Toa WM-220 Bedienungsanleitung

INSTRUCTION MANUAL

model WM-220

GENERAL DESCRIPTION

TOA WIRELESS MICROPHONE

The TOA WM-220 is a crystal controlled hand-held type wireless microphone designed for

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

FEATURES

1. The WM-220 weighs just 170g and small (25.3 diameter x 167mm) enough to fit into a

shirt pocket.

2. Three (3) "AAA" size alkaline batteries power the WM-220 continuously for 30 hours.

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

lation frequency stable against the change of ambient temperature or voltage

fluctuation.

4. 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.

5. Human body-effect-free design assures dependable operation of the WM-220.

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-220 to

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

8. A non-glare finished microphone body is made of metal and can fit in one's palm.

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

raising no problem for practical use.

FREQUENCY RESPONSE CURVE

Through the combination use of the WM-220 and the WT-720 receiver, the frequency

response has been measured by providing a sinewave of 94dB SPL from a point 50 cm

distant from the microphone head.

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

Within 10kHz

Crystal controlled direct frequency modulation

40mW

Less than 1mW

Less than 4nW

75µsec.

Maximum ± 80 kHz

1.7kHz at 94dB SPL (0dB=1V/µBar.)(at fm=1kHz)

127dB SPL (0dB=lV/µBar.)(at fm=1kHz)

70Hz to 12,000Hz ± 3dB

Less than 0.8%

Better than 87dB

Unidirectional electret condenser microphone

10°C

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.

ø25.3 X 167 mm (ø1.0 x 6.6 inches)

170g (0.37 lbs) (Batteries are included.)

M-88/83 for FTZ*

WM—220

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

PART DESCRIPTIONS

WM—220

The WM-220 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 the

both LEDs changes as shown below.

Balance of battery capacity

Time left over for further use of the

battery

Brightness

of 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.

Green LED

Red LED

5 2 (h) --

LED TO CHECK BATTERIES, ANDTIME FOR REPLACING BATTERIES

3. Aerial

4. LED lamp (Red)

5. LED lamp (Green)

6. Power switch

2. Microphone housing

1. Microphone head

8. Clip

7. Metal wind screen

9. Microphone holder

WM—220

1. Turn a microphone housing counterclockwise holding a microphone head.

2. Pull the housing till a battery holder inside unit is exposed as illustrated. Now

that the housing is designed not to go beyond a stopper, do not further pull it

forcibly.

3. Insert correctly "AAA" batteries into the battery holder according to polarity

indication marked on the battery holder. The polarity is negative (-) at the coil

spring side, and positive (+) at the contact point side.

4. Fit the housing back in place.

* 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.

OPERATION

PRECAUTIONS FOR USE OF BATTERY

1. Confirm that microphone frequency matches receiver frequency.

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

3. When using the WM-220, the aerial should be hung vertically from the microphone.

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 that the LED lamp goes out.

- 4 -

Loosen

Fasten

LOADING BATTERIES

* To wear the microphone in a costume:

Attach a clip supplied as free accessory to clothing as illustrated, and the micro-

WM-220

For normal hand-held use, place it over the microphone head. This eliminates the

"pops" from explosive breath sounds or from wind sounds, resulting in the quality

sound of high intelligibility.

1. Insert the protrusion of a mic clip into a cut through a round mic guard.

Removing the wind-screen

Protrusion

* Metal wind screen

phone can clip on to a costume.

2. Turn the wind-screen

illustrated holding the protrusion tight with your

finger.

WM—220

Note: Insert the mic clip protrusion into the cut only when removing the wind-

screen. Leaving the protrusion inserted in the cut will make it impossible to

replace batteries, and also, will cause the damage of the protrusion.

USER CARE

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-220 in areas of high humidity and high temperature

as this could lead to the damage of the microphone.

3. When using, the aerial should be hung vertically from the microphone. Distorting or

bending the aerial in your palm can make a travelling distance of the radio waves

extremely short.

Toa Electric Co., Ltd.

KOBE, JAPAN

133-07-008-4

* To mount the microphone on a stand:

Mic Holder

W5/16 18-thread

Mic Stand

Inhaltsverzeichnis

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