Avlex ACT-818 User Manual

ACT-828 Wideband Dual-Channel Digital Receiver

2 CE4 5 4 A

ACT-818 Wideband Single-Channel Digital Receiver

User Guide

MIPRO Electronics Co., Ltd.

Headquarters: 814 Pei-Kang Road, Chiayi, 60096, Taiwan.
Web: www.mipro.com.tw
E-mail: [e-mail]

Design and specifications are subject to change without prior notice

AS121115

! IMPORTANT SAFETY INSTRUCTIONS ! WARNING

1. Read these instructions.

2. Keep these instructions.

3. Heed all warnings.

4. Follow all instructions.

5. Do not use this apparatus near water.

6. Clean only with a dry cloth.

7. Do not block any ventilation openings. Install in accordance with the
manufacturer's instructions.

8. Do not install near any heat sources such as radiators, heat registers,
stoves, or other apparatus (including amplifiers) that produce heat.

9. Do not defeat the safety purpose of the polarised or ground plug: A
polarised plug has two blades with one wider than the other. The wide
blade is provided for your safety. When the provided plug does not fit
into your outlet, consult an electrician for replacement of the obsolete
outlet.

10. Protect the power cord from being walked on or pinched particularly at
plug, convenience receptacles, and the point where they exit from the
apparatus.

11. Only use attachments/accessories specified by the manufacturer.

12. Use only with a cart, stand, tripod, bracket, or table specified
by the manufacturer, or sold with the apparatus. When a cart
is used, use caution when moving the cart/apparatus
combination to avoid injury from tip-over.

13. Unplug this apparatus during lightning storms or when unused for long
periods of time.

14. Refer all servicing to qualified service personnel. Servicing is required
when the apparatus has been damaged in any way, such as power-supply
cord or plug is damaged, liquid has been spilled or objects have fallen
into the apparatus, the apparatus has been exposed to rain or moisture,
does not operate normally, or has been dropped.

15. To reduce the risk of fire or electric shock, do not expose this apparatus
to rain or moisture.

16. Apparatus should not be exposed to dripping or splashing and no objects
filled with liquids, should be placed on the apparatus.

17. Use only with the battery which specified by manufacturer.

18. The power supply cord set is to be the main disconnected device.

1. FOR OUTDOOR USE:
To reduce the risk of fire or electric shock, do not expose this apparatus to
rain or moisture.

2. UNDER WET LOCATION:
Apparatus should not be exposed to dripping or splashing and no objects
filled with liquids, such as vases should be placed on the apparatus.

3. SERVICE INSTRUCTIONS:
CAUTION - These servicing instructions are for use by qualified service
personnel only. To reduce the risk of electric shock, do not perform any
servicing other than that contained in the operating instructions unless you
are qualified to do so.

This symbol indicates that dangerous voltage constituting a risk of electric
shock is present within this unit.

This symbol indicates that there are important operating and maintenance
instructions in the literature accompanying this unit.

IC-ID

This device complies with RSS-310 of Industry Canada. Operation is subject to the
condition that this device does not cause harmful interference.

FCC

THIS DEVICE COMPLIES WITH PART 15 OF THE FCC RULES 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

200 5-08- 13200 5-08- 13

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!

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!

Wideband Digital ReceiversWideband Digital Receivers

Contents

1 Product Overview

3 Key Features

4 Receiver Controls and Indicators - Front Panel

5 Receiver Controls and Indicators - Rear Panel

7 Receiver Installation

9 Rackmount Installation for Receivers

10

11 Receiver VFD Interface

12

22

25 Computer Network Interface Operation

26

Receiver Operating Tips

Function Selection

MIPRO'S Proprietary "ACT" Function and Operation

General Tips for Improving System Performance

Product Overview

MIPRO's industry-leading digital wireless microphone system features compander-free
technology ensures crystal-clear, natural vocal reproduction. The handheld transmitter
microphone is equipped with a premium true condenser microphone capsule and
provides warm and accurate transient detail. Expanded 64MHz bandwidth ensures
optimal flexibility and interference-free, compatible channels can be operated
simultaneously.

27 Troubleshooting

0

1

Wideband Digital ReceiversWideband Digital Receivers

Accessories

The following accessories are included:

Phone Cable x 1

Power Supply ×1
(ACT-818)

Rack-mount kit x 1 set

(ACT-818)

Power Cable x 1Antenna x 2 User Guide x 1

Rack-mount kit x 1 set

(ACT-828)

Key Features

!

ACT-828 is an EIA standard 1U dual channel and ACT-818 is a 1/2U single channel
rack-mountable receiver with metal chassis.

!

Full-color VFD (vacuum fluorescent display) for clear viewing all parameters. All
controls are intuitive and easily accessible, allowing for quick and easy system setup
via a single rotary control.

!

Enhanced RF circuitry improves anti-interference characteristics and system
compatibility.

!

64MHz wide bandwidth allows more interference-free channels can be selected.

!

New digital diversity receiving technology eliminates signal dropouts and enhances
receiving range.

!

Digitally-processed RF circuitry and DigitnamicPlus™ technology eliminates
compander noise assuring the wireless sound quality almost as good as cable
transmission.

!

Second generation DSP technology enhances signal stability and reduces the risk of
signal dropouts during interferences.

!

Improved < 2.7 ms latency. Proprietary Audio A/D Converter provides a true
dynamic range of 115 dBA, T.H.D. < 0.03% at 1 kHz.

!

Without the pre-emphasis and de-emphasis circuit used by analog systems, the
sound quality at high frequency remains clear and detailed.

!

SPDIF Digital Audio Interface facilitates a direct connection to digital mixing consoles
and transmits signal without distortion, therefore S/N ratio will not deteriorate in
long distance transmission.

!

Proprietary 256-bit encryption guarantees secure audio transmission, preventing
unauthorized listening.

!

Built-in 10 SmartEQ™ preset and user-defined microphone capsule equalization for
faithful reproduction to suit artists' preferences.

!

Built-in 10 digital anti-feedback SmartEQ™ minimize howling feedback effectively
without sacrificing sound quality.

!

Ideal audio signal transmissions for studio, stage and music instruments, achieving
“CD quality” performance.

!

Energy-saving design improves power efficiency and decreases temperature rise.

!

Optional MIPRO RCS2.Net software allows real-time network remote-controlling and
monitoring of 64 systems.

2

3

Wideband Digital ReceiversWideband Digital Receivers

Receiver Controls and Indicators

Front Panel

ACT-818

L

CH

ANT

ACT

MHz

WIRELES S RECE IVER

BA

EQ

RF

AF

GRP

BAND

ADD

ACT-818

DIGITAL

11

22 33

ACT-828

L

CH

WIRELES S RECE IVER

BA

ANT

EQ

RF

AF

ACT

MHz

CH 1

GRP

BAND

ACT-828

11

22 33 33

11

Front Antenna A/B Input Connector Access: Allows fitting of an optional FBC-71

ADD

DIGITAL

rear-to-front antenna kit to enable front antenna placement.

22

Power Switch and Indicator: Powers the receiver on or off. When switch is turned
on, the red indicator illuminates and VFD panel will light up.

33

Receiver Display Screen: Color VFD (Vacuum Fluorescent Display).

44

ACT Button & IR Port: Press and release ACT button syncs the transmitter and
receiver frequency automatically.

55

Rotary Knob: Selects and sets the parameters.

PUSH FOR MODE PUSH FOR MODE

SQ

ACT ACT

44 44

55 55

PUSH FOR MODE

SQ

ACT

PARAMETER

44

BAND

ADD

DIGITAL

GRP

CH

WIRELES S RECE IVER

55

L

BA

SQ

ANT

EQ

RF

AF

ACT

MHz

CH 2

PARAMETER

11

Receiver Controls and Indicators

Rear Panel

ACT-818

+8V DC BIAS +8V DC BIAS

LIFT

GND

BALANCED OUT

66

777788

99

SPDIF OUT

LINE

MIC

OUTPUT

1111

1010

1212

ACT-828

ANTENNA B

+8V DC BIAS

LIFT LIFT

GND GND

BALANCED OUT CH2 BALANCED OUT CH1

11

66

66

Rack-Mount Brackets: Fits into a standard 19-inch rack case.

88 88

99 99 1515

Optional MIPRO FBC-71 rear-to-front cables can be installed for front antenna
placement to improve reception quality.

77

Rear Antenna B Input Connector: The B antenna installs directly to this
connector and also provides power to an optional antenna booster (AT-70B) or
active antenna (AT-90W/AT-70W).

88

Lift/GND switch (CH2/CH1).
GND: Pin 1 of XLR connector is grounded;
LIFT: Pin 1 of XLR connector is not grounded. (GND = default value).

99

Balanced Audio Output Socket (CH2/CH1): 3 pin XLR type connector provides
balanced audio output signal same as microphone sensitivity level.

1010

Mic/Line Switch (CH2/CH1): Controls analog balanced output & unbalanced
output level.

MIC level is microphone output level (0dB);
LINE level is auxiliary output.

1111

Unbalanced Audio Output Jack (CH2/CH1): 6.3mm (1/4”) phone-jack type
connector provides unbalanced audio output signal.

1212

Digital Output (CH2/CH1): SPDIF Digital Output

SPDIF OUT CH2 SPDIF OUT CH1

LINE LINE

MIC MIC

OUTPUT CH2 OUTPUT CH1

1111 1111

1010 1010

1212 1212

REMOTE

OUT

This connector can not be connected
to telecommunication networks.

1313

ANTENNA AANTENNA B

DC INPUT

(12~15V)

IN

MADE IN TAIWAN

1515

1414

REMOTE

DC INPUT

ANTENNA A

(12~15V)

+8V DC BIAS

OUT

IN

This connector can not be connected
to telecommunication networks.

1313

1414

AC INPUT: 100~240V

1616

66

MADE IN TAIWAN

66

4

5

Wideband Digital ReceiversWideband Digital Receivers

Function Selection

Rotary Controller: To set parameter values

8 parameters can be selected and programmed. See instructions
below:

SQ

GRP

CH

EQ

ADDANT

L

Parameter Setting Procedures

To Activate Parameters

Press the rotary controller knob  to activate and move the cursor to any of the 8
parameters. Each press moves the cursor to the next parameter. The selected
parameter cursor begins to flash when activated. Rotate the rotary controller whilst
flashing to change a parameter value.

To Change Parameters

Rotate the rotary controller knob clockwise to increase or counterclockwise to decrease
the parameter values.

SQ: Squelch Setting

SQ cursor starts flashing

BA

BAND

ADD

GRP

CH

ANT

ACT

MHz

SQ

EQ

RF

AF

Rotate clockwise to increase the setting by one bar

Rotate counterclockwise to decrease by one bar

Operating Procedure:

1. Press the rotary controller  to activate and move the cursor to the SQ parameter.
When the SQ cursor starts to flash, the squelch level is ready to be set.

2. Rotate the rotary controller clockwise to increase the SQ level; counterclockwise to
decrease the level.

3. Press the rotary controller once to confirm and save the selected SQ level or wait 5
seconds (without touching anything) and the parameter will automatically be saved.

NOTE: The higher the level indicators, the lower the sensitivity - which shortens the

transmission range. The lower the level indicators, the higher the sensitivity
which increases the transmission range. However, when the SQ is set at full
level (5 bars), the "AutoScan" function will be disabled and users can freely
select any group or channel manually.

8

To Save Changed Parameters Manually

The parameter changes will be saved manually if the rotary controller is pressed after
adjusting. The cursor stops flashing after the rotary controller is pressed to confirm the
change.

To Save Changed Parameters Automatically

The parameter changes will be saved automatically if the rotary controller is not
pressed for approximately 5 seconds. The cursor also stops flashing after 5 seconds.

12

13

Wideband Digital ReceiversWideband Digital Receivers

GRP: Group Setting

Refer to the supplied channel plan for your band to select a specific frequency.

GRP cursor starts flashing

BA

BAND

ADD

GRP

CH

ANT

ACT

MHz

SQ

EQ

RF

AF

Turn clockwise to increase by one group

Turn counterclockwise to decrease by one group

Operating Procedure:

1. Press the rotary controller  to activate and move the cursor to the GRP
parameter. When the GRP cursor starts to flash, the Group is ready to be set.

2. Rotate the rotary controller clockwise to increase the Group number;
counterclockwise to decrease the Group number.

3. Press the rotary controller once to confirm and save the selected Group number (or
wait for autosave).

8

CH: Channel Setting

CH cursor starts flashing

BA

BAND

ADD

GRP

CH

ANT

ACT

MHz

SQ

EQ

RF

AF

Rotate the controller to AutoScan for an open,
interference-free preset channel

Operating Procedure:

1. Press the rotary controller  to activate and move the cursor to the CH parameter.
When the CH cursor starts to flash, the Channel is ready to be set.

2. Rotate the rotary controller clockwise to increase the Channel number;
counterclockwise to decrease the Channel number.

3. Press the rotary controller once to confirm and save the selected Channel number
(or wait for autosave).

NOTE: When the SQ is set at full level (showing 5 bars), the "AutoScan" function

will be disabled and the user may freely select any preset group or channel
manually.

5

14

15

Wideband Digital ReceiversWideband Digital Receivers

ANT: Antenna A/B Setting

Used for setup only.

ANT cursor starts flashing

BA

BAND

ADD

GRP

CH

ANT

ACT

MHz

SQ

EQ

RF

AF

Operating Procedure:

Antenna “Auto” Setting

This is used primarily to test each remote antenna position for signal strength when
setting the system up in a venue. The Antenna selection is factory set by default to the
“Auto” setting. MIPRO recommends that the antenna is always left set to “Auto” in
normal use.

1. Press the rotary controller  to activate and move the cursor to the ANT parameter.
When the outer ANT cursor starts to flash, the antenna indicator is ready to be set.

2. Press and hold the rotary controller for 3 seconds until the inner ANT cursor starts
to blink.

3. Rotate the rotary controller to the “Auto” position.

4. Press the rotary controller once to confirm and save the selected antenna position
(or wait for auto save)

Antenna “A” or “B” Setting:

Important: Antenna A or B setting is only to be used for testing received signal

strength during the sound check. Repeated signal dropouts may occur if the receiver is
set to just “A” or “B” only. Thus, this setting is not recommended for performance. Once
antenna testing is complete, change back to “Auto” and store the setting.

1. Press the rotary controller  to activate and move the cursor to ANT parameter.
When the outer ANT cursor starts to flash, the Antenna is ready to be set.

2. Press and hold the rotary controller for 3 seconds until the inner ANT cursor starts
to blink.

3. Rotate the rotary controller to either antenna “A” or “B”.

4. Press and release the rotary controller to set the selected antenna position.

Auto

ANT

Antenna A

ANT ANT

Antenna B

5

16

EQ: Capsule Equaliser Setting

The EQ parameter is used to select from a range of simulated microphone capsule EQ's.
The default setting for the factory fitted MIPRO capsule is “00”

EQ cursor starts flashing

BA

BAND

ADD

GRP

CH

ANT

ACT

MHz

SQ

EQ

RF

AF

Turn clockwise to increase by one number

Turn counterclockwise to decrease by one number

BA

BAND

ADD

GRP

CH

ANT

ACT

MHz

SQ

EQ

RF

AF

“F” denotes anti-feedback feature is activated

“0” denotes anti-feedback feature is not activated

Operating Procedure:

1. Press the rotary controller  to activate and move the cursor to the EQ parameter.

When the EQ cursor starts to flash, the Equalizer is ready to be set.

2. Rotate the rotary controller clockwise to increase the Equalizer number;
counterclockwise to decrease the Equalizer number.

3. The first digit in EQ parameter will be either F or 0. F denotes anti-feedback is
activated and 0 denotes anti-feedback is not activated.

4. The second digit in EQ parameter denotes the selected Equalizer number. A total of
10 EQ numbers are available starting with 0 and ends with 9. Numbers 0 ~ 8 are

preset EQs and number 9 is user-defined. 0 is the default EQ number.

NOTE: There are 9 preset and 1 user-defined built-in equalisers (00-09). EQ “00” is

17

the default EQ for the factory fitted MIPRO handheld microphone capsule.
EQ's “01-08” are eight other simulated microphone capsule presets. EQ “09”
is user-defined and can be programmed by the user. However, the receiver
needs to be set up and interfaced with a PC and MIPRO software before this
can be achieved.

5

5

Wideband Digital ReceiversWideband Digital Receivers

ADD: Address Setting for PC Remote Control

For normal “stand-alone” use, this parameter does not need to be set. However when
multiple receivers are to be used and controlled remotely using the MIPRO optional
control software each receiver must be given a unique address. Always ensure that you
set this address before adding the receiver to the remote control network.

ADD cursor starts flashing

BA

BAND

ADD

GRP

CH

ANT

ACT

MHz

SQ

EQ

RF

AF

Rotate clockwise to increase by one number (01-64)

Rotate counterclockwise to decrease by one number (64-01)

Operating Procedure:

1. Press the rotary controller  to activate and move the cursor to the ADD
parameter. When the ADD cursor starts to flash, the Address is ready to be set.

2. Rotate the rotary controller clockwise to increase the Address number;
counterclockwise to decrease the Address number.

3. Press the rotary controller once to confirm and save the selected Address number.

NOTE: This receiver is equipped with an ACT-BUS interface. It allows users to use

the MIPRO-DV (interface converter) and software (sold separately with
MIPRO-DV) for remote PC monitoring. It can monitor up to a maximum of
64 channels at the same time. The receiver module address can be set
from 1 to 64. In order to monitor the system remotely, each channel must
have its own address for individual identification. If two or more channels
have been assigned the same address, it will cause confusion in the
monitoring system. If the system is not under PC monitoring/control,
identical addresses will not affect the receivers' operation.

8

Encryption ( ): to Add or Remove Encryption

Encryption icon starts flashing

BA

GRP

BAND

ADD

indicates receiver is encrypted

" “
" "

indicates receiver is not encrypted

CH

ANT

ACT

MHz

SQ

EQ

RF

AF

Press & hold to encrypt or decrypt

Encryption Instructions:

1. Press the rotary controller  to activate and move the cursor to the icon. When
the icon starts to flash and the word “NO” appears, the encryption function is
ready to be set.

2. Press and hold the rotary controller for approximately 3 seconds until the word
changes from “NO” to “YES”.

3. Press rotary controller once to confirm and save the selected “YES” for encryption.
The transmitter now needs to be synced to the receiver using the ACT function to
apply the encryption.

NOTE:

! Encryption is factory set by default to “NO” in the receiver (encryption OFF).

! The transmitter can only display encryption status and cannot activate/de-

activate encryption.

! The 128-bit encryption key is randomly generated; hence, a new, secure,

encryption key is also downloaded to a transmitter each time an ACT function is
synced successfully.

! This means the last encrypted transmitter will work only with the encrypting

receiver. It also means that previously encrypted transmitters will not work with
the encrypting receiver even though they are on the same frequency as there
will be no audio output. This method also ensures that another similar receiver
cannot listen in to the encrypted transmitter.

5

18

19

Wideband Digital ReceiversWideband Digital Receivers

Decryption Instructions:

1. Press the rotary controller  to activate and move the cursor to the icon. When
the icon starts to flash and the word “YES” appears, the Encryption function is
ready to be set.

2. Press and hold the rotary controller for approximately 3 seconds until the word
changes from “YES” to “NO”.

3. Press the rotary controller once to confirm and save the selected “NO” to turn off
the Encryption. Transmitter now needs to be re-synced using ACT to turn transmitter
encryption OFF.

Encryption Setup Flow Chart

Hold  for
2~3 Seconds

BAND

ADD

Encryption

No→YES

Encryption

YES→No

Aim TX to

ACT Button

Aim TX to

ACT Button

Press ACT

Button

Press ACT

Button

(Encrypted) (Not Encrypted)

BA

GRP

CH

ANT

RF

ACT

MHz

SQ

EQ

AF

BAND

ADD

GRP

TX

ENCRYP→No

TX

ENCRYP→Yes

CH

ANT

ACT

MHz

RF

BA

EQ

AF

Encrypted

Not Encrypted

SQ

Parameter Lock ( ): to Lock and Unlock Receiver Parameters

BAND

ADD

Indicates the receiver is ready to be locked " "

L

Icon starts flashing

L

L

GRP

CH

ANT

ACT

MHz

BA

SQ

EQ

RF

AF

5

Rotate for “ON” or “OFF”

" " Indicates the receiver is not locked

To Lock Receiver:

1. Press the rotary controller  to activate and move the cursor to the icon. When

L

the icon starts to flash, the Lock function is ready to be set.

2. Rotate the rotary controller clockwise or counterclockwise to the “ON” position.

3. Press the rotary controller once to confirm and save the selected “ON” to lock all
parameters.

NOTE: When locked, the receiver parameters can no longer be changed (except this

one!). However, you can still navigate to view existing settings and
parameters.

L

20

To Unlock Receiver:

1. Press the rotary controller  to activate and move the cursor to the icon. When
the icon starts to flash, the Lock function is ready to be set.

L

2. Rotate the rotary controller clockwise or counterclockwise to the “OFF” position.

3. Press the rotary controller once to confirm and save the selected “OFF” to unlock all
parameters. Changes can now be made normally.

( : icon illuminated: Parameters locked)

L

BAND

ADD

GRP

L

CH

ANT

ACT

MHz

BA

SQ

EQ

RF

AF

(no : icon: Receiver not locked)

L

GRP

BAND

ADD

CH

21

MHz

L

BA

ANT

ACT

SQ

EQ

RF

AF

Wideband Digital ReceiversWideband Digital Receivers

MIPRO'S Proprietary "ACT" Function and Operation

What is ACT?

“ACT” stands for “Automatic Channel Targeting”. MIPRO developed and patented this
innovative InfraRed (IR) technology in 2001. MIPRO was the first manufacturer in the
industry to automatically synchronise the frequency selected on the receiver to any ACT
handheld or bodypack transmitter in the same frequency band.

ACT Benefits

!

No manual frequency adjusting needed, unlike traditional transmitters.

!

Simple, fast and precise frequency setup without mechanical errors.

!

Once the frequency has been set, the data is written to memory in the transmitter.

This ensures that the transmitter frequency now stays with that transmitter. That is,

of course, until a change is required. By performing the “ACT” function again, the

frequency can be re-programmed to another Group/Channel as necessary.

ACT Set-Up

!

Ensure a receiver channel is set up, the transmitter battery is charged, and the

transmitter is powered ON.

!

Press and release the ACT button on the receiver to activate the ACT sync function.

Once activated, the words “ACT” and “Sync” will illuminate.

!

Move the ACT handheld or bodypack transmitter IR window to within 30cm (12”) of

the IR port on the receiver. The IR port on the receiver is located behind the “ACT”

button itself and is indicated by a round, dark red dot. The frequency will sync

automatically.

!

When the frequencies have successfully synchronised between the receiver and

transmitter the illuminated “ACT” and “Sync” will disappear. The RF meter will now

illuminate and show full RF strength.

L

GRP

CH

BAND

ANT

ADD

ACT-828

MHz

DIGITAL

WIRELESS RECE IVER

Once ACT button is pressed, it
automatically syncs the selected
receiver frequency to any MIPRO
ACT handheld or bodypack
transmitter in the same frequency
band quickly and precisely.

PUSH FOR MODE PUSH FOR MODE

BA

SQ

EQ

RF

AF

ACT

ACT ACT

CH 1

< 3

L

BA

SQ

GRP

CH

BAND

ANT

ADD

EQ

RF

AF

ACT

MHz

DIGITAL

WIRELESS RECE IVER

0

c

m

(12 n

PARAMETER

CH 2

i

.)

or

22

Setting ACT Transmitter Frequency

Press ACT button

BA

GRP

BAND

ADD

CH

ANT

ACT

MHz

Indicates the frequencies did not sync successfully. Ensure the IR windows in both the
receiver and transmitter are lined up and can “see” each other, then press the ACT
button again.

To Activate:

Press the “ACT” button once to activate the ACT sync function. Once activated, the
words “ACT” and “Sync” on the receiver will illuminate. Flashing will stop when the IR
signal is received by the handheld or bodypack transmitter or no IR signal is received
within 10 seconds.

To Cancel:

!

When the words “ACT” and “Sync” on the receiver illuminate, press the ACT button
again.

!

When the words “ACT” and “Sync” on the receiver illuminate, do not press any
button. ACT function will stop and cancel automatically after about 10 seconds.

Instructions:

1. Ensure a receiver channel is set up (Group / Channel), the transmitter battery is
charged and the transmitter is powered ON.

2. Press the ACT button on the receiver to activate the ACT function. Once activated,
the words ACT and Sync will illuminate.

3. Bring the ACT handheld or bodypack transmitter within 30cm (12”) of the IR port on
the receiver (check your transmitter documentation to find out where the IR port is
located on the transmitter). The receiver IR port is located behind the “ACT” button
and indicated by a round dark red dot.
The transmitter/receiver frequency will sync automatically.

4. When the frequencies are successfully synchronised the words ACT and Sync will
disappear and the RF meter will immediately indicate full RF signal received.

NOTE: If encryption is turned on, the ACT function will also send a new encryption key
to the transmitter and lock it. To unlock the transmitter it is necessary to re-sync the
transmitter again using ACT with the receiver in “Encryption OFF” mode.

23

SQ

EQ

RF

AF

ACT indicator illuminates

Wideband Digital ReceiversWideband Digital Receivers

BA: Transmitter Battery Meter (receiver display)

BA

BA BA BA BA BA

100 % 90% 80% 40% 10% 0%

The battery meter illuminates when the transmitter is powered ON. The LCD battery
meter gives a percentage (%) indication of remaining battery life, as shown above.
Recharge the transmitter battery (or replace with a charged battery pack) immediately
when battery indicators fall to 10% (1 bar showing as indicated above).

Computer Network Interface Operation

1. MIPRO ACT receivers are fitted with an ACT-BUS interface to enable remote control
and monitoring via a PC-based control system. To enable this to communicate, an
optional MIPRO interface adapter and software package is required.

2. Wiring Instructions

! Network interfacing of the ACT-818/ACT-828 receivers is achieved via the REMOTE

IN of the Network Interface Connector . This enables the receiver(s) to be linked
to a computer using a MIPRO-DVJ (Serial) or MIPRO-DVU (USB) interface
connector. Using the RS-232 or USB connector, you can link to a computer through
the RS-232 COM port or USB port. (See diagram below)

Connect to keyboard jack on PC Connect to RS-232 jack on PC

PC

MIPRO DVJ

AC INPUT: 100~240V

MADE IN TAIWAN

AC INPUT: 100~240V

MADE IN TAIWAN

RX1

RX2

Connector of keyboard
should plug in here

Connect to USB
jack on PC

ANTENNA B

+8V DC BIAS

LIFT LIFT

LINE LINE

MIC MIC

GND GND

BALANCED OUT CH1 BALANCED OUT CH2

OUTPUT CH1 OUTPUT CH2

ANTENNA B

+8V DC BIAS

LIFT LIFT

LINE LINE

MIC MIC

GND GND

BALANCED OUT CH1 BALANCED OUT CH2

OUTPUT CH1 OUTPUT CH2

MI PRO D VU

SPDIF OUT CH1 SPDIF OUT CH2

SPDIF OUT CH1 SPDIF OUT CH2

REMOTE

OUT

This connector can not be connected
to telecommunication networks.

REMOTE

OUT

This connector can not be connected
to telecommunication networks.

OR

DC INPUT

ANTENNA A

(12~15V)

+8V DC BIAS

IN

DC INPUT

ANTENNA A

(12~15V)

+8V DC BIAS

IN

24

RX3

ANTENNA B

+8V DC BIAS

LIFT LIFT

LINE LINE

MIC MIC

GND GND

BALANCED OUT CH1 BALANCED OUT CH2

SPDIF OUT CH1 SPDIF OUT CH2

OUTPUT CH1 OUTPUT CH2

REMOTE

OUT

This connector can not be connected
to telecommunication networks.

DC INPUT

ANTENNA A

(12~15V)

+8V DC BIAS

IN

AC INPUT: 100~240V

MADE IN TAIWAN

! Plug one side of the supplied telephone-type cable (RJ-11 connectors) to the

REMOTE OUT socket of the on the rear of the receiver and the other end of the
cable to the REMOTE IN socket on the rear of the second receiver. Repeat this
connection for each receiver in the system as per the illustration above. Finally,
connect the REMOTE IN socket on the rear of the first receiver to the MIPRO-DVU
or MIPRO-DVJ.

! The system can link, monitor and control up to 64 receiver channels

simultaneously.

! The connection cable to the computer can be up to 300 metres (330 yards) in

length. However, signal stability and data transmission speed decreases as cable
distance gets longer. RF it is recommended not to exceed 100m (110 yards) to
maintain the highest data quality as well as a high transmission speed.

25

Wideband Digital ReceiversWideband Digital Receivers

General Tips for Improving System Performance

!

Since the installation of the antenna influences the operating efficiency of the
receiver, the most important rule is to minimise the distance as much as possible
between the receiving antenna and the microphone for the best reception and
performance.

!

Use MIPRO supplied antennas to ensure proper receiver sensitivity.

!

A built-in worldwide approved switching power supply assures stable performance in
the range of 100-240V AC mains power input.

!

The antenna socket provides an 8V DC biased output. RF, shorting the antenna
socket should be avoided. Temporary shorts on the antenna socket will not affect
system performance (provided the short is removed), however, a continuous short
on the socket may cause permanent system damage.

!

If extended reception distance is required, installing a MIPRO wideband active
directional antenna kit (AT-90W) will increase antenna performance and thus achieve
better range.

!

Proper antenna distribution is vital to achieving ideal performance from multiple
wireless systems operating in the same environment. To greatly reduce antenna
clutter in multi-system installations, a MIPRO AD-707a UHF wideband antenna
divider system is recommended. Each AD-707a supports up to four UHF diversity
receivers to operate from a single pair of antennas. When combined with an AT-70A
omni-directional extension antenna and an AT-70B antenna booster or an AT-90W
wideband active directional antenna, the AD-707a antenna divider provides optimal
signal reception with minimal dropouts or interference. Note that the AD-707a
antenna divider must match the same band designation (7A,7B,8A,8B etc.) as the
receiver to ensure proper operation.

!

MIPRO's factory preset “interference-free” channels within the same channel group
are recommended to ensure optimum performance from multiple wireless systems
installed in the same venue. Use of preset “interference-free” channels from
different channel groups may cause interference due to intermodulation issues, and
is therefore not recommended.

Troubleshooting

Symptom

No Sound

Signal Drop-outs

Limited Range

No RF Signal

Solutions

! Power-on receiver & transmitter.

! Receiver is plugged into a power outlet and cable connected

! Fresh batteries in transmitter and inserted with correct

! Match receiver & transmitter frequency.

! Close proximity between the transmitter and receiver antenna.

! Line-of-sight path between the transmitter and receiver

! Reposition the receiver and/or receiver antennas.

! Receiver antennas are connected.

! Elevate receiver antennas as high as possible.

! Keep hands off of the transmitter antenna.

! Close proximity between the transmitter and receiver antenna.

! Adjust antenna orientation.

! Reposition the receiver and/or receiver antennas.

! Receiver antennas are connected.

! Undamaged antennas.

! Fresh batteries in transmitter.

! Adjust for proper squelch level setting.

! Match receiver & transmitter frequency.

! Adjust for proper squelch level setting.

to mixer/amplifier.

polarity.

antenna.

26

Distortion

27

! Reduce transmitter gain, if set too high.

! Recommendation: set to 0dB (Mic Level).

! Reduce receiver output setting.

! Proper setting on mixer input gain or integrated amplifier mic

level control.

! Fresh batteries in transmitter.

Troubleshooting

Wideband Digital ReceiversWideband Digital Receivers

Symptom

RF Interference

Feedback

Solutions

! Press AutoScan button to locate a clear, interference-free

channel.

! Use preset compatible channels in the same group when

operating multiple systems.

! Place receivers away or remove the sources of RF interference

like solid metal objects, electronic equipment & digital devices,
dimmers, effect equipment, motors.

! Avoid operating a frequency on a local TV channel.

! A higher squelch setting improves protection against

interference. (however, resulting in limited range)

! Turn off one transmitter, if both transmitters are operating on

the same frequency.

! Fresh batteries in transmitter.

! Turn down the sound system volume.

! Move microphone closer to the performer's mouth.

! Reduce transmitter gain if set too high.

! Position microphone further away from the speakers. Do not

point towards speakers.

! Use right type of microphone for the specific applications.

Uni/Omni, Supercardioid / Cardioid.

! Power off all unused microphones.

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