User's Manual

MCW-D 50 – Control Unit
38
3.4 Remote Supply of the Antenna Amplifier via the Control Unit**
The antenna amplifiers can be supplied remotely via the MCW-D 50 control unit. On the rear of the MCW-D 50 control unit there is a
status LED .
This LED will illuminate green, when the remote supply voltage is 5 V at all antenna sockets.
The LED is flashing red rapidly, when there is a short-circuit at the antenna socket. In this case check the antenna cables.
The remote supply voltage of 5 V supplies the CA 2441 RT and CA 2441 T antenna amplifiers.
• Size of the room: up to 400 m
2
(20 x 20)
• Number of participants: 30 - 100
• Antenna position: The antennae should be placed as high as possible above the table in a position close to the participants.
• Alignment: Place the antennae so that they point to the participants (the convex side must point to the front).
We recommend using the CA 2441 antenna amplifier if the cable attenuation exceeds 12 or 15 dB, i.e. if the CA 2420 cable is longer than
40 m or if the CA 2430 cable is longer than 60 m.
Cable attenuation of different cables in 2.4 GHz applications
Cable type
Cable length 100 m 50 m 30 m
RG 58 100 dB 50 dB 30 dB not suitable
RG 213 U 49 dB 24 dB 15 dB short cable
Aircell 7, CA 2420 41 dB 20 dB 12 dB normal cable
Ecoflex 10, CA 2430 24 dB 12 dB 7 dB long cable
Aircell 7
Standard
CA 2420
Ecoflex 10
Low Attenuation
CA 2430
Max. cable length max. 20 m
= 1 x CA 2422
or 2 x CA 2421
max. 40 m
Min. bending radius 25 mm 40 mm
ATTENTION:
• The CA 2441 RT and CA 2441 T antenna amplifiers may only be powered with 5 V DC.
• When you connect a CA 2441 RT to the TX output of the MCW-D 50 you should use a connecting cable with an
attenuation of at least 10 dB.
8
8
Important Note:
To comply with FCC RF exposure compliance requirements, the following antenna installation and device-operating configuration must be
satisfied. Only authorized and certified beyerdynamic systems integrators may perform the installation of antennae.
There are no user serviceable parts or processes. Connect the receiving antennae to the antenna inputs A and B. Connect the transmitting
antenna to the appropriate output. To maintain compliance with the FCC’s RF exposure guidelines, this transmitter and its antenna must
maintain a separation distance of at least 20 centimetres from all persons.
20
20
**In the USA the use of the CA 2441 RT/T antenna amplifier is prohibited. In Japan the transmitting antenna must not be used
with an antenna amplifier.