Dipole And Collinear Antennas - Weidmuller WI-GTWY-9 User Manual

WI-GTWY-9-xxx Wireless Gateway
For information on antennas and cables for the WI-GTWY-1 licensed products, please refer to
Weidmuller, Inc. or an authorized distributor.
Connections between the antenna and coaxial cable should be carefully taped to prevent ingress
of moisture. Moisture ingress in the coaxial cable is a common cause for problems with radio
systems, as it greatly increases the radio losses. We recommend that the connection be taped,
firstly with a layer of PVC Tape, then with a vulcanizing tape such as "3M 23 tape", and finally
with another layer of PVC UV Stabilized insulating tape. The first layer of tape allows the joint
to be easily inspected when trouble shooting as the vulcanizing seal can be easily removed.
Where antennas are mounted on elevated masts, the masts should be effectively earthed to avoid
lightning surges. For high lightning risk areas, surge suppression devices between the module
and the antenna are recommended. If the antenna is not already shielded from lightning strike by
an adjacent earthed structure, a lightning rod should be installed above the antenna to provide
shielding.

3.2.1 Dipole and Collinear antennas.

SURGE
ARRESTOR
(OPTIONAL)
GND
INSTALL AERIAL ABOVE
LOCAL OBSTRUCTIONS
A collinear antenna transmits the same amount of radio power in all directions - it is easy to
install and use. The dipole antenna with integral 15 ft (5m) cable does not require any additional
coaxial cable, however the other collinear antennas do not have integral cable and an external
cable length must be connected - such as the WI-CCSMA-N-33 or WI-CCSMA-N-66 cable kits..
WEATHERPROOF
CONNECTORS WITH
"3M 23" TAPE
COAXIAL CABLE
ANT
PROVIDE GOOD
GROUND
CONNECTION TO
MAST, MODULE
AND SURGE
ARRESTOR
1m minimum
for best performance
COLINEAR
ANTENNA
STRESS RELIEF LOOP
MAST
EARTH STAKE
IF GROUND CONDITIONS ARE
POOR, INSTALL MORE THAN
ONE STAKE
V1.18
31