Sennheiser ASA 1 User manual

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1
Contents
Important safety instructions ........................................................ 2
The ASA 1 active antenna splitter ................................................ 4
Delivery includes ............................................................................... 4
Operating elements ......................................................................... 5
Putting the ASA 1 into operation .................................................. 7
Preparing the ASA 1 for use ................................................................. 7
Connecting devices to the ASA 1 and
switching the ASA 1 on ....................................................................... 12
Making an 8-channel system using the ASA 1 ............................... 14
Cleaning the ASA 1 ......................................................................... 16
If a problem occurs ... ..................................................................... 16
Accessories and spare parts ......................................................... 17
Specifications .................................................................................. 18
Manufacturer Declarations ........................................................... 19
Thank you for choosing Sennheiser!
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 re
ad these instructions carefully,
as we want you to enjoy your new Sennheiser products quickly
and to the fullest.

2
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.
 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 NT 1-1 mains unit.
 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.

3
Important safety instructions
Intended use of the device
Intended use of the ASA 1 includes:
 having read and understood this instruction manual
especially 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 ASA 1 other than as described
in this instruction manual, or under operating conditions which
differ from those described herein.

4
The ASA 1 active antenna splitter
The ASA 1 active antenna splitter
The ASA 1 active antenna splitter has been designed to enable
routing of UHF antenna signals to several receivers in a multi-
channel system. Up to four diversity receivers may be supplied
with signal by only two antennas. The integral RF amplifiers
ensure that the ASA 1 does not introduce any additional UHF
signal loss.
The ASA 1 incorporates DC distribution to enable simultaneous
powering of up to four receivers and two antenna boosters via
its BNC sockets. The antenna boosters may be required in order
to compensate for cable losses due to long antenna cables.
A single NT 1-1 mains unit (to be ordered separately) is
required to power the ASA 1, the connected receivers and
antenna boosters.
By linking two ASA 1, an 8-channel diversity system can be
operated with only two antennas.
Using the GA 3 rack adapter, two ASA 1 or one ASA 1 and one
stationary receiver (e.g. EM 100 G3, EM 300 G3 or EM 500 G3)
can be mounted into a 19 rack.
The ASA 1 is suitable for the following areas of application:
 Multi-channel RF installations
 Permanent installations in small conference centres and
similar venues
Delivery includes
1 ASA 1 antenna splitter
1 set of device feet
8 BNC cables
1 instruction manual
You additionally require the NT 1-1 mains unit with a suitable
mains connector (see Accessories and spare parts on
page 17).

5
Operating elements
Operating elements
On/Off button
Operation indicator
Cable grip for cable of mains unit
DC IN socket
for connection of NT 1-1 mains unit
BNC socket RF OUT A
RF output only for connection of an additional ASA 1
(to create a 1-to-8 diversity splitter)
Four BNC sockets A1 to A4
RF outputs of diversity section A for connection of
the receivers
Each of these RF outputs can power one receiver.
BNC socket ANT RF IN A
antenna input of diversity section A
BNC socket ANT RF IN B
antenna input of diversity section B
Four BNC sockets B1 to B4
RF outputs of diversity section B for connection of
the receivers

6
Operating elements
Block diagram
The below block diagram (also depicted on the base of the
device) shows the signal flow in the device.

7
Putting the ASA 1 into operation
Putting the ASA 1 into operation
Preparing the ASA 1 for use
For table-top use, fix the device feet to the base of the ASA 1.
Do not fit the device feet when mounting the ASA 1 into a
19 rack.
Ensure that the base of the ASA 1 is clean and free from
grease before fitting the device feet.
Fix the device feet to the base of the ASA 1 by peeling off
the backing paper and fitting them as shown on the left.
Place the ASA 1 on a flat, horizontal surface.
Fastening the stacking elements (see Accessories and spare
parts on page 17)
The stacking elements are designed to help protect the
operating elements from damage or deformation, e.g. if the
ASA 1 is dropped.
To fasten the stacking elements:
Unscrew and remove the four recessed head screws (M4x8).
Secure the stacking elements to the ASA 1.
CAUTION! Risk of staining of surfaces!
Some surfaces have been treated with varnish, polish or
synthetics which might cause stains when they come into
contact with other synthetics. Despite a thorough testing of the
synthetics used by us, we cannot rule out the possibility of
staining.
Do not place the ASA 1 on delicate surfaces.

8
Putting the ASA 1 into operation
Stacking several ASA 1
You can stack the ASA 1 and the receivers on top of each other.
.
Stack the devices so that the recesses of the stacking
elements completely engage with each other.
Mounting the ASA 1 into a 19 rack
Do not fit the device feet when mounting the ASA 1 into a
19 rack.
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.
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.
The ambient temperature within the rack must not exceed
the temperature limit specified in the specifications.
When rack mounting, take good care not to affect the
ventilation required for safe operation. If necessary, provide
additional ventilation.
Make sure that the mechanical loading of the rack is even.
When connecting to the power supply, observe the
information indicated on the type plate. Avoid circuit
overloading. If necessary, provide overcurrent protection.

9
Putting the ASA 1 into operation
For rack mounting the ASA 1, you require (see Accessories and
spare parts on page 17):
 the GA 3 19 rack adapter
Unscrew and remove the two recessed head screws (M4x8)
on one side of the ASA 1.
Hold one rack mount ear to the ASA 1.
Secure the rack mount ear to the side of the ASA 1
using the two recessed head screws.
Repeat for the other rack mount ear as described above.
Secure the blanking plate to one of the rack mount
ears using two recessed head screws (M 6x10).
If you do not want to front mount the antennas:
Insert the two blanking plugs into the holes of the
blanking plate.
When rack mounting, please note that intrinsically harmless
leakage currents of the individual mains units may
accumulate, thereby exceeding the allowable limit value. As
a remedy, ground the rack via an additional ground
connection.

10
Putting the ASA 1 into operation
If you want to front mount the antennas:
Use the optional AM 2 antenna front mount kit (see
Accessories and spare parts on page 17).
If you want to use remote antennas (see Accessories and spare
parts on page 17):
Connect the remote antennas.
To mount the ASA 1 into the rack:
Slide the ASA 1 with the mounted blanking plate into the
19 rack.
Secure the rack mount ears to the 19 rack.
If you are using the rod antennas :
Align the antennas in a V-shape to obtain the best possible
reception.

11
Putting the ASA 1 into operation
Place the two devices (e.g. the ASA 1 and a stationary
receiver) side by side upside-down onto a flat surface:
Secure the jointing plate to the devices using six recessed
head screws (M 3x6).
Secure the rack mount ears to the devices as described
in the section Rack mounting one ASA 1 on page 9.
To mount the antennas:
Use remote antennas.
To mount the devices into the rack:
Slide the devices into the 19 rack.
Secure the rack mount ears to the 19 rack.

12
Putting the ASA 1 into operation
Connecting devices to the ASA 1 and switching
the ASA 1 on
Connecting the antennas
You can connect the following antenna types to the antenna
inputs and :
 two A 1031-U or A 2003-UHF passive antennas
 or a combination of passive antenna (A 1031-U or
A 2003-U) and antenna booster (AB 3).
Connecting the receivers
You can connect up to four stationary receivers (e.g. EM 100 G3,
EM 300 G3 or EM 500 G3) to the ASA 1. The splitter also
incorporates DC distribution for powering the receivers.
Connect one of the receivers antenna inputs to one of the
BNC sockets A1 to A4 . Suitable BNC cables are included in
the delivery.
These receivers do not require their individual power supply.
They are now powered via the BNC sockets A1 to A4 .
Connect the other antenna input of the receiver to one of
the BNC sockets B1 to B4 . Suitable BNC cables are
included in the delivery.
Recommendation for optimum reception
To ensure optimum reception even under difficult
reception conditions, we recommend using remote
antennas.

13
Putting the ASA 1 into operation
Connecting the ASA 1 to the mains
For powering the ASA 1, the connected receivers and two
optional antenna boosters, you require the NT 1-1 mains unit
(see Accessories and spare parts on page 17).
Pass the cable of the NT 1-1 mains unit through the cable
grip .
Insert the blue DC connector of the NT 1-1 mains unit into
the DC IN socket .
Plug the mains unit into a wall socket.
The operation indicator lights up green. The ASA 1 is
ready for operation.
Switching the ASA 1 on
Briefly press the On/Off button .
The operation indicator lights up green. The RF signals of
the connected antennas are distributed to all connected
receivers.
Setting the ASA 1 to standby mode
Press the On/Off button for approx. 2 seconds.
The operation indicator goes off. The ASA 1 switches to
standby mode. Connected antenna boosters are switched
off. Connected receivers are switched off, provided that they
are powered via the BNC sockets A1 to A4 .
Disconnecting the ASA 1 from the mains
The On/Off button only deactivates the supply voltage for
the antenna boosters and receivers but does not disconnect the
ASA 1 from the mains. To disconnect the ASA 1 from the mains:
Unplug the mains unit from the wall socket.
The operation indicator goes off. The ASA 1 is switched
off.
Using the correct mains unit
Only use the NT 1-1 mains unit with the blue DC
connector. It is designed for the ASA 1 and ensures safe
operation.

14
Putting the ASA 1 into operation
Making an 8-channel system using the ASA 1
There are two ways to link two ASA 1 together to create a 1-to-8 diversity splitter:
First possibility: Two antennas supply an 8-channel system
* AB-3 antenna boosters are only required for longer antenna cables (from approx.
10 m).
AB 3* AB 3*
ASA 1 ASA 1

15
Putting the ASA 1 into operation
Second possibility: Linking two 4-channel systems
* AB-3 antenna boosters are only required for longer antenna cables (from approx.
10 m).
AB 3* AB 3*
ASA 1 ASA 1

16
Cleaning the ASA 1
Cleaning the ASA 1
Before cleaning, disconnect the ASA 1 from the mains (see
page 13).
Only use a slightly damp cloth to clean the device.
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.
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.
Problem Possible cause Possible solution
Receivers
cannot be
switched on
Receivers are not
powered
Check the connections
of the NT 1-1 mains unit
and/or check the BNC
sockets A1 to A4
Disturbed RF
reception
Antennas are not
connected correctly
Check the antenna
connections (see page 12)
Connection cables are
defective
Replace the connection
cables
Excessive RF signal
attenuation due to too
long antenna cables
or incorrect type of
antenna cable
Only use the recommended
antenna cables (see
page 17)
or use shorter antenna
cables
or use AB-3 antenna
boosters from the matching
frequency range and
connect them the correct
way round

17
Accessories and spare parts
Accessories and spare parts
The following ASA 1 accessories are available from your
Sennheiser partner:
Accessory/spare part
NT 1-1 EU Mains unit for powering the ASA 1,
four receivers and two antenna boosters,
EU version
NT 1-1 US Mains unit for powering the ASA 1,
four receivers and two antenna boosters,
120 V version
NT 1-1 UK Mains unit for powering the ASA 1,
four receivers and two antenna boosters,
UK version
Mounting material
GA 3 Rack adapter
AM 2 Antenna front mount kit
(for GA 3 rack adapter)
Stacking elements (1 pair)
Antennas
A 1031-U Broadband remote antenna
A 2003-UHF Broadband directional antenna
Antenna boosters
AB 3-A: 516558 MHz
AB 3-G: 566608 MHz
AB 3-B: 626668 MHz
AB 3-C: 734776 MHz
AB 3-D: 780822 MHz
AB 3-E: 823865 MHz
Antenna cables (coaxial cable)
GZL 1019-A1 Type RG 58, BNC connectors, 1 m
GZL 1019-A5 Type RG 58, BNC connectors, 5 m
GZL 1019-A10 Type RG 58, BNC connectors, 10 m

18
Specifications
Specifications
Type approvals
ASA 1 antenna splitter 2 x 1:4 or 1 x 1:8, active
Antenna cable 8 items, 50 cm, BNC
Frequency range 500 to 870 MHz at 3 dB
Amplification In A  Out A 0 ± 1 dB
Amplification In A  Out A1 ... A4 0 ± 1 dB
Amplification In B  Out B1 ... B4 0 ± 1 dB
Impedance 50
Operating voltage 13.8 V DC (with NT 1-1 mains unit)
Total current consumption max. 2.0 A with 4 receivers and 2 antenna boosters
Supply voltage of antenna boosters
at ANT RF IN A and ANT RF IN B 12 V, 130 mA
Supply voltage of receivers at
A1 ... A4 12 V (protected from reverse feed), 350 mA
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. 1090 g
In compliance with EMC EN 301489-1/-9
Radio EN 300422-1/-2
Safety EN 60065
47 CFR 15 subpart B
Approved by Industry Canada RSS 210, IC: 2099A-G3 EM 100

19
Manufacturer Declarations
Manufacturer Declarations
Warranty
Sennheiser electronic GmbH & Co. KG gives a warranty of
24 months on this product.
Additional warranty conditions can be found on our website at
www.sennheiser.com under Service & Support and Terms of
Warranty.
CE Declaration of Conformity
This device is in compliance with the essential requirements
and other relevant provisions of Directive 1999/5/EC. The
declaration is available at www.sennheiser.com.
Before putting the device into operation, please observe the
respective country-specific regulations.
Statements regarding FCC and industry Canada
This device complies with Part 15 of the FCC Rules and with
RSS-210 of Industry Canada. 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 inter-
ference that may cause undesired operation.
Changes or modifications made to this equipment not expressly
approved by Sennheiser electronic Corp. may void the FCC
authorization to operate this equipment.