Cooper Bussmann
NOTE:
1.Cooper Bussmann recommends using the
2.To use a repeater unit, the
Installing and Earthing Antennas
You must connect an antenna to each
Cooper Bussmann recommends carefully taping the connections between the antenna and coaxial cable to prevent moisture ingress. Moisture ingress in the coaxial cable is a common cause of radio system problem as it greatly increases the radio losses.
Cooper Bussmann recommends taping the connection with three layers of tape:
Layer Tape
1PVC tape.
2Vulcanizing tape (e.g. 3M 23 tape).
3Additional layer of PVC
The first tape layer lets you easily inspect the joint if required as you can easily remove the Vulcanizing seal.
Note: You must effectively earth all masts for
If the antenna is not already shielded from lightning strike by an adjacent earthed structure, you can provide shielding by installing a lightning rod above the antenna.
You should connect the antenna to the module using 50 ohm coaxial cable (e.g. RG58 or RG213) terminated with a male coaxial connector, The higher the antenna is mounted, the greater the transmission range; however as the length of coaxial cable increases so do cable losses. For use on unlicensed frequency channels, there are several types of antenna suitable for use.
If you mount antennas on elevated masts, you should effectively earth the masts to avoid lightening surges. The
Note: For high lightening risk areas, Cooper Bussmann recommends additional surge suppression devices. If the antenna is not already shielded from lightening strike by an adjacent earthed structure, you can install a lightening rod to provide shielding.
Omni-directional Antennas
This section contains important information for using dipole and collinear antennas. For more information, see the next sections.
Dipole Antennas
Unity gain dipole antennas are commonly used on unlicensed channels. The dipole antenna does not provide any gain, so the power transmitted from the antenna is the same as the power out of the module.
A dipole antenna that comes supplied with integral 15 ft cable does not require additional coaxial cable.
You should mount dipole antennas vertically, preferably no less than 1 metre away from a wall or mast for maximum performance.
Collinear Antennas
Collinear antennas transmit the same amount of radio power in all directions horizontally, and are easy to install and use. They provide gain by compressing the radiated signal to a flattened disc shape, and reducing the amount of signal radiated above and below the horizontal plane.
Collinear antennas are generally used at a central site with more than one remote site, or at a repeater site.
Collinear antennas are similar in appearance to dipole antennas; however the antenna is longer.
Collinear antennas are supplied without cable, and require additional coaxial cable.
You can use collinear antennas to:
•Transmitter – to compensate for the losses in long lengths of coaxial cable.
•Receiver – to increase receive sensitivity.
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