Toa WM-220 Instruction Manual
INSTRUCTION MANUAL
model WM-220
GENERAL DESCRIPTION
TOA WIRELESS MICROPHONE
Th e TO A 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 oscillation 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 o ff is extremely low, virtually
raising no problem for practical use.
FREQUENCY RESPONSE CURVE
Through the combination use o f 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.
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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
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
to
40°C
Whip, 78cm long
3.5V
to
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)
1 7 0g (0.37 l b s ) (Batteries are included.)
M-88/83 for FTZ*
WM—220
* FTZ: Fernmeldetechnisches Zentralamt (German Telecommunications Central Office).
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