Toa WM-3310 User manual

TOA RADIO MICROPHONE
model WM-3310
WM-3310H
Preliminary Information
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CONTENTS
1. GENERAL DESCRIPTION ............................................................................ 2
2. FEATURES ......................................................................................................... 2
3. SPECIFICATIONS ............................................................................................ 2
4. TEST CONDITIONS ......................................................................................... 2
5. APPEARANCE .................................................................................................. 5
6. BLOCK DIAGRAM ........................................................................................... 6
7. CIRCUIT EXPLANATION ............................................................................... 7
8. OPERATING INSTRUCTIONS .................................................................... 9

2
1. GENERAL DESCRIPTION
The TOA wireless microphone WM-3310 is of lavalier type and is designed to conform with the regulations.
It employs an optimized PLL-synthesizer and a compander noise reduction circuit to minimize the influence of
ambient RF noise.
2. FEATURES
(1) Up to 6 operating frequencies are made available for selection.
(2) An optimized PLL-synthesizer minimizes the oscillation frequency drift resulting from the ambient
temperature or voltage fluctuation.
(3) The sensitivity trim pot control optimizes the system in any locations.
(4) Battery lamp indicates battery consumption to prevent the unit from malfunctioning when the battery level
remarkably decreases.
(5) The compressor and low-pass filter on the audio circuit protect the unit against out-of-band energy
produced by overload.
(6) Chip components make the unit smaller in size yet more reliable.
(7) 6 frequencies of 169 - 216 MHz
3. SPECIFICATIONS
Model No. WM-3310
Oscillator Crystal-controlled PLL-synthesizer
Nominal Frequency 6 frequencies of 169- 216 MHz
RF Power Output Less than 50mW
Modulation Frequency Modulation
Nominal Supply Voltage 9.0V
Usable Battery 6LR61(9.0V Alkaline)
Marginal Battery Voltage Level Approx. 6 V (When the battery voltage falls below this level, the battery
lamp begins to flash.)
Antenna Wired Antenna
4. TEST CONDITIONS
(1) Modulation and Non-modulation
[Modulation]
To perform continuous modulation, connect the plug of the jig supplied with the microphone sample to CN1
and the jig output to an AF signal generator. Then, connect the jig output to an AF oscillator using the shielded
or coaxial cable. For connection, refer to the figure below.(Since the phantom power is present at the HOT
side of the plug, a capacitor to block a DC current is connected to the HOT side.)
2
1. GENERAL DESCRIPTION
The TOA wireless microphone WM-3310 is of lavalier type and is designed to conform with the regulations.
It employs an optimized PLL-synthesizer and a compander noise reduction circuit to minimize the influence of
ambient RF noise.
2. FEATURES
(1) Up to 6 operating frequencies are made available for selection.
(2) An optimized PLL-synthesizer minimizes the oscillation frequency drift resulting from the ambient
temperature or voltage fluctuation.
(3) The sensitivity trim pot control optimizes the system in any locations.
(4) Battery lamp indicates battery consumption to prevent the unit from malfunctioning when the battery level
remarkably decreases.
(5) The compressor and low-pass filter on the audio circuit protect the unit against out-of-band energy
produced by overload.
(6) Chip components make the unit smaller in size yet more reliable.
(7) 6 frequencies of 169 - 216 MHz
3. SPECIFICATIONS
Model No. WM-3310
Oscillator Crystal-controlled PLL-synthesizer
Nominal Frequency 6 frequencies of 169- 216 MHz
RF Power Output Less than 50mW
Modulation Frequency Modulation
Nominal Supply Voltage 9.0V
Usable Battery 6LR61(9.0V Alkaline)
Marginal Battery Voltage Level Approx. 6 V (When the battery voltage falls below this level, the battery
lamp begins to flash.)
Antenna Wired Antenna
4. TEST CONDITIONS
(1) Modulation and Non-modulation
[Modulation]
To perform continuous modulation, connect the plug of the jig supplied with the microphone sample to CN1
and the jig output to an AF signal generator. Then, connect the jig output to an AF oscillator using the shielded
or coaxial cable. For connection, refer to the figure below.(Since the phantom power is present at the HOT
side of the plug, a capacitor to block a DC current is connected to the HOT side.)
2
1. GENERAL DESCRIPTION
The TOA wireless microphone WM-3310 is of lavalier type and is designed to conform with the regulations.
It employs an optimized PLL-synthesizer and a compander noise reduction circuit to minimize the influence of
ambient RF noise.
2. FEATURES
(1) Up to 6 operating frequencies are made available for selection.
(2) An optimized PLL-synthesizer minimizes the oscillation frequency drift resulting from the ambient
temperature or voltage fluctuation.
(3) The sensitivity trim pot control optimizes the system in any locations.
(4) Battery lamp indicates battery consumption to prevent the unit from malfunctioning when the battery level
remarkably decreases.
(5) The compressor and low-pass filter on the audio circuit protect the unit against out-of-band energy
produced by overload.
(6) Chip components make the unit smaller in size yet more reliable.
(7) 6 frequencies of 169 - 216 MHz
3. SPECIFICATIONS
Model No. WM-3310
Oscillator Crystal-controlled PLL-synthesizer
Nominal Frequency 6 frequencies of 169- 216 MHz
RF Power Output Less than 50mW
Modulation Frequency Modulation
Nominal Supply Voltage 9.0V
Usable Battery 6LR61(9.0V Alkaline)
Marginal Battery Voltage Level Approx. 6 V (When the battery voltage falls below this level, the battery
lamp begins to flash.)
Antenna Wired Antenna
4. TEST CONDITIONS
(1) Modulation and Non-modulation
[Modulation]
To perform continuous modulation, connect the plug of the jig supplied with the microphone sample to CN1
and the jig output to an AF signal generator. Then, connect the jig output to an AF oscillator using the shielded
or coaxial cable. For connection, refer to the figure below.(Since the phantom power is present at the HOT
side of the plug, a capacitor to block a DC current is connected to the HOT side.)
2
1. GENERAL DESCRIPTION
The TOA wireless microphone WM-3310 is of lavalier type and is designed to conform with the regulations.
It employs an optimized PLL-synthesizer and a compander noise reduction circuit to minimize the influence of
ambient RF noise.
2. FEATURES
(1) Up to 6 operating frequencies are made available for selection.
(2) An optimized PLL-synthesizer minimizes the oscillation frequency drift resulting from the ambient
temperature or voltage fluctuation.
(3) The sensitivity trim pot control optimizes the system in any locations.
(4) Battery lamp indicates battery consumption to prevent the unit from malfunctioning when the battery level
remarkably decreases.
(5) The compressor and low-pass filter on the audio circuit protect the unit against out-of-band energy
produced by overload.
(6) Chip components make the unit smaller in size yet more reliable.
(7) 6 frequencies of 169 - 216 MHz
3. SPECIFICATIONS
Model No. WM-3310
Oscillator Crystal-controlled PLL-synthesizer
Nominal Frequency 6 frequencies of 169- 216 MHz
RF Power Output Less than 50mW
Modulation Frequency Modulation
Nominal Supply Voltage 9.0V
Usable Battery 6LR61(9.0V Alkaline)
Marginal Battery Voltage Level Approx. 6 V (When the battery voltage falls below this level, the battery
lamp begins to flash.)
Antenna Wired Antenna
4. TEST CONDITIONS
(1) Modulation and Non-modulation
[Modulation]
To perform continuous modulation, connect the plug of the jig supplied with the microphone sample to CN1
and the jig output to an AF signal generator. Then, connect the jig output to an AF oscillator using the shielded
or coaxial cable. For connection, refer to the figure below.(Since the phantom power is present at the HOT
side of the plug, a capacitor to block a DC current is connected to the HOT side.)
25 V 33MF capascitor to block
DC supply
To CN1
HOT
GND
To AF SG
or
1 k ohm R
<Fig. 1. Jig>
25 V 33MF capascitor to block
DC supply
To CN1
HOT
GND
To AF SG
or
1 k ohm R
<Fig. 1. Jig>
25 V 33MF capascitor to block
DC supply
To CN1
HOT
GND
To AF SG
or
1 k ohm R
<Fig. 1. Jig>
25 V 33MF capascitor to block
DC supply
To CN1
HOT
GND
To AF SG
or
1 k ohm R
<Fig. 1. Jig>
25 V 33MF capascitor to block
DC supply
To CN1
HOT
GND
To AF SG
or
1 k ohm R
<Fig. 1. Jig>
25 V 33MF capascitor to block
DC supply
To CN1
HOT
GND
To AF SG
or
1 k ohm R
<Fig. 1. Jig>
25 V 33MF capascitor to block
DC supply
To CN1
HOT
GND
To AF SG
or
1 k ohm R
<Fig. 1. Jig>
25 V 33MF capascitor to block
DC supply
To CN1
HOT
GND
To AF SG
or
1 k ohm R
<Fig. 1. Jig>
After connection completion, feed an audio frequency signal continuously through both the HOT and
grounding terminals. This permits modulation to be performed.

3
[[Non-modulation]
Disconnect the AF oscillator from the jig, then connect a 1 kΩresistor (the same impedance as that of the
microphone) to both the HOT and grounding terminals.
(2) Connections for RF Measurement
To measure an RF signal, use the coaxial cable attached to the microphone sample submitted. Connect the 3-
pin connector from the coaxial cable to CN9 on the circuit board inside the microphone. (Remove the herical
antenna.) Connect the coaxial cable's BNC end to measuring equipment.
To CN9 To RF Mesuring equipment
<Fig. 2. Coaxial Cable>
(3) Power Supply Connection
The wireless microphone is operated by the battery placed in the battery compartment. To use the external
power supply instead of the battery, connect the battery terminals inside the battery compartment to the
external power supply.
(4) Sensitivity Control
The wireless microphone is designed to permit adjustment of the microphone input sensitivity depending on
the user's speech sound volume. The sensitivity decreases as the control is rotated counterclockwise, and
increases as rotated clockwise. The adjustable sensitivity range is from 115 dB to 130 dB (factory-preset to
115 dB).
(5) Tone Squelch Circuit
To prevent noise of a disturbing radio signal from being provided when the microphone receives the disturbing
signal, the tone signal is superimposed on the audio signal, and the superimposed signals are modulated.
The receiver always checks the tone signal transmitted from the microphone so that the audio output is not
provided from the receiver when it receives an undesired radio signal. The tone signal transmitted from the
microphone is set for 32.768 kHz with deviation of 1.7 kHz.
When the carrier is modulated only by the tone signal, the first side band is the level of 31.7 dB (0.0068%)
below the carrier power, and the second side band 70 dB below the carrier power. This means that the tone
squelch system does not affect the out-of-band power.
(Reference)
FM modulation element of tone signal
Expansion with the Bessel function of instantaneous current i of FM modulated radio wave
i=Io[Jo(mf)sin(Wot)+J1(mf){sin(Wo+Wm)t-sin(Wo-Wm)t}+J2(mf){sin(Wo+Wm)t-sin(Wo-
Wm)t}+J3(mf){sin(Wo+Wm)t-sin(Wo-Wm)t}+.....]
Io: Maximum current value
mf: modulation index
Wo: Angular frequency of carrier wave
Wm: Angular frequency of modulation wave
approxmate formula of Bessel function when mf <<1
Jo(mf)=1 J1(mf)=mf/2 J2(mf)=mf2/8 J3(mf)=mf3/48

4
(6) Assembly/Disassembly of the Microphone
<Disassembly>
1. Holding the upper cover, slide the battery case and push it up as shown in the figure.
2. Remove the battery.
3. Remove two screws using a Phllips screwdriver. (The upper cover can now be removed by hand.)
4. Pull the upper cover to remove it.
5. Remove the switch knob.
6. Remove two Phillips screws to remove the upper circuit board.
7. Remove three Phillips screws to remove the lower circuit board.
<Assembly>
To re-assemble the unit, reverse the procedures above.
Battery Case (5) Take off the switch knob
Battery
MIC BODY
MIC BODY
(6)
(3)
(4)
(7)
Battery Case (5) Take off the switch knob
Battery
MIC BODY
MIC BODY
(6)
(3)
(4)
(7)
Battery Case (5) Take off the switch knob
Battery
MIC BODY
MIC BODY
(6)
(3)
(4)
(7)
Battery Case (5) Take off the switch knob
Battery
MIC BODY
MIC BODY
(6)
(3)
(4)
(7)
Battery Case (5) Take off the switch knob
Battery
MIC BODY
MIC BODY
(6)
(3)
(4)
(7)
Battery Case (5) Take off the switch knob
Battery
MIC BODY
MIC BODY
(6)
(3)
(4)
(7)
Battery Case (5) Take off the switch knob
Battery
MIC BODY
MIC BODY
(6)
(3)
(4)
(7)
Battery Case (5) Take off the switch knob
Battery
MIC BODY
MIC BODY
(6)
(3)
(4)
(7)

5
5. APPEARANCE
Power/Battery lamp
(Orange LED)
Power ON/OFF
switch (push lock)
Audio level control Clip
(Rotates 360.)
Channel select switch
32
23.5
102
142
62
Crip
Plug lock
ø3.5
Power/Battery lamp
(Orange LED)
Power ON/OFF
switch (push lock)
Audio level control Clip
(Rotates 360.)
Channel select switch
32
23.5
102
142
62
Crip
Plug lock
ø3.5
Power/Battery lamp
(Orange LED)
Power ON/OFF
switch (push lock)
Audio level control Clip
(Rotates 360.)
Channel select switch
32
23.5
102
142
62
Crip
Plug lock
ø3.5
Power/Battery lamp
(Orange LED)
Power ON/OFF
switch (push lock)
Audio level control Clip
(Rotates 360.)
Channel select switch
32
23.5
102
142
62
Crip
Plug lock
ø3.5
Power/Battery lamp
(Orange LED)
Power ON/OFF
switch (push lock)
Audio level control Clip
(Rotates 360.)
Channel select switch
32
23.5
102
142
62
Crip
Plug lock
ø3.5
Power/Battery lamp
(Orange LED)
Power ON/OFF
switch (push lock)
Audio level control Clip
(Rotates 360.)
Channel select switch
32
23.5
102
142
62
Crip
Plug lock
ø3.5
Power/Battery lamp
(Orange LED)
Power ON/OFF
switch (push lock)
Audio level control Clip
(Rotates 360.)
Channel select switch
32
23.5
102
142
62
Crip
Plug lock
ø3.5
Power/Battery lamp
(Orange LED)
Power ON/OFF
switch (push lock)
Audio level control Clip
(Rotates 360.)
Channel select switch
32
23.5
102
142
62
Crip
Plug lock
ø3.5
[WM-3310]