Sennheiser SpeechLine Digital Wireless User Manual
SpeechLine Digital Wireless
Antenna solutions and recommendations
on antenna mounting for the SL Rack Receiver DW
Sennheiser electronic GmbH & Co. KG
Am Labor 1, 30900 Wedemark, Germany, www.sennheiser.com
AN 1106 v2.0
Antenna solutions and recommendations on antenna mounting
SpeechLine Digital Wireless - SL Rack Receiver DW
Contents
Antenna solutions for SpeechLine Digital Wireless.................................3
Antenna setup planning for SpeechLine Digital Wireless......................... 3
Mounting instructions for the AWM 2 and AWM 4 ..............................3
Antenna mounting options ......................................................4
Option 1:
Connecting the AWM 2/AWM 4 directly to the receiver(s)........................4
Option 2:
Combining multiple links to one AWM 2/AWM 4................................ 6
Option 3:
Rack mounting - front.......................................................10
Option 4:
Rack mounting - rear .......................................................10
Further important information on antenna usage .................................11
Reflecting surfaces.........................................................11
Blocking effects from other transmitters ......................................12
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Antenna solutions and recommendations on antenna mounting
SpeechLine Digital Wireless - SL Rack Receiver DW
Antenna solutions for SpeechLine Digital Wireless
This document gives an overview over several possibilities of mounting and using antennas for a
SpeechLine Digital Wireless system. Furthermore, this document provides recommendations on
several aspects which should be considered for the different antenna solutions.
Antenna setup planning for SpeechLine Digital Wireless
When planning the installation of SpeechLine Digital Wireless rack receivers and antennas for each
room, observe the following guidelines:
f Mount all SpeechLine Digital Wireless receivers of one room together in one rack.
f Make sure to have a direct line of sight between the transmitters and the receiving antennas.
f Depending on the room characteristics there are several options how to install the receiving
antennas. We recommend the following options in this order:
• Option 1: remotely mounted using the AWM 2 for one receiver or AWM 4 for two receivers
• Option 2: remotely mounted using the AWM 2 or AWM 4 with multiple receivers combined
(passive combiner)
• Option 3: mounted in a rack (front)
• Option 4: mounted in a rack (rear)
f When mounting antennas remotely, observe the minimum distance to possibly existing DECT
access points and also take into account the cable lengths.
f Always switch all receivers on and off with a common power supply (e.g. a multi-outlet power
strip with a central on/off switch) in order to achieve the best performance of a system.
For further technical details and recommendations on the four options please refer to the
chapter „Antenna mounting options“ starting on the next page.
Mounting instructions for the AWM 2 and AWM 4
When using the AWM 2 or AWM 4 please observe the respective mounting instructions. You will
find them in the download sections of the respective product pages:
www.sennheiser.com/awm-2
www.sennheiser.com/awm-4
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Antenna solutions and recommendations on antenna mounting
SpeechLine Digital Wireless - SL Rack Receiver DW
Antenna mounting options
As mentioned above, there are multiple possibilities for remote mounting the anntennas. In the
following, we will explain the most common options with additional recommendations in order of
preference.
Option 1: Connecting the AWM 2/AWM 4 directly to the receiver(s)
You can connect one receiver directly to one AWM 2 antenna wall mount or you can connect two
receivers directly to one AWM 4 antenna wall mount.
AWM 4AWM 2
CL 5 (5 m / 16.4 ft)
CL 10 (10 m / 32.8 ft)
CL 20 (20 m / 65.6 ft)
CL 1 PP (1 m / 3.3 ft)
CL 5 PP (5 m / 16.4 ft)
CL 10 PP (10 m / 32.8 ft)
CL 20 PP (20 m / 65.6 ft)
Link I - Ant ILink I - Ant II Link II - Ant ILink II - Ant II
SL Rack Receiver DWSL Rack Receiver DW SL Rack Receiver DW
Signal loss due to extension cables
In this scenario, using extension cables for remote antenna mounting results in a loss of transmission power, depending on the cable length. You can compensate this signal loss by configuring the
transmission power of the receiver accordingly.
f Observe the following minimum transmission power settings (SL Rack Receiver DW: System
Settings menu -> RF Power) for the respective cable lengths:
• Cable length of 5 m -> at least level 1
• Cable length of 10 m -> selected level +1, at least level 2
• Cable length of 20 m -> selected level +1, at least level 3
• Cable length of 25 m and longer -> selected level +2, at least level 4
f The Sennheiser CL antenna cables have the following attenuation:
CL 5 2.5 dB CL 1 PP 0.5 dB
CL 10 5 dB CL 5 PP 2.5 dB
CL 20 10 dB CL 10 PP 5 dB
CL 20 PP 10 dB
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