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SURGE
ARRESTOR
(OPTIONAL)
TX/RX
XYR
400E
GND
INSTALL AERIAL ABOVE
LOCAL OBSTRUCTIONS
2.2.2 Directional antennas.
Directional antennas can be
a Yagi antenna with a main beam and orthogonal elements, or
a directional radome, which is cylindrical in shape, or
a parabolic antenna.
A directional antenna provides high gain in the forward direction, but lower
gain in other directions. This may be used to compensate for coaxial cable
loss for installations with marginal radio path.
Yagi antennas should be installed with the main beam horizontal, pointing
in the forward direction. If the Yagi is transmitting to a vertically mounted
omni-directional antenna, then the Yagi elements should be vertical. If the Yagi is
transmitting to another Yagi, then the elements at each end of the wireless link need to
in the same plane (horizontal or vertical).
Directional radomes should be installed with the central beam horizontal and must be
pointed exactly in the direction of transmission to benefit from the gain of the
antenna. Parabolic antennas should be mounted as per the manufacturer's
instructions, with the parabolic grid at the "back" and the radiating element pointing
in the direction of the transmission.
Ensure that the antenna mounting bracket is well connected to "ground/earth".
15
WEATHE RPROOF
CONNECTORS WITH
"3M 23" TAPE
COAXIAL CABLE
PROVIDE GOOD
GROUND
CONNECTION TO
MAST, MODULE
AND SURGE
ARRESTOR
XYR400E Ethernet Modem
30 cm minimum
COLINEAR
ANTENNA
STRESS RELIEF
LOOP
MAST
EARTH STAKE
IF GROUND
CONDITIONS ARE
POOR, INSTALL
MORE THAN ONE
STAKE
o
45
DIRECTIONAL
ANTENNA
Version 1
5/1/08
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