Contents

Sennheiser AC 3 Instruction Manual PDF

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Summary of Content for Sennheiser AC 3 Instruction Manual PDF

AC 3 Active Antenna Combiner

Instruction manual

AC 3 | 1

Contents

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

2 | AC 3

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 instruc-

tion 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 the device near water and do not expose it to rain or mois-

ture. 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 Accesso-

ries 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.

AC 3 | 3

Important safety instructions

Intended use of the device

Intended use of the AC 3 includes:

having read and understood this instruction manual especi-

ally 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.

4 | AC 3

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 SR 300 IEM G3 type transmitters can be combined

onto a single antenna.

The AC 3-US version is a special design approved for the U.S./

Canada and is intended as a combiner for he SR 300 IEM G3 A1.

The integral active RF amplifiers ensure that the input signals

are combined onto the common antenna output with no distri-

bution 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 or AC 3-US active transmitter combiner

1 set of device feet

4 BNC 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).

AC 3 | 5

Operating controls

Operating controls

STANDBY button

Operation indicator

4 status LEDs

light up if the supply voltage for the transmitter is avai-

lable 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)

Cable grip for cable of table top power supply

DC IN socket

for connection of NT 3-1 table top power supply

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.

Air vents

BNC socket RF OUT

for connecting the transmitting antenna

ANT

RF OUT

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

USE NT 3-1 ONLY DC IN 13,8V/3,5A

12V/350mADC OUT

DC 1 2 3 4

ANTENNA COMBINER AC 3

6 | AC 3

Block diagram

Block diagram

The below block diagram shows the connections for a 4-channel

system with a single antenna.

AC

DC

NT 3-1 ANT

AC 3

SR 300

RF Output

DC

RF Inputs

SR 300

SR 300

SR 300

STANDBY

DC feed

AC 3 | 7

Putting the AC 3 into operation

Putting the AC 3 into operation

Preparing the AC 3 for use

Setting up the AC 3 on a flat surface

Place the AC 3 on a flat, horizontal surface.

Fastening the

stacking elements

To fasten the stacking elements :

Unscrew and remove the two recessed head screws (M4x8)

on each side of the AC 3.

Secure the stacking elements to the sides of the AC 3

using the previously removed recessed head screws (see

diagram).

The stacking elements (see Accessories on page 15)

are designed to help protect the operating elements

from damage or deformation, e.g. if the AC 3 is

dropped.

Fasten the stacking elements even if you do not

want to stack your AC 3.

Do not fasten the stacking elements when mounting

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

8 | AC 3

Putting the AC 3 into operation

Stacking

several devices

You can stack several AC 3 and the connected transmitters on

top of each other.

.

Stack the devices so that the recesses of the stacking

elements completely engage with each other.

Fitting the

device feet

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

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

feet.

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.

Place the AC 3 on a flat, horizontal surface.

CAUTION! Danger of injury due to toppling stacks!

High stacks can easily topple over.

Place the stack on an absolutely flat surface.

Secure the stack against toppling over.

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.

Please note that the device feet can leave stains on deli-

cate surfaces!

AC 3 | 9

Putting the AC 3 into operation

Mounting the AC 3 into a 19 rack

Rack mounting

one AC 3

Secure the rack mount ears (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).

Secure the blanking plate to one of the rack mount

ears using two recessed head screws (M 6x10)

(see diagram on page 10).

Insert the two blanking plugs into the holes of the blan-

king plate (see diagram on page 10).

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 tempera-

ture, the mechanical loading and the electrical potentials will be

different from those of devices which are not mounted into a

rack.

The ambient temperature within the rack must not exceed

the temperature limit specified in the specifications.

Ensure sufficient ventilation; if necessary, provide additional

ventilation.

Make sure that the mechanical loading of the rack is even.

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 protec-

tion.

When rack mounting, please note that intrinsically harmless

leakage currents of the individual power supplies may accu-

mulate, thereby exceeding the allowable limit value. As a

remedy, ground the rack via an additional ground connec-

tion.

10 | AC 3

Putting the AC 3 into operation

Slide the AC 3 with the mounted blanking plate into the

19 rack.

Secure the rack mount ear and the blanking plate to

the 19 rack.

Rack mounting

two devices into

the same 19 slot

To rack mount the AC 3 and an SR 300 IEM G3 type transmitter

into the same 19 slot:

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

surface:

Secure the jointing plate to the devices using six recessed

head screws (M 3x6).

AC 3 | 11

Putting the AC 3 into operation

Secure the rack mount ears (supplied with the optional

GA 3 rack adapter) to the devices as described in the section

Fastening the stacking elements on page 7.

Slide the devices into the 19 rack.

Secure the rack mount ears to the 19 rack.

Connecting devices to the AC 3

Connecting

the antenna

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.

Connecting

the transmitters

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:

Connect the transmitters antenna output to one of the BNC

sockets RF IN 1 to RF IN 4 . Suitable BNC cables are

included in the delivery.

Transmitters of the ew G3 series do not require their indivi-

dual power supply. They are now powered via the BNC

sockets RF IN 1 to RF IN 4 .

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).

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

the cable grip .

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

supply into the DC IN socket .

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

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

USE NT 3-1 O DC IN 13

12V/350mADC OUT

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

USE NT 3-1 ONLY DC IN 13,8V/3,5A

12V/350mADC OUT

12 | AC 3

Using the AC 3

Using the AC 3

Switching the AC 3 on

.

Briefly press the STANDBY button .

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

The RF signals of the correctly connected transmitters are

combined and transmitted via the connected transmitting

antenna.

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

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

heat.

Make sure that the air vents 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

LED 1 ... 4 Meaning

lights up You have correctly connected an

SR 300 IEM G3 type transmitter;

the supply voltage for the trans-

mitter 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:

Read the chapter If a problem

occurs ... on page 14.

You have connected a transmitter

that is not of the ew G3 series:

Make sure that this transmitter

has its own power supply.

AC 3 | 13

Cleaning the AC 3

Setting the AC 3 to standby mode

Press the STANDBY button for approx. 2 seconds.

The operation indicator and the 4 status LEDs 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 .

Disconnecting the AC 3 from the mains

The STANDBY button does not disconnect the AC 3 from the

mains. To disconnect the AC 3 from the mains:

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

socket.

The AC 3 is switched off.

Cleaning the AC 3

Before cleaning, disconnect the AC 3 from the mains

(see page 13).

Only use a slightly damp cloth to clean the device.

DC 1 2 3 4

DC 1 2 3 4

CAUTION! Liquids can damage the electronics of the device!

Liquids entering the housing of the device can cause a short-

circuit and damage the electronics.

Keep all liquids away from the device.

Do not use any solvents or cleansing agents.

14 | AC 3

If a problem occurs ...

If a problem occurs ...

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.

Problem Possible cause Possible solution

Transmitters

cannot be

switched on

Transmitters are

not powered

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

You have

connected trans-

mitters of the

ew G2 series

Make sure that these trans-

mitters have their own

power supply

Disturbed RF

transmission

Antenna is not

connected

correctly

Check the antenna

connection

Connection cable

is defective

Replace the connection

cable

Excessive RF

signal attenua-

tion due to too

long antenna

cable or incorrect

type of antenna

cable

Only use the recommended

antenna cable (see Acces-

sories on page 15)

or use a shorter antenna

cable

or use a low-attenuation

RF cable

LED 1 ... 4

does not light

up

Short-circuit in

the BNC socket

RF IN 1 ... RF IN 4

Check the antenna

connection

Replace the connection

cable

You have

connected trans-

mitters of the

ew G2 series

Make sure that these trans-

mitters have their own

power supply

AC 3 | 15

Accessories

Accessories

The following AC 3 accessories are available from your Senn-

heiser partner:

Cat. No. Accessory/spare part

568834 NT 3-1C EU Table top power supply for powering the AC 3

and four transmitters, EU version

568835 NT 3-1C US Table top power supply for powering the

AC 3-US and four transmitters, 120 V version

568836 NT 3-1C 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)

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

16 | AC 3

Specifications

Specifications

In complicance with

Approved by

Frequency range AC 3: 500 to 870 MHz

AC 3-US: 470 to 698 MHz

Distribution attenuation 0 dB (1 dB)

RF input power max. 30 mW per input

Impedance 50 Supply voltage 13.8 V DC

(with NT 3-1 table top power

supply)

Total current consumption max. 3.4 A

(with connected transmitters)

Supply voltage for trans-

mitters at RF IN 1 to

RF IN 4

11.4 V (protected from reverse

feed), 350 mA

Relative humidity 5 to 95%

Operating temperature range 10C to +55C

Storage temperature range 20C to +70C

Dimensions of housing approx. 212 x 168 x 43 mm

Weight approx. 1470 g

Europe EMC EN 301489-1/-9

Radio EN 300422-1/-2

Safety EN 60065

Canada Industry Canada RSS 210,

IC: 2099A-AC3,

limited to 698 MHz

USA CAN ICES-3(B)/NMB-3(B)

47 CFR Part 74

FCC-ID: DMOAC3,

limited to 698 MHz

AC 3 | 17

Manufacturer Declarations

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

WEEE Directive (2012/19/EU)

Please dispose of the AC 3 at the end of its operational

lifetime by taking it to your local collection point or recy-

cling center for such equipment.

CE Declaration of Conformity

RoHS Directive (2011/65/EU)

R&TTE Directive (1999/5/EG)

The declaration is available at

www.sennheiser.com/download. Before putting the device

into operation, please observe the respective country-specific

regulations.

Australia

18 | AC 3

Manufacturer Declarations

FCC & Industry Canada Information

This device complies with Part 15 of the FCC Rules. Operation is

subject to the following two conditions:

(1) This device may not cause harmful interference, and

(2) this device must accept any interference received, including

interference that may cause undesired operation.

This class B digital device complies with the Canadian ICES-003.

Changes or modifications made to this equipment not expressly

approved by Sennheiser electronic Corp. may void the FCC

authorization to operate this equipment. Before putting the

device into operation, please observe the respective country-

specific regulations!

Radiofrequency radiation exposure information:

This equipment complies with FCC and IC radiation exposure

limits set forth for an uncontrolled environment. The AC 3

should be installed and operated with a minimum distance of

20 cm between the radiator and your body.

Sennheiser electronic GmbH & Co. KG

Am Labor 1, 30900 Wedemark, Germany www.sennheiser.com Pub

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