ACT-7H
Handheld Transmitter
User Guide
MIPRO Electronics Co., Ltd.
Headquarters: 814 Pei-Kang Road, Chiayi, 60096, Taiwan.
Web:
www.mipro.com.tw
E-mail: mipro@mipro.com.tw
2 CE3 7 4 B
AS110215
Design and specifications are subject to change without prior notice
Handheld Transmitter
Handheld Transmitter
KEY FEATURES:
PART NAMES AND FUNCTIONS
 Rugged magnesium alloy construction.
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 Patented rear housing design protects accidental
power on/off and built-in antenna from breakage.
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GROUP CHANNEL BAT
 Bright LCD display shows group, channel, battery
status and error code.
 Ten different rear caps to visually identify a
particular microphone channel on stage.
 World's first ACT function uploads the selected
receiver frequency into the transmitter
automatically and rapidly.
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 Interchangeable condenser or dynamic
microphone capsule. Upper grille allows quick
removal for cleaning and replacement.
 Hyper-cardioiod directional condenser capsule
exhibits high fidelity, dynamic range, fast
transient responses, low feedback characteristics.
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(Figure 1)
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Top Grille: Protects detachable microphone
capsule module and internal foam prevents
breathing, wind and POP noises.
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Upper Housing: Houses transmitter PCB and
battery compartment.
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LCD Screen: Displays group, channel, battery
status and error code.
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Lower Housing: Protects battery compartment
and holds batteries.
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Power On-off Switch: Slide the power switch
to the “ON” position for use or to the “OFF”
position when not in use.
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Color Coded Protection Cap: Protects against
accidental power on/off. Available in different
colors for channel differentiation.
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ACT Infrared (IR) Port: Receives signals from
receiver to synchronize frequencies.
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Battery Compartment: Accommodates two 1.5
Volt (AA) batteries.
 High SPL inputs avoid distortion.
 High efficiency circuitry and sophisticated PCB
design with extended battery hours.
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Handheld Transmitter
Handheld Transmitter
BATTERY INSTALLATION
PROPRIETARY DESIGN TO AVOID ACCIDENTAL
POWER ON/OFF
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The protective handheld cap prevents accidental
power on/off and protects internal components.
REMOVE HANDHELD TRANSMITTER CAP:
(Figure 2)
1. Unscrew lower housing
direction.
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in counter-clockwise
2. Insert two 1.5 Volt (AA) batteries into the battery
compartment according to the correct polarity as
shown in Figure 2. When batteries are installed
correctly, the battery meter in the LCD screen will
show the current battery strength.
NOTE:
When microphone is not in use make sure the
microphone is switched off. If the microphone will
not be used for some time, please remove the
batteries from the battery compartment to avoid
battery leakage which could result in damage to
the microphone. If rechargeable batteries are
used, remove and recharge when necessary.
Always change both batteries at the same time.
Power OFF Transmitter.
Unscrew Lower Housing.
Pull out the cap.
INSTALL HANDHELD TRANSMITTER CAP
(Covers On/Off Switch):
Power ON Transmitter.
Unscrew Lower Housing.
Pull out, reverse and
push in cap.
Fasten lower housing back in place
Caution: We recommended the cap is fitted during
operation.
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Handheld Transmitter
Handheld Transmitter
BATTERY STATUS
LCD SCREEN
GROUP CHANNEL BAT
ERR
!
ERR Message: When “ERR” appears in the display
it indicates that an operational error has occurred.
Please refer to the following codes to diagnose
which error you are experiencing.
ERR no01
EEPROM is not being programmed or internal
data error.
ERR no02
For testing only.
ERR no03
The frequency you want to program is above
the switching bandwidth of the transmitter.
Use a receiver with an appropriate frequency
group. (At this time the microphone is still
operating and the frequency remains
unchanged. To clear the displayed "ERR"
message, switch the handheld transmitter off
and on again.)
ERR no04
The frequency you want to program is below
the switching bandwidth of the transmitter.
Use a receiver with an appropriate frequency
group. (At this time the microphone is still
operating and the frequency remains
unchanged. To clear the displayed “ERR”
message, switch the handheld transmitter off
and on again.)
!
“Group” & “Channel” : When both the group
and channel numbers are displayed, it means that
you are using the pre-programmed frequency of
the receiver.
!
“Channel” Only: If “Channel” only is displayed, it
means that you are using a frequency which is not
pre-programmed.
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100%
80%
40%
10%
0%
Indicates the power remaining in the transmitter
battery. When the battery has less than 10% power
remaining it must be replaced or recharged. If an
under voltage condition continues, the LCD will show
“Poff” and the system will shut down to prevent
being overly discharged.
“Poff” - Power Off :
When the power switch is turned off, the LCD will
show “Poff” (for Power Off) first and then the system
will shut down and no further messages will be
displayed.
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Handheld Transmitter
Handheld Transmitter
CAUTIONS
!
!
!
& IC - ID
The ACT-7H has an integrated antenna at the end of the rear
housing (covered by the color protective cap). Performer
should avoid holding the microphone over or near the antenna
section as this will deteriorate transmission efficiency. Severe
deterioration if performer directly covers up the antenna
section with both hands.
Many performers tend to hold the microphone by the top grille.
Unfortunately, this position seriously degrades both the sound
quality and directionality of a microphone. Even the most
expensive microphones will have its original sound quality
compromised by this method. Grabbing a microphone by the
grille will isolate the capsule's acoustic resonance circuit and or
change the capsule resonator's frequency. This results in an
inferior performance in both frequency response and the
separation of directionality. In addition, a palm's soundfocusing effect will tend to strengthen resonances in certain
frequencies and can cause unwanted echo.
A proper technique is required for using directional
microphones because the distance between the microphone
and your mouth has a significant impact on sensitivity and
performance. There is an inverse relationship between
microphone sensitivity and the distance from the mouth to the
microphone. Consequently, performers with a ''weaker'' sound
level cannot expect to hold the microphone too far away from
their mouth and compensate by turning up the amplifier
volume to increase the sound level as this can easily cause
echo or feedback. In contrast, performers with a ''louder''
sound level should not hold the microphone too close as this
can easily result in distortion by causing the amplifier system
to be overloaded.
!
Furthermore, a large-diaphragm directional microphone has a
very distinct proximity effect. When the microphone is close to
the mouth, the bass response is strengthened as the distance
gets closer. Therefore, if a performer's sound is insufficient in
bass, they can hold the microphone closer and use the
proximity effect to help compensate for the lower bass level.
Conversely, if a performer's voice is too heavy in the bass
register, increasing the distance between the microphone and
their mouth will decrease the proximity effect and reduce the
bass response, thus making their voice become clearer and
brighter.
!
It is recommended to keep the grille and sponge windscreen
clean to avoid any substance blocking the proximity effect of
the microphone.
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THIS DEVICE COMPLIES WITH PART 74 OF THE FCC RULES AND
RSS-123 ISSUE1 OF CANADA. OPERATION IS SUBJECT TO THE
FOLLOWING TWO CONDITIONS:
(1) This device may not cause interference.
(2) This device must accept any interference, including interference
that may cause undesired operation of the device. This equipment
complies with FCC RF radiation exposure limits set forth for an
uncontrolled environment.
Disposal
Dispose of any unusable devices or batteries
responsibly and in accordance with any applicable
regulations.
Disposing of used batteries with domestic waste is to
be avoided!
2005-08-13
Batteries / NiCad cells often contain heavy metals such
as cadmium(Cd), mercury(Hg) and lead(Pb) that
makes them unsuitable for disposal with domestic
waste. You may return spent batteries/accumulators
free of charge to recycling centres or anywhere else
batteries/accumulators are sold.
By doing so, you contribute to the conservation of our
environment!
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