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GENERAL DESCRIPTION
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.
TOA WIRELESS MICROPHONE
model
WM-220
1
INSTRUCTION MANUAL
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Summary of Contents for Toa WM-220
- Page 1 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.
- Page 2 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:...
- Page 3 9. Microphone holder LED TO CHECK BATTERIES, AND TIME FOR REPLACING BATTERIES 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.
- Page 4 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.
- Page 5 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. Removing the wind-screen 1. Insert the protrusion of a mic clip into a cut through a round mic guard. Protrusion WM-220...
- Page 6 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.
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