Vizio WT-870 User Manual

OPERATING INSTRUCTIONS

DIVERSITY WIRELESS TUNER

WT-870

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

Designed for virtual elimination of problem "null spots" or "dropouts" (momentary loss of radio signal

reception), the TOA WT-870 is a diversity tuner that permits simultaneous use of up to two optional
wireless tuner modules WTU-870 and WTU-871. To ensure its reliability, the WT-870 employs a
compressor/expander system noise reduction circuit to minimize the influence of high-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-870 "L" is intended for operation on 120V AC/60 Hz, and the WT-870 "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

Diversity reception system minimizes the effects of fading during reception of a radio signal.

A tone squelch prevents disturbing radio signals from producing noise when the wireless microphone

is not in

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.

use.

– 2 –

NOMENCLATURE

[Front Panel]

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-870 or WTU-

871.

Volume Control

Adjusts the output volume.

[Rear Panel]

Reception Indicator

The left lamp lights when antenna A receives a
signal. The right lamp lights when antenna B

receives a signal.

Level Indicator

Lights in proportion to the intensity of input into a

wireless microphone.

Frequency Label

Attach the label (supplied with the WTU-870 and

WTU-871)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

(–60 dBV, Output Impedance : 600 , Balanced)
Provides individual outputs of built-in tuner
modules.

Mixing Output

Line Output : 0 dBV, Output Impedance : 10k

Unbalanced

Mic Output:–60 dBV, output impedance : 600
unbalanced.

Mixes built-in tuner module outputs.

,

,

– 3 –

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.