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User Manual
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".
2.2
The XYR301-E module can be powered from a 9 - 30VDC power supply. The power supply should be rated at 1 Amp
minimum. The positive side of the supply must not be connected to earth. The supply negative is connected to the unit
case internally. The DC supply may be a floating supply or negatively grounded.
The power requirements of the XYR301-E unit are shown in the following table
Quiescent
TX @100mW
TX @ 400mW
A Ground Terminal is provided on the back of the module. This Terminal should be connected to the Main Ground
point of the installation in order to provide efficient surge protection for the module (refer to the Installation Diagram)
9 - 30
VDC
34-XY-25-41
XYR301-E
12VDC
300mA
370mA
410mA
B
A
_
-
+
+
COM
DIO
24VDC
160mA
190mA
210mA
RS485
SUPPLY
MODEM
XYR301E Wireless Ethernet
o
45
Directional
Antenna
Power Supply
Page 23
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