Instructions 2098A
Phoenix Contact Inc. • P.O. Box 4100 • Harrisburg, PA 17111 • Phone: (717) 944-1300 • FAX: (717) 944-1625
1
For wireless data, signal and mobile
phone system protection
Installation Instructions 2098A
June 2005
COAXTRAB Surge Voltage
Protection Adapter CN-UB-280DC
1.
Introduction
The Phoenix Contact COAXTRAB CN-UB-280DC
(see Figure 1) is a gas-filled surge protection device
designed to protect wireless radio and module phone
base stations from surge voltages caused by lightning
or other electrical sources that are induced onto an-
tenna cables.
The CN-UB-280DC is available in two configurations;
one with N-type male/female connectors and the other
with N-type female/female connectors.
The CN-UB-280DC features a gas-filled discharge ar-
rester between the inner and outer conductor. See
Figure 2.
Gas Arrester Tube
Access Hole
Gas Arrester Tube
PN 2818203
Threaded Cap
COAXTRAB Surge
Voltage Protection
Adapter
2098A015
Figure 3. CN-UB-280DC Gas Discharge Arrester
20 kA
Gas
Discharge
Arrester
N-type
Socket
N-type
Socket
Shield/Housing
Earth Ground
Connection
2098A008
Figure 2. CN-UB-280DC Schematic Diagram
The gas discharge tube can be replaced in the event
that a direct lightning strike causes a failure. See
Figure 3.
The CN-UB-280DC has a separate ground terminal for
installations where nonmetallic enclosures are used or
where a reliable grounding surface is not present.
See Figure 4.
CAUTION
Always keep the ground wire as short as
possible and, when possible, make all
ground connections to a single common
point. Without a single-point ground system,
lightning becomes a critical concern for base
stations. The single-point ground insures
that no ground loops are created.
2098A003
Female N-type
Connection
Male N-type
Connection
CN-UB-280DC-SB
PN 28 18 14 8
CN-UB-280DC-BB
PN 28 18 85 0
Female N-type
Connection
Female N-type
Connection
Figure 1. CN-UB-280DC Configurations
Figure 4. CN-UB-280DC Ground Connection
M3 Grounding
Screw
2098A017
COAXTRAB Surge
Voltage Protection
Adapter
INSPIRING INNOVATIONS
