TOA Electronics Microphone WM 370 User Manual

[Operating Instructions]  
Please follow the instructions in this manual to obtain  
the optimum results from this unit. We also recom-  
mend you keep this manual handy for future refer-  
ence.  
WIRELESS  
MICROPHONE  
GENERAL DESCRIPTION  
Compact and light weight, the TOA WM-370 is a  
lavalier type wireless microphone for speech. It  
incorporates a uni-directional electret condenser  
microphone to minimize feedback, and a com-  
pressor/expander system noise reduction circuit  
to minimize the influence of high-frequency noise  
generated from digital equipment such as  
personal computers and word processors.  
WM-370  
FEATURES  
Internal loop antenna.  
Small size, light weight and high reliability.  
Continuous operation for 12 hours or more on one  
alkaline battery (LR6/1.5V).  
Two battery indicators (green and red).  
Internal I.D. signal generator for tone squelch.  
Compressor/expander system noise reduction cir-  
cuit.  
USER PRECAUTIONS  
Take care not to drop the unit on to a hard floor.  
Do not flip nor blow into the microphone head.  
Avoid placing the unit in areas of extremely high  
humidity and temperature.  
Never open the unit nor touch its internal compo-  
nents.  
Clean the unit's exterior periodically with a soft dry  
cloth. If it gets very dirty, wipe first with a soft damp  
cloth lightly soaked in a neutral detergent, and then  
dry with a soft cloth.  
Never use thinner, benzine, or other solvents, which  
may damage plastic part of the unit.  
Remove the battery if the unit is to be stored for two  
weeks or more.  
MICROPHONE GAIN CONTROL  
Remove a battery to expose the control. Use a  
Philips screwdriver to adjust it.  
The sensitivity  
increases as the control is rotated clockwise, and  
decreases as rotated counterclockwise.  
leave the control intact.  
Usually  
Gain control  
TOA Corporation  
 
PART NAME  
TIPS FOR CONVENIENT USE  
1. To avoid feedback, use the microphone with your  
mouth put as close to the microphone top as  
possible.  
Microphone head  
2. Adjust the tuner volume control to an appropriate  
volume level that prevents feedback. The system is  
prone to feedback if the microphone comes too  
close to the speaker. It is suggested that tests be  
performed preliminarily of feedback points in loca-  
tions where the microphone is to be actually used.  
3. To prevent radio interference or malfunction of the  
tuner, always use the microphone at least 3m (10  
feet) away from a receiving antenna.  
4. When using multiple microphones simultaneously,  
separate them at least 60cm (2 feet ) from each  
other to prevent noise or break in sound, which  
may result from mutual microphone interference.  
5. Walls, floors, and ceilings block the radio wave's  
straight-line travel, and frequently create null spots  
that can cause temporary loss of signal reception  
even within the practical transmission distance  
threshold. In such cases, relocate a receiving  
antenna or change microphone locations. (To  
effectively reduce the null spots, use the diversity  
tuner instead of non-diversity tuners.)  
Microphone clip  
6. Human bodies absorb radio signals, and this can  
badly affect signal reception. In rooms having a  
number of people, attempt to install an antenna  
high above the floor.  
7. Once a wireless system is installed, actually move  
around the site with a microphone to check system  
operation.  
Power switch  
ADDITIONAL EXPLANATIONS  
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.  
Battery indicator  
The squelch circuit of TOA's wireless systems con-  
sists 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.  
Transmitter case  
Bell clip  
Battery enclosure cover  
Unit: mm (in.)  
 
FCC license requirement  
TYPICAL FREQUENCY RESPONSE  
The operation of the TOA wireless microphone sys-  
tems must conform with the rules and regulations  
contained in the code of Federal Regulations, 47,  
Telecommunications, Part 74 and Part 90. These  
regulations are available from the U.S. Government  
Printing Office.  
FREQUENCY IN HERTZ  
SPECIFICATIONS  
WM-370 US version  
FCC Part 74  
Version  
FCC Part 90  
Regulations  
174~216MHz  
0.005%  
169.445~171.945 MHz  
0.005%  
Carrier Freq. Range  
Freq. Stability  
RF Carrier Power  
Maximum Input Level  
Modulation (Max.)  
Tone Freq.  
15mW  
15mW  
115 dBspl  
40kHz Deviation  
15kHz Deviation  
32.768kHz  
Power ON/OFF  
LR6 (1.5 Volts) Alkaline  
90mA Typ. (1.5V)  
More than 12 hours  
Green and Red LED's  
Controls  
Battery  
Current Drain  
Battery Life  
Battery Indicator  
Antenna  
Internal Loop  
–10°C~50°C (14°F~122°F)  
Dark Gray  
Ambient Temperature  
Colour  
62×98×20.5mm  
(2.44" × 3.86" × 0.81")  
90g (0.198lbs.) with battery  
Dimensions (WxH x D)  
Weight  
*Specifications are subject to change without notice.  
Accessories:  
1
Operating instructions  
TOA Corporation  
Printed in Japan  
 
133-07-108-30  

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