Verizon TV Receiver WT 781 User Manual

OPERATING INSTRUCTIONS  
WT-780  
WT-781  
WIRELESS TUNER  
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  
 
NOMENCLATURE  
[Top View]  
Antenna  
Peak Indicator  
Lights when excessive input into wireless microphone  
is input.  
Reception Indicator  
Lights when the unit receives a radio signal from the microphone.  
Power Indicator  
Lights when the power is supplied.  
[Front View]  
Volume Control  
Adjusts the output volume.  
Audio Output Connector  
—10 dBV/Output Impedance : 10 k unbalanced  
[Side View]  
DC IN (12V DC)  
Input terminal for external power supply.  
Connect the supplied AC/DC adaptor to this  
connector.  
— 3 —  
 
OPERATIONS  
(2) Set up the antenna vertically and stretch to its full length.  
(1) Connect the AC/DC adaptor  
to the DC input terminal and  
wall outlet.  
(3) Set the microphone power switch to ON.  
The reception indicator lights.  
(4) Adjust the volume control.  
*Note on peak indicator  
When the peak indicator lights frequently, your voice can be distorted at a microphone circuit. In such  
cases, move your mouth away from the microphone so that the peak indicator lights at a maximum  
level.  
If the microphone is equipped with a sensitivity control, adjust the control so that the level indicator  
lights when spoken loud.  
CONNECTIONS  
When using with the 900 series amplifiers, connect the output of WT-780 (WT-781) with the following  
modules of 900 series.  
900 series module  
AC/DC  
adaptor  
900 series amplifiers, etc.  
— 4 —  
 
INSTALLATION PRECAUTIONS  
Install the unit at the location accessible to the wall outlet easily.  
Install the tuner away from high frequency noise generating equipment such as fluorescent lamps  
and personal computers, whenever possible.  
Avoid installing a receiving antenna in close proximity to the steel frames of the building or lockers.  
The clearance between the antenna and the wall needs to be at least 30 cm (1 foot).  
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.  
For example : C = 160 MHz  
D= 170 MHz  
F = 190 MHz  
G = 200 MHz  
H = 210 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  
— 5 —  
 
SPECIFICATIONS  
WT-780 (for USA,UK,AUSTRALIA)  
WT-781 (for CANADA)  
Power Requirements  
120V AC, 60 Hz / 230-240V AC, 50 Hz / 240V AC, 50 Hz  
Supplied AC/DC adaptor must be used.  
3 W  
Power Consumption  
DC Input  
12V DC, 110 mA max.  
Receiving Frequency  
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 dB µ V(S/N : 75 dB/Deviation : 15 kHz)  
(S/N : 80 dB/Deviation : 40 kHz)  
Approx. 14 dB µ V  
Receiving Sensitivity  
Squelch Sensitivity  
Frequency Response  
Residual Noise  
Antenna  
100Hz~12kHz 2dB  
Less than 30 µ V(8 µ V : A-weight)  
Telescopic antenna  
Audio Output  
Operating Temperature  
Dimensions  
—10dBV, 10, unbalanced  
—10°C~50°C (14°F~122°F)  
140 X 31 X 108.4mm (5.51" X 1.22" X 4.27")  
Approx. 260g. (0.572 Ib.)  
Weight  
Finish  
Dark gray  
Overall System Performance (WT-780/WT-781 ,WM-270/WM-271)  
Transmission Distance 30~60m (100~200 feet)  
Dynamic Range (SNR) Better than 90 dB (102 dB : A-weight)(60 dB µ V, 15 kHz Deviation)  
Better than 95 dB (102 dB : A-weight)(60 dB µ V, 40 kHz Deviation)  
Distortion  
Under 1%  
*Specifications are subject to change without notice.  
Accessories  
1
AC/DC adaptor  
AD-780 120V AC 60 Hz (USA,CANADA)  
AD-781 230-240V AC 50 Hz (UK)  
AD-782 240V AC 50 Hz (AUSTRALIA)  
Operating instructions  
1
TOA Corporation  
 
KOBE, JAPAN  
133-07-057-4A  

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