5
Yagi (Directional) Antenna
The Yagi antenna includes the directional antenna and mounting hardware:
External Antenna Types
The Omni and Yagi antennas transmit and receive with two different radiation patterns.
The Davis long-range omni antenna transmits and receives data in a radiation pattern of
360
°,
the same radiation pattern as a standard Vantage Pro2 dipole antenna. The Yagi
antenna transmits and receives data packets in a 50
°
beam of the front of the Yagi
antenna. The antenna is limited in the angle and direction it can transmit and receive
packets, but it increases the distance between transmitter, repeater, and receiver
proportionally.
All wireless Davis Instruments stations and standard wireless repeaters come equipped
with standard dipole antennas that have an omni-directional radiation pattern.
It is important to remember that each long-range repeater will have two antennas. You
can think of one as the “microphone,” to receive data; and the other as the “speaker” to
transmit data. The two antennas do not have to be the same. It is important to keep in
mind which is the “microphone” and which is the “speaker.”
Yagi Antenna
5/16"
U-Bolts
48"
Antenna
Cable
Flat Washer
Lock Washer
Nut
Boom
Directors
External Antenna Radiation Patterns
(radiation pattern 360 )
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Omni-Direction Antenna
(radiation p/- 25 )
Yagi Antenna
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(Top View)