MBF-40 SMR700/SMR800 PS REPEATER
PRODUCT DESCRIPTION AND USER’S MANUAL
www.cobham.com/wireless Date: 28-Jan-16 Cobham Wireless – Coverage
Page | 12
Rev. 2.1 Doc. No. 00046UM
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
10kA and may last longer than 2ms. 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.
Figure 2-1: Example of EMV protection for a repeater system
For detailed information please refer to IEC 61024-1 and 61312-1 for international standards for
protection of information systems against LEMP (Lightning Electromagnetic Pulse), including radio
transmitters. They define proper planning, installation and inspection of effective lightning protection
systems.
Cobham Wireless repeaters comply with the EN standard ETS 301 498-8 which stipulates demands
on lightning/surge protection for typical infrastructure telecom equipment installations.
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.
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