Specifications

61
Table below allows comparison between the 3 technologies of
RF coaxial surge protectors, in order to select the right solution
regarding the application and the requirements.
Installation
The efficiency of coaxial protectors is highly dependent on
proper installation, in particular their connection to the
earthing network of the installation.
The following installations rules must be strictly observed to
insure the efficiency :
Equipotential bonding network : all the bonding conductors
of the installation must be interconnected and connected to
the installation earthing network.
Optimized connection of the protector to the bonding
network : to reduce the residual voltages during lightning
discharge currents, the connection of the protector to the
bonding network must be as short as possible (less than
50 cm) and has a proper cross section (at least 4 mm
2
).
The
<< feedthrough mounting >> versions meet perfectly all
these requirements.
Warning : for good contact, remove carefully all paintings
or insulating coatings.
Location of the protectors : they should preferably be
placed at the entrance of the installation (to limit the
penetration of lightning currents) and also near sensitive
equipment (to enhance protection).
2 types of mounting
Feedthrough mounting
Direct mounting of the surge protector on the grounded frame
at the installation entrance :
- perfect connection to the bonding network
- best location (conduction of the surge currents at the
entrance of the installation)
- good mechanical withstand.
Alternative mounting
- connection to the bonding network by wire (4 mm
2
minimum
and shortest length possible).
Technology Gas tube DC Block Quarter wave
from 70V to 600 V in relation with
the dV/dt, then arc regime (short-
circuit of the line in the full
bandwidth). RF signal disturbed
during the protection operation.
< 100 V
Short-circuit of the line in the full
bandwidth : RF signal disturbed
during the protection operation.
< 20 V
RF signal not disturbed during
the protection operation.
DC to 3GHz (dependent of the coaxial
connector and of the impedance)
125-1000 MHz Narrox band (GSM, DCS1800, PCS,
DECT, GPS) Wide band (e.i. 1,3 - 2,8 GHz)
CITEL series P8AX CXP-DCB PRC
Principle Sparkover Sparkover + Filtering Adapted short-circuit/selective band filter
Residual voltage
Bandwidth
DC injection Compatible Not compatible Not compatible
8/20
㎲
discharge 10 kA 10 kA Fonction de la connectique : 100
current capability kA pour le 7/16, 50 kA pour le N
Life expectancy Linked to the GDT stress Linked to the GDT stress Illimited
Connectors N, BNC, TNC, UHF, SMA, 7/16 N, BNC, TNC, F 7/16, N, TNC....