Yagi CWSI CP3000 User manual

CWSI YAGI ANTENNA INSTALLATION GUIDE
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1Introduction
This document details the typical use and installation of a directional Yagi Antenna with a CWSI CP3000
System. Yagi antennas are highly directional antennas that are typically used to provide long distance
reception and re-transmission of signals to outlying facilities that are quite far away. Typical distances
for properly aligned (vertical ) Yagi to Yagi antennas is from 3000 to 3500 feet and sometimes farther,
although these distances can vary depending upon your local installation and local conditions.
This document is provided as a guide to help determine whether a Yagi antenna may be called for and if
so the best use and location for the Yagi antennas. Our field testing has found that the yagi antennas are
best suited for unobstructed line of sight reception and transmission. When utilized in dense clustered
applications the reception radius on the sides of the antenna have not fared as well as omni antenna
reception. The following information should help you in planning your installation, but does not
eliminate the need for an on-site RF survey, which should always be performed to help ensure the best
installation prior to system installation.
2When to Consider Using Yagi Antennas
The use of a Yagi Antenna or matching Yagi Antennas should be considered when you have at least one
building that is farther than a typical Omni repeater to repeater installation can handle, which is typically
about 1100 feet when there is a clear unobstructed line of sight. The other case would be when you
have a large installation and you would like to have one direct link from the farthest point out to help
reduce the number of repeaters that the data would flow through.
3System Data Flow
The CWSI system is designed as a mesh-network that forwards data from Repeater to Repeater in such a
manner to forward data to the CP3000 main panel. If a repeater goes down the network will
automatically reroute data to other repeaters to forward data to the CP3000 provided you have
performed the signal survey to assure redundant links.
3.1 Repeater Basics
All wireless devices (smoke detectors, transmitters, manual stations) are considered slaves. Slaves
transmit their data to the local master antenna where it is acknowledged by that same master antenna.
This slave to master RF link is bi-directional. The data is then forwarded from that repeaters Slave
antenna to the next Master antenna in the chain up to the CP3000 main panel which only has a Master
Antenna.
Data flow is from slave to master.
The previous standard antennas that came with a CP 3000 or an AR-3 repeater were Omni-
directional (Omni) antennas. They receive and transmit equally in a 360 degree pattern.

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The antenna on the LEFT side of the repeater is the MASTER. The antenna on the RIGHT side of
the repeater is the SLAVE.
The CP 3000 has an antenna on the MASTER side only
SLAVES ALWAYS TALK TO MASTERS. Therefore, all transmitters report to the left side (master) of the
repeater. The repeater then transmits the data through the right side (slave) to the left side (master) of
the next repeater that it talks to.

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4Antenna Characteristics
The Yagi Antenna has a very narrow and highly directional radiation pattern. The majority of the RF
energy is focused to come out the front end of the antenna, i.e. where you point the antenna is where
90% of the RF signal is transmitted. The radiated pattern of a Yagi antenna can be considered a straight
line with a very narrow corridor running its length that may be able to be tapped into depending upon
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the antenna type, the distance from the source Yagi antenna and the off-access angle of the "tapping"
antenna.
The back of the antenna is where the cable connector is located, the front is the opposite end furthest
away from the cable connector. Properly mounted the tines are aligned vertically in the same
orientation as the Omni Antennas on the Repeaters and the CP3000.
The following drawing shows the Ideal radiation patterns of a Yagi to Yagi antenna. These results were
determined during RF field measurements.
Note- All readings are subject to ideal testing conditions using Yagi antennas mounted at 8 to 15 feet
above ground and aligned for survey testing. Distances experienced by installers in the field are subject
to local conditions and variations in building construction. These distances are to be used as a guideline
and are subject to a final site survey for confirmation.
5Sample Installations
ANTENNA PLACEMENT

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There are two basic ways of designing a system. If you have multiple buildings in an area and want the
signals from the wireless devices to report to the CP-3000, you may have antennas on the SLAVE side of
the repeaters in the field pointing towards the CP-3000 or the repeater above the CP 3000. The master
side of the repeaters will gather signals from the slave transmitters in the field and the slave side will
transmit those signals in a narrow direction towards the master side of the next repeater or the CP-
3000.
You can have an antenna on the CP-3000. Since the CP-3000 is a master only, that antenna will be in a
receiving or gathering mode.
The second design is a bit different. If you have a long distance application, such as multiple buildings on
an industrial site, you can have antennas on both sides of the repeater, the master side gathering signals
and the slave side transmitting to the next repeater master or the CP-3000 master.
The Yagi antenna will always be mounted with the main body of the antenna parallel to the ground
pointing in the direction you want to receive or transmit signals. The spines will always be in a vertical
position pointing up and down as depicted in the picture below.
6Summary

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Yagi Antenna’s offer the installer a design choice and as mentioned are more suitable for long distance
applications. The cost of the Yagi is considerably more than an Omni antenna however in the proper
application a Yagi repeater may accomplish what it would take three Omni repeaters to do, as such
making the total installation more cost effective. The key is the signal survey and keep in mind the mesh
technology. Create redundant links to assure `multiple signaling paths.