Toa WT-770 Manual de usuario

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

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.

DISTRIBUTER

TUNER 1

TUNER 2

VR 1

VR 2

ATT.

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

1 (only "L" version)

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