MBF-40 SMR900 PS REPEATER
PRODUCT DESCRIPTION AND USER’S MANUAL
Cobham Wireless
–
Coverage
Date: 31-May-18
www.cobham.com/wireless
Doc. No. 00141UM
Rev. 1.0
Page |
10
2.2.5 EMV Protection
CAUTION! Ensure good EMV protection. If insufficient Electromagnetic Protection is provided, or if
EMV measures are not taken, warranties issued by Cobham Wireless are not valid.
Connect the lightning protection
The lightning hazard to electric and electronic equipment consists in the interferences of direct lightning
current infections and high surge voltages induced by the electromagnetic field of nearby lightning channels
or down conductors. Amplitudes from cloud-to-earth lightning amounts to several 10 kA and may last longer
than 2 ms. The damage caused depends on the energy involved and on the sensitivity of the electronics
systems.
Ensure that lightning protection measures are taken to
create a reliable repeater site. Protect all coaxial cables and
power cables from the transients caused by lightning. Fit all
cables with suitable lightning protection devices.
The primary protective device is part of the site installation
and is not supplied by Cobham Wireless. Coaxial lightning
protection is normally one of these three types: gas capsule,
high-pass and Bandpass.
There also need to be a protective device installed on the
power supply cord.
Several lightning protection devices should be used in series
with declining threshold voltages to help attenuate the pulse
component which makes it through the first layer of
protection.
Figure 2-1. Protective Device Installed in
Connection with the Power Supply
Figure 2-2. Example of EMV protection for a repeater system
Repeater
Fiber
BTS
-30dB
Coupler
OMU
Antenna
Primary
Protective
Device
Equipotential
Grounding Bar
230VAC/
-48VDC
Protective
Device
The top of
the mast
must be
higher than
the antennas
and be
grounded
properly
The
grounding
path must
have reliable
continuity
and be
dimensioned
correctly
BTS area
Repeater area
Summary of Contents for MBF-40 Americas
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