Toa WM-320 Bedienungsanleitung

INSTRUCTION MANUAL

TOA WIRELESS MICROPHONE model WM-320

- 1 -

GENERAL DESCRIPTION

The TOA WM-320 is a crystal controlled lavalier-pocket type wireless microphone

designed for operation on a specific frequency from 30MHz to 50MHz.

FEATURES

1. Weighing only 106g, the high-performance transmitter is small enough to fit into a

pocket or clip on to a belt, offering complete freedom of movement. The lavalier

microphone permits its user to speak without paying much attention to the

microphone.

2. The transmitter can accept almost any microphones because of its input sensitivity

adjustment control and a detachable connector supplied with 4.5V phantom power.

3. Three (3) "AAA" size alkaline batteries power the WM-320 continuously for 30 hours.

4. Adoption of crystal controlled direct frequency modulation system keeps the oscil-

lation frequency stable against the change of ambient temperature or voltage

fluctuation.

5. Dynamic range can be greatly increased, without incorporating compressor and

expander, for the pickup of audio signals from a quiet whisper to a full "lung

power" without overmodulation and distortion. Its unique circuit design also

assures the excellent signal-to-noise ratio.

6. Two (2) LED's are provided for easy-to-see monitoring of the battery consumption.

7. A built-in AGC circuit acts only for excessive input, suppressing a distortion

spontaneously. The AGC does not act for normal input, enabling the WM-320 to

9. Switching noise produced when turning switch on and off is extremely low, virtually

raising no problem for practical use.

FREQUENCY RESPONSE CURVE

The frequency response has been measured by using a microphone capsule, originally

included in the WM-320 package, with the WT-720 receiver, and also by providing a

sinewave of 94dB SPL from a point 50 cm distant from the microphone head.

provide the same performance as that of the "wired" microphone.

8. The transmitter is provided with a STAND-BY switch to silence the receiver while

the transmitter power switch is OFF. The STAND-BY switch is independently mounted

inside the transmitter lest it is accidentally turned off during use.

SPECIFICATIONS

Nominal carrier frequency:

Frequency stability:

Modulation system:

RF output power:

Radiated output power:

Harmonic and spurious

output power:

Radiated harmonic

and spurious power:

Pre-emphasis:

Deviation:

Modulation sensitivity:

Max. input S.P.L.:

Frequency characteristics:

Distortion:

S/N ratio:

Microphone element:

Ambient temperature range:

Antenna:

Operating voltage range:

Battery:

Battery life:

Dimensions:

Weight:

Type approval No.:

One of 36.7MHz, 37.1MHz and 37.9MHz

Less than ± 10kHz

Crystal controlled direct frequency modulation

40mW

Less than 1mW

Less than 4nW

75usec.

Maximum ± 80 kHz

1.7kHz at 82dB SPL (0dB=lV/uBar.)(at fm=lkHz)

115dB SPL (0dB=lV/uBar.)(at fm=lkHz)

70Hz to 12,000Hz ± 3dB

Less than 0.8%

Better than 86.5dB

Electret condenser microphone

10°C to 40°C

Whip, 78cm long

3.5V

4.5V

3 pcs. of LR03 (size AAA) or equivalent

Approx. 30 Hours

When alkaline batteries are used.

56 (W) x

95.5

(H) x 18 (D) mm

(2.2

x 3.8 x

0.7")

106g (0.23 lbs) (Batteries are included.)

M-88/83 for FTZ*

*FTZ: Fernmeldetechnisches Zentralamt (German Telecommunications Central Office).

- 2 -

PART DESCRIPTION

2. LED lamp (red)

3. LED lamp (green)

10. Microphone

11. Wind screen

12. Wire aerial

The WM-320 employs the cross-over battery check system which permits easy-to-see

monitoring of the battery status with 2 LEDs (green and red). The brightness of

both LEDs changes as shown below.

Brightness

of LED

Green LED

Red LED

It is possible to use unit continuously for another 5 hours after the red LED comes

on. When it lights more brightly than the green LED does, it signals the time that the

battery needs replacement (only 2 hours is available for use until the battery

capacity is exhausted).

The battery voltage is not stabilized for first several minutes after the power switch

is turned on. So, perform the checking of the LED lighting several minutes after power

is switched on. Also, if the red LED is illuminated more brightly than the green LED

when the power switch is turned off, you should replace the battery with the new one.

The transmitter is made to give up to 30 hours of continuous operation from an

alkaline battery.

- 3 -

9. Tie clip

5. Microphone connector

4. Power switch

1. Aerial connector

6. Transmitter case

8. Belt clip

7. Battery cover

LED TO CHECK BATTERIES, AND TIME FOR REPLACING BATTERIES

Balance of battery capacity

Time left over for further use of the

battery

52(h) --

LOADING BATTERIES

1. To open a battery cover, slide it in the direction pointed by the arrow in an

illustration.

2. Mount correctly 3 "AAA" size batteries according to the polarity indication marked

inside unit.

1. Confirm that microphone frequency matches receiver frequency.

2. Place a screw-in aerial supplied as free accessory on to an aerial connector.

3. Set the microphone switch to ON, and confirm that a green LED lamp comes on.

4. With the microphone in a designated area, adjust a sound volume control of the

receiver lest a howling should occur.

5. Turn the microphone switch off after use and confirm the LED lamp goes out. In the

event that the LED lamp still remains lit, refer to the next section, "Using the

STAND-BY switch".

While the

STAND-BY Switch

Sensitivity Control (SENS)

microphone switch is OFF, the corre-

sponding receiver can be operated by noise or

other radio waves and as a result, it produces

unwanted sounds. The STAND-BY switch is used to

prevent this phenomenon. For normal use of the

microphone, place the STAND-BY switch in the OFF

position. Setting it to the ON position supplies

power to the transmitter, putting the transmitter

in the transmission mode regardless of whether or

not the microphone switch is ON. The voice

signals may or may not be allowed to go through

by placing the microphone switch in the ON or OFF

position. Turn off both the STAND-BY and the

microphone switch after use, and confirm that the

LED lamp goes out.

Precautions for use of battery

* Be sure to use "AAA" size batteries. Avoid to

use the new and the nearly exhausted batteries

altogether as this may shorten an operating

time remarkably.

* Remove the batteries if unit is to be stored

for over 10 days. This will prevent any damage

a defective "leaking" battery may cause.

USING THE STAND-BY SWITCH

OPERATION

- 4 -

CONNECTION OF THE MICROPHONE CONNECTOR

The WM-320 contains a transmitter and a mic in one package and is designed for the

transmitter to accept any microphones by changing the wiring inside the connector. A

table given below shows the change in wiring for each type of microphone you wish to

use.

Adjust an input sensitivity adjustment control according to sensitivity of the micro-

phone you use. The input sensitivity adjustment control is already adjusted to the

microphone included in a package.

A: +B (4.5V) DC Power

B: Electret Mic Power Supply

C: Signal Input for Condensor Mic

D: Signal Input for Dynamic Mic

E: -B (Earth) DC Power

Signal

Earth

3-wire Condenser Mic

Flat

C&D

Low-cut

2-wire Condenser Mic

Flat

C&D

Low-cut

Short circuit A and B

Dynamic

Mic

TIE-CLIP

Fit a clip holder to the mic head along a slot on the mic head. It is possible to

direct the clip toward left hand side or right hand side, whichever you like.

1. Signal dropouts (momentary losses of reception) and noise may be suddenly

encountered in a certain area as the user holding the microphone moves. These

problems are caused by reflection and/or absorption of the transmitted radio waves

by the walls or other objects. In such a case, change the locations of the micro-

phone and receiver (receiving aerial).

2. Do not drop the microphone on a hard concrete floor, nor strike the microphone head

front with a fist or fingers, nor blow a breath strongly into the microphone head

front. Also, avoid to use the WM-320 in areas of high humidity and high temperature

as this could lead to the damage of the microphone.

- 5 -

USER CARE

WIND SCREEN

Placing a wind screen over the mic head eliminates the "pops" from explosive breath

sounds or from wind sounds, resulting in articulate sounds of voices.

BELT CLIP

Attach it to a belt.

Toa Electric Co., Ltd.

KOBE, JAPAN

133-07-009-1

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