Sennheiser ACA 1 User Manual
Active Antenna Combiner
ACA 1
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Instruction manual
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Contents
Important safety instructions . . . . . . . . . . . . . . . . . . . 2
The ACA 1 active antenna combiner . . . . . . . . . . . . . . 4
Delivery includes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Product Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Operating controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Front side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Rear side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Putting the ACA 1 into operation . . . . . . . . . . . . . . . . 8
Preparing the ACA 1 for use . . . . . . . . . . . . . . . . . . . . . 8
Using the ACA 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Example 1: Studio Complex . . . . . . . . . . . . . . . . . . . . 14
Example 2: Large Church . . . . . . . . . . . . . . . . . . . . . . . 15
Cleaning the ACA 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
If a problem occurs ... . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Manufacturer Declarations . . . . . . . . . . . . . . . . . . . . . 21
Contents
1
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 the device near water and do not expose it to rain or moisture. Do not place objects filled with liquids, such as vases or
coffee cups, on the device.
•Only use the NT3-1 table top power supply (see “Accessories” on page 18).
•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
Important safety instructions
Intended use of the device
Intended use of the ACA 1 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
limitations described in this instruction manual.
“Improper use” means using the ACA 1 other than as described
in this instruction manual, or under operating conditions which
differ from those described herein.
3
The ACA 1 active antenna combiner
The ACA 1 active antenna
combiner
ACA 1 is a compact, cost-effective and easy to deploy antenna
combiner to allow Wireless Microphone coverage over multiple
rooms and large or complex sites such as large churches,
broadcast installations, outdoor sporting events and reality TV
shows.
With the ACA 1 2-channel active antenna combiner, the
received signals of up to four active or passive antennas per
channel can be combined for one receiver or receiver system.
Two channels (A, B) are available.
Multiple ACA 1 units may be combined to cater for systems with
more than four diversity pairs of antennas.
Delivery includes
1ACA1 active antenna combiner
1NT 3-1 mains power supply
2BNC cables 0.5m, 50 ohm
1instruction manual
4
Product Features
Product Features
RF function
2 x 4:1 combiner at unity gain
Switchable DC
Supplied on antenna each input for head amplifiers or active
antennas, e.g. AB 3, AB 3700, A12-AD, AB 1036
Switchable RF
RF from each of the eight antenna inputs is switchable to isolate
unused antennas
Visual indication
LEDs indicate input state; RF ON, DC ON and DC LIMIT (current
overload).
5
Operating controls
& '() *
Operating controls
Front side
INPUT A / INPUT B: two groups of identical switches and LEDs
according to the rear side antenna inputs IN A1-IN A4 and
IN B1-IN B4:
! RF ON / OFF / DC & RF ON switch to select active/passive
antennas
" DC ON / DC LIMIT Status LED
GRN (green)- indicates DC ON
RED - indicates DC overload (> 250 mA)
# RF ON Status LED
$ STANDBY button
% Operation indicator
6
Operating controls
./0
Rear side
IN A1 to IN A4 / IN B1 to IN B4: 2 x 4 identical antenna inputs
+ IN A1 to IN A4 / IN B1 to IN B4: 2 channels (A, B) with 4 BNC
sockets for connecting active or passive antennas. Each of
these RF inputs can power one active antenna or booster.
, 1 BNC socket OUT A / OUT B per channel for connecting a
receiver or receiver system
- DC IN socket for connecting the NT 3-1 table top power
supply
CAUTION!
Connecting transmitters to the ^cejihdgoutputs can
damage the elec-tronics of the device!
The outputs are provided for connecting receivers. Connecting
the ACA 1 to transmitters will cause malfunction and could
result in permanent damage
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7
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