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[Operating Instructions]
WIRELESS
MICROPHONE
WM-270
WM-271
Please fo llo w th e instructions in this manual to obtain
the optimum results from this unit. We also recommend you keep this manual handy for future reference.
GENERAL DESCRIPTION
Compact and light weight, the TOA WM-270
(WM-271) is a hand-held type wireless microphone for
speech. It incorporates 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.
FEATURES
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.
Anti-rolling construction.
Stopper to prevent the fal l of a battery case.
Compressor/expander system noise reduction circuit.
USE R PRECAUTIONS
Take care not to dro p 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 d etergent, and then
dry with a soft cloth.
Never use thinner, benzine, or other solvents, which
may damage plastic part o f the unit.
Remove the battery if the unit is to be stored f or two
weeks or more.
TOA Corporation
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BATTERY LOADING
Us e LR6 type alkaline battery.
1. Hold the microphone body and rotate t he microphone grip anticlockwise. (Fig. 1) The microphone
grip is so designed that it can not be completely
removed from the body because the battery grip
past the lock point as damage may occur.
Microphone head
Body
Grip
2. Observing correct polarity instructed inside the
battery compartment, insert a battery. (Fig. 2)
Name plate
(Color identification label)
3. Replace the microphone grip by sliding the grip
upward and hand tightening the grip in a clockwise
position.
HOW TO USE
1. Ver if y tha t t he receiver fr equency is identical with
the microphone (transmitter) frequency.
2. Set the microphone on/off switch to ON, and verify
that the green battery indicator lights.
3. Set the on/off switch to OFF after use and verify
that the green LED is extinguished.
BATTERY REPLACEMENT
1. Th e alkaline battery LR6 can be continuously used
for approximately 12 hours. (The manganese
battery R6 fo r approximately fo ur hours.)
2. Battery indicator
When the battery voltage is sufficient, the green
LED lights. The green LED becomes dim mer as
the battery voltage drops, and the red LED lights.
In such a case, renew the alkaline battery LR6
inside an hour or two (renew the manganese
battery R6 inside a half hour.).
Fig.
1
Fig.
2
Fig.
3
Red LED
Green LED
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TIPS FOR CONVENIENT USE
1. Strength and direction of a radio signal to be
transmitted from the wireless microphone change
depending on the part of the microphone body to
be held by the hand. To prevent this, hold the
upper part of th e body.
2. To aviod feedback, use the microphone with your
mouth put as close to the microphone top as
possible (2" o r 5 cm).
3. 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 acutally used.
4. To prevent radio interference or malfunction of the
tuner, always use the microphone at least 3 m (10
feet) away from a receiving antenna.
5. 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.
6. Walls, floors, and ceilings block the radio wave's
straigh-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.)
7. 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.
8. Once a wireless system is installed, actually move
around the site w it h a microphone t o check system
operation.
9. Color Identification Labels
Identification labels of different colors are supplied
with the wireless microphone to simplify confir-
mation of microphone frequencies when multiple
microphones are in use. Attach one of the labels to
the microphone. In this event, both t h e microphone
and its corresponding receiver need to be in the
same color scheme fo r easy association with th eir
frequencies.
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 th e 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.
Unit: mm (in)
Battery indicator
Power switch
Body
Grip
PART NAME
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, dusturbing 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.
Microphone head
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TYPICAL FREQUENCY RESPONSE
FREQUENCY IN HERTZ
REPLATIVE
RESPONSE
IN dB
FCC license requirement
The operation of the TOA wireless microphone systems 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.
D.O.C. (CANADA) license requirement
The Department of Communication (D.O.C.) recommends wireless microphones operating in the 174 ~
216 MHz band be licensed on the following basis:
1) on a no-protection non-interference basis;
2) frequencies shall be selected and assigned form
within television channels 7 to 13 (174 ~ 216 MHz);
3) operational areas shall be restricted to locations
that are at least 8 miles outside the Grade B
contour of television stations that operate on the
channel in which the frequency assignment falls;
4) location of operation to be shown on license; and
5) licenses shall resolve interference complaints that
result from micr ophone operation.
SPECIFICATIONS
Specifications are subjects to change without notice.
Versions
Regulations
Carrier Freq. Range
Freq. Stability
RF Carrier Power
Effective Radiated Power
Maximum Input Level
Modulation (Max.)
Tone Freq.
Controls
Battery
Current Drain
Battery Life
Battery Indicator
Antenna
Ambient Temperature
Colour
Dimensions
Weight
Accessories:
Microphone holder ·········· 1
Color identification labels ······ 1
Operating instructions ········ 1
TOA Corporation
KOBE, JAPAN
133-07-063-70
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