Sennheiser Electronic AC3 User Manual

AC 3_XXXXX__0109_Sp8.book Seite 1 Dienstag, 17. Februar 2009 1:59 13

Active Antenna Combiner

AC 3

Bedienungsanleitung Instruction manual

Notice d’emploi

Manual de instrucciones

инструкция по эксплуатации

|
|

Istruzioni per l’uso

|

Manual de instruções

本使用说明书

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AC 3_XXXXX__0109_Sp8.book Seite 2 Dienstag, 17. Februar 2009 1:59 13

AC 3_XXXXX__0109_Sp8.book Seite 1 Dienstag, 17. Februar 2009 1:59 13

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hank

AC 3_XXXXX__0109_Sp8.book Seite 1 Dienstag, 17. Februar 2009 1:59 13

Contents

Important safety instructions ........................................................ 2

The AC 3 active transmitter combiner ......................................... 4

Delivery includes ............................................................................... 4

Operating controls ............................................................................ 5

Block diagram .................................................................................... 6

Putting the AC 3 into operation .................................................... 7

Preparing the AC 3 for use ............................................................ 7

Using the AC 3 ................................................................................. 12

Cleaning the AC 3 ........................................................................... 13

If a problem occurs ... ..................................................................... 14

Accessories ...................................................................................... 15

Specifications .................................................................................. 16

Manufacturer Declarations ........................................................... 17

Contents

you for choosing Sennheiser!

T

We have designed this product to give you reliable operation
over many years. Over 60 years of accumulated expertise in the
design and manufacture of high-quality electro-acoustic equip­ment have made Sennheiser a world-leading company in this
field.

Please take a few moments to read these instructions carefully,
as we want you to enjoy your new Sennheiser products quickly
and to the fullest

1

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Important safety instructions

Important safety instructions

• Read this instruction manual.

• Keep this instruction manual. Always include this instruction
manual when passing the device on to third parties.

• Heed all warnings and follow all instructions in this instruc­tion manual.

• Clean only with a slightly damp cloth.

• Refer all servicing to qualified service personnel.
Servicing is required if the device has been damaged in any
way, liquid has been spilled, objects have fallen inside, the
device has been exposed to rain or moisture, does not operate
properly or has been dropped.

• WARNING: To reduce the risk of fire or electric shock, do not
use t he dev ice ne ar wat er and do not ex pose it t o rain or moi s­ture. Do not place objects filled with liquids, such as vases or
coffee cups, on the device.

• Only use the NT 3-1 table top power supply (see “Accesso­ries” on page 15).

• Do not block any ventilation openings. Install the device in
accordance with the instructions given in this manual.

• Do not install the device near any heat sources.

• Only use attachments/accessories specified by Sennheiser.

Replacement parts

When replacement parts are required, be sure the service tech­nician uses replacement parts specified by Sennheiser or those
having the same characteristics as the original part. Unauthor­ized substitutions may result in fire, electric shock, or other
hazards.

Safety check

Upon completion of any service or repairs to this device, ask the
service technician to perform safety checks to determine that
the device is in a safe operating condition.

2

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Intended use of the device

Intended use of the AC 3 includes:

• having read and understood this instruction manual espe-

cially the chapter “Important safety instructions” on page 2,

• using the device within the operating conditions and limita-

tions described in this instruction manual.

“Improper use” means using the AC 3 other than as described
in this instruction manual, or under operating conditions which
differ from those described herein.

Important safety instructions

3

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The AC 3 active transmitter combiner

The AC 3 active transmitter
combiner

With the AC 3 4-to-1 active transmitter combiner, the signals of
up to four SR300IEMG3 type transmitters can be combined
onto a single antenna.

The integral active RF amplifiers ensure that the input signals
are combined onto the common antenna output with no distri­bution attenuation.

The AC 3 incorporates DC distribution to enable simultaneous
powering of up to four transmitters via its BNC sockets. A single
NT 3-1 table top power supply (see “Accessories” on page 15)
is required to power the AC 3 and the connected transmitters.

Using the GA 3 rack adapter (see “Accessories” on page 15),
one AC 3 and one stationary SR 300 IEM G3 type transmitter
can be mounted into a 19” rack.

Alternatively, you can stack the AC 3. For stacking the AC 3,
mount the optional stacking elements (see “Accessories” on
page 15).

The AC 3 is suitable for the following areas of application:

• Multi-channel monitoring systems for stage use

• Multi-channel systems suitable for any application where
talk-back signals are to be transmitted (e.g. studio)

Delivery includes

1 AC 3 active transmitter combiner

1 set of device feet

4BNC cables

1 instruction manual

You additionally require the NT 3-1 table top power supply with
a suitable mains connector (see “Accessories” on page 15).

4

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Operating controls

Operating controls

쐃

쐇

쐂쐊쐆

12V/350mA

DC
1
2
3

4

USE NT 3-1 ONLY

13,8V/3,5A

DC IN

쐋

쐏쐄

ANTENNA COMBINER AC 3

RF OUT

ANT

RF IN 1 RF IN 2 RF IN 3 RF IN 4

DC OUT

쐃 STANDBY button
쐇 Operation indicator
쐋 4 status LEDs

– light up if the supply voltage for the transmitter is avail-

able at the BNC sockets RF IN 1 to RF IN 4

– go off if the BNC sockets RF IN 1 to RF IN 4 are short-

circuited or if transmitters are connected that are not of
the ew G3 series (e.g. transmitters of the ew G2 series)

쐏 Cable grip for cable of table top power supply
쐄 DC IN socket

for connection of NT 3-1 table top power supply

쐂 4 BNC sockets RF IN 1 to RF IN 4

RF inputs for connection of the transmitters
Each of these RF inputs can power one transmitter.

쐆 Air vents
쐊 BNC socket RF OUT

for connecting the transmitting antenna

5

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Block diagram

Block diagram

The below block diagram shows the connections for a 4-channel
system with a single antenna.

STANDBY

NT 3-1

AC

DC

ANT

RF Output

AC 3

DC feed

RF Inputs

DC

SR 300

SR 300

SR 300

SR 300

6

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Putting the AC 3 into operation

Preparing the AC 3 for use

Setting up the AC 3 on a flat surface

왘 Place the AC 3 on a flat, horizontal surface.

Putting the AC 3 into operation

Fastening the

stacking elements

The stacking elements (see “Accessories” on page 15)
are designed to help protect the operating elements
from damage or deformation, e.g. if the AC3 is
dropped.

왘 Fasten the stacking elements even if you do not

want to stack your AC 3.

왘 Do not fasten the stacking elements when mounting

the AC 3 into a 19” rack (see page 9).

To fasten the stacking elements 쐎:

쐎

왘 Unscrew and remove the two recessed head screws (M4x8)

on each side of the AC 3.

왘 Secure the stacking elements 쐎 to the sides of the AC 3

using the previously removed recessed head screws (see
diagram).

7

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Putting the AC 3 into operation

Stacking

several devices

CAUTION! Danger of injury due to toppling stacks!

You can stack several AC 3 and the connected transmitters on
top of each other.

.

High stacks can easily topple over.

왘 Place the stack on an absolutely flat surface.
왘 Secure the stack against toppling over.

왘 Stack the devices so that the recesses of the stacking

elements completely engage with each other.

Fitting the

device feet

If you want to stack the AC 3, only fit the device feet to
the base of the lowermost device.

Do not fit the device feet when mounting the AC 3 into
a 19” rack.

The device feet are fitted to the base of the AC 3 (see diagram).

왘 Clean the base of the AC 3 where you want to fix the device

feet.

왘 Fix the device feet to the base of the AC 3 by peeling off the

backing paper and fitting them as shown on the left.

왘 Place the AC 3 on a flat, horizontal surface.

Please note that the device feet can leave stains on deli­cate surfaces!

8

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Mounting the AC 3 into a 19” rack

CAUTION! Risks when rack mounting the device!

When installing the device in a closed or multi-rack assembly,
please consider that, during operation, the ambient tempera­ture, the mechanical loading and the electrical potentials will be
different from those of devices which are not mounted into a
rack.

왘 The ambient temperature within the rack must not exceed

the temperature limit specified in the specifications.

왘 Ensure sufficient ventilation; if necessary, provide additional

ventilation.

왘 Make sure that the mechanical loading of the rack is even.
왘 When connecting to the power supply, observe the informa-

tion indicated on the NT 3-1 table top power supply. Avoid
circuit overloading. If necessary, provide overcurrent protec­tion.

왘 When rack mounting, please note that intrinsically harmless

leakage currents of the individual power supplies may accu­mulate, thereby exceeding the allowable limit value. As a
remedy, ground the rack via an additional ground connec­tion.

Putting the AC 3 into operation

Rack mounting

one AC 3

왘 Secure the rack mount “ears” 쐅 (supplied with the optional

GA 3 rack adapter) to the AC 3 in the same way as described
for the stacking elements (see page 7).

왘 Secure the blanking plate 쐈 to one of the rack mount

“ears” 쐅 using two recessed head screws (M 6x10)
(see diagram on page 10).

왘 Insert the two blanking plugs 쐉 into the holes of the

blanking plate (see diagram on page 10).

9

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Putting the AC 3 into operation

쐈

쐉

Rack mounting

two devices into

the same 19” slot

쐅

쐅

왘 Slide the AC 3 with the mounted blanking plate 쐈 into the

19” rack.

왘 Secure the rack mount “ear” 쐅 and the blanking plate 쐈 to

the 19” rack.

To rack mount the AC 3 and an SR 300 IEM G3 type transmitter
into the same 19” slot:

왘 Place the two devices side by side upside-down onto a flat

surface:

씈

쐅

10

쐅

왘 Secure the jointing plate 씈 to the devices using six recessed

head screws (M 3x6).

O
3

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왘 Secure the rack mount “ears” 쐅 (supplied with the optional

GA 3 rack adapter) to the devices as described in the section
“Fastening the stacking elements” on page 7.

왘 Slide the devices into the 19” rack.

왘 Secure the rack mount “ears” to the 19” rack.

Connecting devices to the AC 3

Putting the AC 3 into operation

Connecting

the antenna

Connecting

the transmitters

RF IN 1 RF IN 2 RF IN 3 RF IN 4

DC OUT

12V/350mA

USE NT 3-1
DC IN

쐂

We recommend connecting a remote antenna and, if necessary,
using Sennheiser antenna accessories (see “Accessories” on
page 15). For more information, refer to the ew G3 product
page at www.sennheiser.com.

You can connect up to four stationary SR 300 IEM G3 type
transmitters to the AC 3. The active transmitter combiner also
incorporates DC distribution for powering the transmitters:

왘 Connect the transmitter’s antenna output to one of the BNC

sockets RF IN 1 to RF IN 4 쐂. Suitable BNC cables are
included in the delivery.
Transmitters of the ew G3 series do not require their indi-

1

vidual power supply. They are now powered via the BNC
sockets RF IN 1 to RF IN 4 쐂.

Connecting the AC 3 to the mains

For powering the AC 3 and the connected transmitters, you
require the NT 3-1 table top power supply (see “Accessories” on
page 15).

Only use the NT 3-1 table top power supply with the red
DC connector. It is designed for the AC 3 and ensures
safe operation.

RF IN 2 RF IN 3 RF IN 4

C OUT

12V/350mA

USE NT 3-1 ONLY
DC IN

13,8V/3,5A

왘 Pass the cable of the NT 3-1 table top power supply through

the cable grip 쐏.

왘 Insert the red DC connector of the NT 3-1 table top power

supply into the DC IN socket 쐄.

쐏쐄

왘 Plug the NT 3-1 table top power supply into a wall socket.

11

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Using the AC 3

Using the AC 3

Switching the AC 3 on

CAUTION! Risk of fire due to overheating of the AC 3!

.

The AC 3 equipped with a fan to assist dissipation of generated
heat.

왘 Make sure that the air vents 쐆 of the AC 3 are not covered

or blocked.

The fan of the AC 3 is temperature-controlled and oper­ates only when required.

DC
1
2
3

4

왘 Briefly press the STANDBY button 쐃.

쐃
쐇

The operation indicator 쐇 lights up green. The LEDs 1 ... 4 쐋
behave as follows:

쐋

LED 1 ... 4 쐋 Meaning

lights up You have correctly connected an

SR 300 IEM G3 type transmitter;
the supply voltage for the trans­mitter is available at BNC socket

RF IN 1 ... RF IN 4.

does not light up There is a short-circuit in the BNC

socket RF IN 1 ... RF IN 4:

왘 Read the chapter “If a problem

occurs ...” on page 14.

You have connected a transmitter
that is not of the ew G3 series:

12

왘 Make sure that this transmitter

has its own power supply.

The RF signals of the correctly connected transmitters are
combined and transmitted via the connected transmitting
antenna.

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Setting the AC 3 to standby mode

Cleaning the AC 3

DC
1
2
3

4

왘 Press the STANDBY button 쐃 for approx. 2 seconds.

쐃
쐇

쐋

The operation indicator 쐇 and the 4 status LEDs 쐋 go off.
The AC 3 switches to standby mode. Connected transmitters
are switched off, provided that they are powered via the BNC
sockets RF IN 1 to RF IN 4 쐂.

Disconnecting the AC 3 from the mains

DC
1
2
3

4

The STANDBY button 쐃 does not disconnect the AC 3 from the

쐃

mains. To disconnect the AC 3 from the mains:

왘 Unplug the NT 3-1 table top power supply from the wall

socket.
The AC 3 is switched off.

Cleaning the AC 3

CAUTION! Liquids can damage the electronics of the device!

Liquids entering the housing of the device can cause a short­circuit and damage the electronics.

왘 Keep all liquids away from the device.
왘 Do not use any solvents or cleansing agents.

왘 Before cleaning, disconnect the AC 3 from the mains

(see page 13).

왘 Only use a slightly damp cloth to clean the device.

13

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If a problem occurs ...

If a problem occurs ...

Problem Possible cause Possible solution

Transmitters
cannot be
switched on

Disturbed RF
transmission

LED 1 ... 4
does not light
up

Transmitters are
not powered

You have
connected trans­mitters of the
ew G2 series

Antenna is not
connected
correctly

Connection cable
is defective

Excessive RF
signal attenua­tion due to too
long antenna
cable or incorrect
type of antenna
cable

쐋

Short-circuit in
the BNC socket

RF IN 1 ... RF IN 4

You have
connected trans­mitters of the
ew G2 series

Check the connections of
the NT 3-1 table top power
supply and/or check the
BNC sockets RF IN 1 to

RF IN 4 쐂

Make sure that these trans­mitters have their own
power supply

Check the antenna
connection

Replace the connection
cable

Only use the recommended
antenna cable (see “Acces­sories” on page 15)

or use a shorter antenna
cable

or use a low-attenuation
RF cable

Check the antenna
connection

Replace the connection
cable

Make sure that these trans­mitters have their own
power supply

14

If a problem occurs that is not listed in the above table or if the
problem cannot be solved with the proposed solutions, please
contact your local Sennheiser partner for assistance.

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Accessories

The following AC 3 accessories are available from your
Sennheiser partner:

Cat. No. Accessory/spare part

503159 NT 3-1 EU Table top power supply for powering the AC 3

and four transmitters, EU version

503876 NT 3-1 US Table top power supply for powering the AC 3

and four transmitters, 120 V version

503877 NT 3-1 UK Table top power supply for powering the AC 3

and four transmitters, UK version

Mounting material

503167 GA 3 Rack adapter
532711 Stacking elements (1 pair)

Accessories

Antennas

004645 A 1031-U Broadband remote antenna
003658 A 2003-UHF Broadband directional antenna

Antenna cables (coaxial cable)

002324 GZL 1019-A1 Type RG 58, BNC connectors, 1 m
002325 GZL 1019-A5 Type RG 58, BNC connectors, 5 m
002326 GZL 1019-A10 Type RG 58, BNC connectors, 10 m

15

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Specifications

Specifications

Frequency range 500 to 870 MHz
Distribution attenuation 0 dB (±1 dB)
RF input power max. 30 mW per input
Impedance 50
Supply voltage 13.8 V DC

Total current consumption max. 3.4 A

Supply voltage for trans­mitters at RF IN 1 to

RF IN 4

Relative humidity 5 to 95%
Operating temperature range –10°C to +55°C
Storage temperature range –20°C to +70°C
Dimensions of housing approx. 212 x 168 x 43 mm
Weight approx. 1470 g

Ω

(with NT 3-1 table top power
supply)

(with connected transmitters)

11.4 V (protected from reverse
feed), 350 mA

16

Type approvals

In complicance with EMC EN 301489-1/-9

Radio EN 300422-1/-2
Safety EN 60065

Approved by

Canada Industry Canada RSS 210,

IC: 2099A-AC3,
limited to 806 MHz

USA 47 CFR Part 74

FCC-ID: DMOAC3,
limited to 698 MHz

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Manufacturer Declarations

Warranty

Sennheiser electronic GmbH & Co. KG gives a warranty of
24 months on this product.

For the current warranty conditions, please visit our web site at
www.sennheiser.com or contact your Sennheiser partner.

In compliance with the following requirements

• RoHS Directive (2002/95/EU)

• WEEE Directive (2002/96/EU)
Please dispose of the AC 3 at the end of its operational

lifetime by taking it to your local collection point or recy­cling center for such equipment.

CE Declaration of Conformity

Manufacturer Declarations

•

0682

• R&TTE Directive (1999/5/EU)

The declaration is available at www.sennheiser.com.
Before putting the device into operation, please observe the
respective country-specific regulations.

17