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Cooper Bussmann BU-905U-L Wireless I/O Installation Manual
Yagi Directional Antennas
Yagi antennas are directional and have positive gain to the front of the antenna and negative gain in other directions. You can use the gain to:
• Compensate for coaxial cable loss for transmitter unit; and
• Increase receive sensitivity for receiver units.
You should install Yagi antennas with the central beam horizontal and pointed directly in the transmission direction to benefit from the
antenna gain.
Note: Yagi antennas usually have a drain hole on the folded element. You should position the drain hole at the bottom when
installing the antenna.
You can install Yagi antennas:
• Vertically polarized – with the elements in a vertical plane; or
• Horizontally polarized – with the elements in a horizontal plane.
The following table shows the recommended installation mode for different situations.
If your installation has … Cooper Bussmann recommends using …
Two stations both using Yagi antennas • Horizontal polarization for the stations.
Two or more stations communicating • Vertical polarization for the stations; and
with a common station • Omni-directional (i.e., non-directional) antenna for the central station.
The following diagram shows the recommended installation for Yagi directional antennas.
133A1580Rev1.6