach the frequency label
supplied with the tuner module
to the assigned space.
Connections
When using with the 900 series amplifiers, connect the
output of WT-740U with the following modules of 900 series.
If more tuner units are required.
YW-460U
YW-450U
To LINE (AUX) input jack of connected
equipment. (Each individual output signal from
the tuner modules 1 and 2 can be provided.)
Set the mixing output
level selector to LINE position.
Mic level mode of Mixed output jack
(-65dBv, 600 ohms, unbalanced)
: M-01, M-11, M-21, M-51 & M-61.
YW-450U
YW-460U
Individual output jack
(0 dBv, 600 ohms, unbalanced)
: U-01, U-11, U-12, U-21 & U-61.
Line level mode of Mixed output jack
(-0 dBv, 600 ohms, unbalanced)
: U-01, U-11, U-12, U-21 &U-61.
And this output also can be connected with the
input jack for BG-10 & A-901A or direct input
terminal for P-906A, P-912A & P-924.
Operation
2. Set the wireless microphone switch to on. Either of the two LED
indicators on the tuner module with the same frequency as that
of the wireless microphone comes on.
1. Turn power on, and the power
3. Adjust the volume with the volume control of which LED indicator is
burning. If the volume control is set at 7 or more, the sound may be
distorted when spoken loudly into the wireless microphone.
indicator lamp comes on.
Installation Of Antenna
Install the receiving antenna, tuner and connection cables, as far away as possible from such equipment
that generates radio frequency noise as cars, fluorescent lamps and computerized equipment.
Do not install the antenna near the steel-made staff and like a lockers. And keep the antenna away from
the wall more than 2 feet (60 cm)
If the distance between the wireless microphone and the receiving antenna is 60 to 100 feet (20 to 30 m),
the radio wave can be received in good condition when the system uses a single antenna. Therefore,
install the antenna within 100 feet (30 m) from the wireless microphone. (The YW-460U should be
installed within 50 feet (15 m) from the wireless microphone.)
To minimize cable losses, do not extend connection cables longer than necessary.
Specification of the co-axial cable
TYPE NUMBER
RG-59/U
NOMINAL OUTER DIAMETER
0.24 inch (6.1 mm)
200 ft
MAXIMUM LENGTH
RG-6/U
0.29 inch (7.4 mm)
200 to 260 ft
Modifying The Output Connector To Balanced Type
NOTE: This modification is sololy intended for a qualified service personnel.
EXPLODED VIEW
Before starting the modification, arrange for input
transformers Model IT-437 (optional).
1) Be sure to unplug the power cable from the wall
AC outlet.
SOLDER THE NAILS.
2) Unscrew the unit's top cover and remove the PC
board from the chassis.
3) Cut or insert and solder the jumper in accordance
with following table.
IT-437
4) Mount the IT-437 as shown below and solder the
lead wire and nails.
IT-437
MOUNT
POSITION
BROWN
ORANGE
JP1-1 (JP111)
T101
RD1-1
JP2-1 (JP109)
T102
RD2-1
T103
T104
IN/OUTPUT
CUT JUMPER
INDIVIDUAL 1
INDIVIDUAL 2
MIX OUTPUT
JP3-1 (JP104)
JP3-3 (JP123)
MIX INPUT
JP4-1 (JP122)
INSERT &
SOLDER
JUMPER
LEAD WIRE SOLDERING POSITION
YELLOW
BLUE
RD1-2
RD1-3
RD1-4
RD2-2
RD2-3
RD2-4
RD3-1
RD3-2
RD3-3
RD3-4
RD4-1
RD4-2
RD4-3
RD4-4
2)
*
JP3-2 (JP102)
*1) Remove the JP4-1 (JP122) clearly.
*2) Use tinned wire or the removed jumper wire JP3-1 for JP3-2 (JP102).
Specifications
Power supply:
Power consumption:
Antenna input:
Maximum output:
Individual channel output:
Mixing output:
Temperature range:
Dimensions (WxHxD):
Weight:
Color and finish: Panel:
Tuner receptacle cover
(module front):
Standard accessory:
Overall receiver (WT-740U
Receiving sensitivity:
Squelch sensitivity:
Signal to noise ratio:
Residual noise:
Distortion:
120V AC, 60 Hz
7 W (using with WTU-740U 2 units)
75 ohms, BNC jack
12 dBv
0 dBv, 600 ohms, unbalanced
LINE: 0 dBv, 600 ohms, unbalanced
MIC:
-65 dBv, 600 ohms, unbalanced
14°F to 122°F (-10°C to 50°C)
8.3"x1.9"x10" (210x47.5x253 mm)
Approx. 4.6 Ibs (2.1 kg)
Grayish blue
Resin (grayish blue)
3'3" (1 m) cable with phone plugs x 1 ea.
AC power cable x 1 ea.
+ WTU-740U)
80 dB or more at input 20 dB/aV (Deviation 15 kHz)
Less than 17 dB/µV
Better than 90 dB (at input 60 dBµV/volume control in maximum position)
Less than 30µV
Less than 1 %
* Specifications are subject to change without notice
Printed in Japan
133-07-032-90