Toa WT-770 User manual

WIRELESS TUNER
OPERATING INSTRUCTIONS
WT-770
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.
TOA Corporation

GENERAL DESCRIPTION
The TOA WT-770 is a VHF high band tuner that permits simultaneous use of up to two optional
wireless tuner modules WTU-770 and WTU-771. To ensure its reliability, the WT-770 employs a
compressor/expander system noise reduction circuit to minimize the influence of hight-frequency
noise generated from digital equipment such as personal computers and word processors as well as
a combined noise/tone squelch circuit.
HANDLING PRECAUTIONS
Check for proper operating voltage of your tuner before use.
The model WT-770 "L" is intended for operation on 120V AC/60 Hz, and the WT-770 "H" for
220~240V AC/50 Hz.
When using a component rack, avoid installing the unit above heat generating equipment such as a
power amplifier.
To avoid severe electrical shocks and possible catastrophic damage, never open the unit nor touch
its internal components.
To clean the unit's exterior, wipe with a soft dry cloth. Never use benzine, thinner, or other solvents,
which may damage the painted parts of the unit.
FEATURES
A tone squelch prevents disturbing radio signals from producing noise when the wireless
microphone is not in use.
Modular construction facilities channel expansion and frequency changes.
Space-saving design and simultaneous dual channel operation.
Rack mountable. (Optional brackets required.)
Wide dynamic range and less susceptibility to high frequency noise in space thanks to a
compressor/expander circuit.
–2–

NOMENCLATURE
Power Switch
Press this switch to turn power on. To turn power
off, press this switch again. Power Indicator lights
when the power is switched on.
Power Indicator
Tuner Receptacle
Insert an optional tuner module WTU-770 or WTU-
771.
Volume Control
Adjusts the output volume.
Reception Indicator
Lights when the tuner receives the RF signal.
Level Indicator
Lights in proportion to the intensity of input into a
wireless microphone.
Frequency Label
Attach the label (supplied with the WTU-770 and
WTU-771)to the unit.
Blank Panel
Antenna Connector
(BNC, 75 , Phantom Power Ouptut : 9V DC)
Connects to an optional wireless antenna, and
supplies DC power to the YW-620 having a built-in
booster amplifier.
Audio Output XLR Connector
( – 6 0 dBV, Output Impedance : 600 , Balanced)
Provides individual outputs of built-in tuner
modules.
Mixing Output
Line Output : 0 dBV, Output Impedance : 10 k ,
Unbalanced
Mic output : –6 0 dBV, output impedance : 600 ,
Unbalanced
Mixes built-in tuner module outputs.
Mixing Output Level Selector
Switches mixing output levels.
Line Output : Connects to the line (AUX) input
terminal of connected component.
Mic Output : Connects to the mic input terminal of
connected component.
DC IN (12V DC)
Power input terminal for external DC power supply.
AC Inlet (3 pins)
Power input terminal for AC power supply. Use the
supplied power cord.
[Rear Panel]
[Front Panel]
–3–

TUNER MODULE INSTALLATION AND REPLACEMENT
CAUTION
These servicing instructions are for use by qualified personnel only. To avoid electric shock do
not perform any servicing other than that contained in the Operating Instructions unless
you are qualified to do so. Refer all servicing to qualified service personnel.
1. New Installation
Press the stopper of the tuner
panel with a screw driver.
Open the tuner panel.
Insert a tuner module.
Pull the tuner panel towards
you while pressing the stopper.
After checking to confirm the
tight connection of the tuner
panel connector, fit the tuner
panel in place.
Attach the frequency label
supplied with the tuner module
to the assigned space.
After the frequency label has
been attached, make sure to
attach a color identification
label on it.
Color Identification Label
Attach one of the supplied labels of different colors to the tuner's panel. (Both the tuner and its
corresponding hand-held microphone have to be marked with the same color for easy association
with their frequencies.)
2. Installation (Expansion)
The tuner module WTU-770 or WTU-771 and the tuner panel WP-760 are required.
(1) Remove the blank panel of the unit.
(2) Attach the unit's connector to the tuner panel connector.
(3) Insert a tuner module (WTU-770 or WTU-771).
(4) Fit the tuner panel in place.
(5) Attach the frequency label supplied with the tuner module.
3. Replacement
Pull out the tuner module with long nose radio pliers.
[Note] Be sure to refer the installation and replacement to qualified service personnel.
D1234
–4–

OPERATIONS
Set the wireless microphone's power
switch to ON. The corresponding
module's reception indicator lights.
Switch the power on. The
power indicator lights.
Adjust the volume control of the module of which reception indicator lights.
The level indicator lights depending on the intensity of input into the wireless microphone, regardless of the
volume control setting. When the indicator lights red frequently, your voice can be distorted at a microphone
circuit. In such cases, move your mouth away from the microphone so that the indicator lights yellow at a
maximum level. This is not needed if the indicator lights red only occasionally.
If the microphone is equipped with a sensitivity control, adjust the control so that the level indicator lights yellow
when spoken loud.
CONNECTIONS
When using with the 900 series amplifiers, connect the output of WT-770 with the following modules of
900 series.
Wall-mount dipole Mobile wireless Whip wireless
wireless antenna antenna antenna
YW-620 YW-610 YW-600
YW-600 : Direct mount type to the tuner. Requires no antenna cable.
YW-610 : Mobile type antenna. Antenna cable must be under 10 m (33 feet) in length.
YW-620 : Fixed mount type antenna having a built-in booster amplifier
Wireless microphones can be used in wide ranges.
Phone Jack : Mic modules
AUX modules
XLR : Mic modules
900 series amplifiers, etc.
–5–

INSTALLATION PRECAUTIONS
Install the tuner, antennas, and antenna cable away from high frequency noise generating
equipment, such as fluorescent lamps and personal computers, whenever possible.
Avoid installing receiving antennas in close proximity to metal stuff, such as steel frames and
lockers. Install receiving antennas at least 30cm (1 foot) away from the wall.
Coaxial cable's high frequency loss increases as frequencies become higher. Keep the connection
cable between antenna and tuner as short as possible.
Maximum Antenna Cable Length
RACK MOUNTING
Optional mounting kit is required for rack mounting. Remove rubber supporters from the equipment.
1. Mounting one unit in a rack. (Optional mounting kits MB-14 and BK-014B are to be used.)
2. Mounting two units in a rack. (Optional mounting kits MB-14 and J-700 are to be used.)
Flat head screw (M3X6)
included in J-700
Fiber washer
(Supplied with the MB-14)
3X16 tapping screw
(Supplied with the MB-14)
Mounting screw (Supplied with the MB-14)
3X16 tapping screw
WT-770
WT-770
Cable type
RG-59/U
RG-6U
External diameter
6.1 mm (0.24")
7.4 mm (0.29")
Max. length
(when YW-620 is used.)
48m (160ft.)
48~70m (160~230 ft. )
Fiber washer
(Supplied with the MB-14)
Mounting screw (Supplied with the MB-14)
3 x 1 6 tapping screw
(Supplied with the MB-14)
WT-770
3 x 1 6 tapping screw included in BK-014B
3 x 1 6 tapping screw
BK-014B
–6–

ADDITIONAL EXPLANATIONS
1. Squelch Circuit
In a receiver employing only a noise or carrier squelch, the squelch circuit is actuated and provides the
output whenever the receiver receives the same RF carrier as a receiving frequency. This causes even
a disturbing radio signal to be received provided its frequency is the same as the receiving frequency.
As a result, it can happen that sound is suddenly heard from the speaker due to disturbing radio signal
even when the wireless microphone's power switch is left OFF.
The squelch circuit of TOA's wireless systems consists of both the tone and noise squelches, and is not
actuated if only same RF carrier as the receiving frequency is received. It is so designed as to be
actuated and output a signal only when the received RF carrier contains a very exact pre-determined
tone frequency component. Therefore, disturbing radio signals are rejected and the speaker can be kept
completely quiet when the wireless microphone's power switch is set to OFF, ensuring reliable use in
every application.
2. Frequency Indicators
Component frequency ratings are expressed in combinations of alphabetic and numeric characters, with
letters substituted for all numbers to the left of the 1 MHz digit.
C = 160 MHz
D = 170 MHz
E = 180 MHz
All numbers to the right of the 10 MHz digit are still expressed as numerals.
Therefore : D5432 = 175.432 MHz
G7654 = 207.654 MHz
BLOCK DIAGRAM
CH 1 OUTPUT
—60dBV, 600
BALANCED
(XLR TYPE)
CH 2 OUTPUT
—60dBV, 600
BALANCED
(XLR TYPE)
MIXED
OUTPUT
(Phone Jack)
dBV, 600
ANT. IN
DISTRIBUTER
TUNER 1
TUNER 2
VR 1
VR 2
ATT.
0 dBV, 10k
F = 190 MHz
G = 200 MHz
H = 210 MHz
For example :
–7–

SPECIFICATIONS
WT-770
Power Requirements
Power Consumption
DC Input
Antenna Input
Audio Output
Mixing Output
Operating Temperature
Dimensions
Weight
Finish
120V AC, 60 Hz ("L" version)
220~240V AC, 50 Hz ("H" version)
8 W (when 2 WTU-770's or WTU-771 's are mounted)
12~18V DC, 250 mA max.
75 ,BNC
Power supplied to antenna : 9V DC, 30mA max.
–60 dBV, 600 , balanced
LINE : 0 dBV, 10k , unbalanced
MIC : –60 dBV, 600 , unbalanced
–10°C~50°C (14°F~122°F)
210 × 47.5 × 280 mm (8.3" × 1.9" × 1.0")
Approx. 2.2 kg (4.91 Ib.)
Panel : black
Module and blank panel : resin (black)
WT-770 equipped with WTU-770 or WTU-771
Receiving Frequency
Receiving Sensitivity
Squelch Sensitivity
Frequency Response
Residual Noise
169.445 MHz~171.905 MHz (FCC Part 90/USA)
174.250 MHz~215.250 MHz (FCC Part 74/USA,D.O.C/CANADA)
173.8 MHz~175.0 MHz (MPT1345/UK)
202.1 MHz~203.7 MHz (DOC 60/AUSTRALIA)
Under 20 dBµV(S/N : 75 dB/Deviation : 15 kHz)
(S/N : 80 dB/Deviation : 40 kHz)
Approx. 14 dBµV
100 Hz~12 kHz ±2dB
Less than 30µV (8µV : A-weight)
Overall System Performance (WT-770,WTU-770/WTU-771,WM-270/WM-271)
Transmission Distance
Dynamic Range (SNR)
Distortion
30~100m (100~330 feet)
Better than 90 dB (95 dB : A -weight)(60 dBµV, Maximum Deviation)
Under 1 %
Specifications are subject to change without notice.
Accessories
Power cable
DC input connector
Color identification labels
Operating instructions
Warranty card
TOA Corporation
KOBE, JAPAN
133-07-072-70
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