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Active Transmitter Combiner 8:1
Instructions for use
AC 3000
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Contents
Brief description .................................................................... 2
Safety instructions ............................................................... 2
Delivery includes ................................................................... 4
Operating elements .............................................................. 4
Connection diagram ............................................................. 5
Putting the unit into operation .......................................... 5
Operation ................................................................................ 7
Troubleshooting .................................................................... 7
Accessories ............................................................................. 8
Specifications ......................................................................... 8
Manufacturer declarations .................................................. 9
Brief description
With the AC 3000 8-to-1 active transmitter combiner, the signals
of up to eight SR 3054 transmitters or up to four SR 3056 twin
transmitters can be combined onto a single antenna (A 2003 UHF
directional antenna or A 1031 U omni-directional antenna).
The active transmitter combiner allows you to make highquality transmission systems with up to 8 channels.
Areas of application:
y
Multi-channel in-ear monitoring system for broadcast or stage use
y
Multi-channel system suitable for any application where talk-back
signals are to be transmitted (e.g. studio)
Safety instructions
Danger!
Overheating or overvoltages (caused by lightning striking the
mains supply etc.) can cause units with a mains connection to
catch fire!
Always set up the unit in a well-ventilated place! Make sure that
the air vents of the unit are not covered or blocked! Never stack
more than two units directly one above the other! Do not set up
the unit near any heat sources and never expose the unit to
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direct sunlight (see page 15)! Use an overvoltage protection
or, during a thunderstorm, disconnect the unit from the mains!
Warning!
If you open units or use damaged mains cables, you can
receive a dangerous electric shock!
Never open the unit and only use undamaged mains cables!
If a unit should be defective, repair must be carried out by
authorized personnel! If units are opened by you in breach
of this instruction, the warranty becomes null and void.
Warning!
If units and cables are set up improperly, persons can be
injured or units can be damaged!
Set up the unit on an even surface or mount it into a rack!
Lay the cables in such a way that no-one can stumble over
them!
Attention!
If liquids or small parts which conduct electricity find their
way into the interior or to the sockets of the unit, this can
cause a short-circuit which may damage the unit!
Keep liquids and small parts which conduct electricity away
from the unit! Use a damp cloth for cleaning the unit. Do not
use any solvents or cleansing agents!
Attention!
The AC 3000 contains mechanically moving parts (fans).
Since dust and pollution can impair their function, you should
regularly check the fans for proper operation and clean out
any dust if necessary. The failure of one or several fans can
cause overheating and permanent damage to the unit.
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Delivery includes
y 1 active transmitter combiner 8:1
y 1 mains cable
y 1 rack-mounting kit
y 4 set of self-adhesive plastic feet
y 1 instruction manual
You additionally require BNC cables for connecting the
transmitters and the antenna to the AC 3000, an antenna
(A 2003 UHF passive directional antenna or A 1031 U passive omni-directional antenna) and up to eight SR 3054
transmitters or up to four SR 3056 twin transmitters.
Unused inputs do not require a terminating resistor.
Operating elements
8
POWER LED
POWER (ON/OFF) switch
8 RF inputs RF IN 1 to RF IN 8 for connecting the
transmitters
3 low-noise fans
BNC socket for antenna output ANT
IEC mains socket
8 LEDs for RF signal indication
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Connection diagram
The below connection diagram shows the connections for
an 8-channel system.
ANT
8:1
Putting the unit into operation
Setting up the unit
왘 Set up the AC 3000 on an even, horizontal surface so that
it cannot fall over or mount it into a 19" rack.
Warning!
During operation, the AC 3000 and the connected
transmitters produce considerable waste heat! Make
sure that the air vents of the units are not covered or
blocked and provide for a duct of sufficient size to ensure
a free air flow between the units – especially when
mounting several transmitter combiners or transmitters
into a desk, chassis or rack! Never stack more than two
units directly one above the other!
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Connecting the antenna
The AC 3000 active transmitter combiner can be used with
either the A 2003 UHF directional antenna or the A 1031 U
omni-directional antenna. The antenna transmits the signals of all connected transmitters. The signals are combined
onto the antenna output with no distribution attenuation.
왘 Connect the antenna to the antenna output ANT .
Note:
Each AC 3000 requires its own antenna! Several
AC 3000s cannot be daisy-chained!
Connecting the transmitters
You can connect up to eight SR 3054 transmitters or up to
four SR 3056 twin transmitters to the AC 3000.
왘 Use 50-Ohm BNC cables to connect the transmitters to
the RF inputs RF IN 1 to RF IN 8 .
Connecting the mains cable
왘 Connect the mains cable to the IEC mains socket and
to the mains.
Note:
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The AC 3000 can be connected to any mains power
supply with 100 V to 240 V AC (50 to 60 Hz).
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Operation
Turning the AC 3000 on and off
왘 To turn the AC 3000 on, press the POWER (ON/OFF)
switch .
The POWER LED lights up red.
왘 To turn the AC 3000 off, press the POWER (ON/OFF)
switch once more. The POWER LED goes off.
RF signal indication
왘 The AC 3000 features eight control LEDs which will
light up if an input signal is present at the corresponding
input.
Troubleshooting
One or several LEDs for input signal indication do not
light up
왘 Check if transmitters are connected to the corresponding
inputs.
왘 Check if the corresponding transmitters are turned on.
Disturbed reception or no reception
Possible causes:
y Transmitting antennas are not within the reception area
y Transmitters or receivers are not turned on
y Batteries are not inserted into the receiver or batteries
are low
y The antennas are not connected correctly
y The connecting cables are defective
y Too high cable attenuation due to too long antenna
cables or wrong type of antenna cable
y The selected transmission and receiving frequencies are
not within the frequency window
y The frequencies are not intermodulation-free
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Accessories
The following accessories are available from Sennheiser:
A 2003 UHF Passive directional antenna Cat. No. 03658
A 1031 U Passive omni-directional antenna
Cat. No. 04645
GZL 1019 A1 BNC-BNC coaxial cable, length 1 m
Cat. No. 02324
GZL 1019 A5 BNC-BNC coaxial cable, length 5 m
Cat. No. 02325
GZL 1019 A10 BNC-BNC coaxial cable, length 10 m
Cat. No. 023266
Specifications
Antenna combiner 8-to-1
Frequency range 470 – 870 MHz
Distribution attenuation 0 dB (±1 dB)
RF input power max. 100 mW per input
Impedance 50 Ω
Power supply 100 V – 240 V AC, 50 – 60 Hz
Current consumption max. 120 VA
Temperature range –10 °C to +55°C
Weight 3 kg
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Manufacturer declarations
Warranty regulations
The guarantee period for this Sennheiser product is 24 months from the date
of purchase. Excluded are accessory items, rechargeable or disposable batteries that are delivered with the product; due to their characteristics these products have a shorter service life that is principally dependent on the individual
frequency of use.
The guarantee period starts from the date of original purchase. For this reason,
we recommend that the sales receipt be retained as proof of purchase. Without this proof (which is checked by the responsible Sennheiser service partner) you will not be reimbursed for any repairs that are carried out.
Depending on our choice, guarantee service comprises, free of charge, the
removal of material and manufacturing defects through repair or replacement
of either individual parts or the entire device. Inappropriate usage (e.g. operating faults, mechanical damages, incorrect operating voltage), wear and tear,
force majeure and defects which were known at the time of purchase are excluded from guarantee claims. The guarantee is void if the product is manipulated
by non-authorised persons or repair stations.
In the case of a claim under the terms of this guarantee, send the device, including acces-sories and sales receipt, to the responsible service partner. To minimise the risk of transport damage, we recommend that the original packaging
is used. Your legal rights against the seller, resulting from the contract of sale,
are not affected by this guarantee.
The guarantee can be claimed in all countries outside the U.S. provided that no
national law limits our terms of guarantee.
CE Declaration
of Conformity
This equipment is in compliance with the essential requirements and other
relevant provisions of Directives 1999/5/EC, 89/336/EC or 73/23/EC. The
declaration is available on the internet site at www.sennheiser.com.
Before putting the device into operation, please observe the respective country-specific regulations!
WEEE Declaration
Your Sennheiser product was developed and manufactured with
highquality materials and components which can be recycled and/
or reused. This symbol indicates that electrical and electronic equipment must be disposed of separately from normal waste at the end
of its operational lifetime.
Please dispose of this product by bringing it to your local collection point
or recycling centre for such equipment. This will help to protect the environment in which we all live.
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Sennheiser electronic GmbH & Co. KG
30900 Wedemark, Germany
Phone +49 (5130) 600 0
Fax +49 (5130) 600 300
www.sennheiser.com
Printed in Germany Publ. 04/06 093908 / A04
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