Maintenance Guide
Cobham Wireless
idDAS Installation and Maintenance Guide 00109GU Rev. 2.0
Page | 37
3.8 EMV Protection
CAUTION!
Protect all coaxial cables and power cables from the transients caused by lightning.
If insufficient Electromagnetic Protection is provided, or if EMV measures are not taken,
warranties issued by Cobham Wireless are not valid.
PRUDENCE!
Protégez tous les câbles coaxiaux et les câbles d'alimentation des transitoires causés par la
foudre.
Si insuffisante protection électromagnétique est fourni ,
ou si des mesures ne sont pas prises
EMV , les garanties émises par Cobham sans fil ne sont pas valides.
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 2 ms. The damage caused depends on the energy involved and on the sensitivity of the electronics
systems.
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.
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 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 d
eclining threshold voltages to help
attenuate the pulse component which makes it
through the first layer of protection.
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
.
A
protective device is also required on the power
supply cord.
Figure
3-4
: Protective device installed in connection
with the power supply