BFW
Installation Guide
AN-30e & AN-50e Systems
cable shield and center conductor can be directed safely to ground by using a
lightning arrestor in series with the IF cable.
3.4.1 System
Grounding
Procedures
The following practices are recommended for the AN-30e/AN-50e system to
prevent equipment damage due to a lightning strike:
Grounding the ODU
All grounding connections must be made in accordance with local and national
standards. Painted or dirty surfaces should be cleaned thoroughly down to bare
metal and screws should be well tightened.
Provide a direct ground connection from the antenna-mounting bracket, the
lightning protectors, and the AN-30e/AN-50e ODU system to the same ground
point on the tower. Use the grounding screw on the antenna bracket and the
grounding screw on the ODU to terminate the ground wires. Avoid sharp bends in
the ground wire.
Bonding the Co-Axial Shield
The co-axial shield should be connected to the tower ground strip at the base of the
tower and every 100 feet along its path up the tower to the radio
.
The co-axial
shield should be bonded to the building ground at the point of entry to the
building. Grounding kits should be used for the bonding the co-axial shield to the
ground point.
Only the shield of the IF cable should be bonded to the grounding points. There is
DC current flowing in the center conductor and any connection to the center
conductor will interfere with the DC current and cause equipment malfunction.
Install IF Lightning Arrestors
Install two IF lightning arrestors in series with the IF cable.
The first IF lightning arrestor at the outdoor unit should be mounted on the antenna
mounting bracket. The equipment side of the lightning arrestor is connected to the
IF port on the outdoor unit using as small jumper cable. The surge side of the
lightning arrestor terminates the IF cable coming from indoor unit.
The second IF lightning arrestor should be installed at the point of entry to the
building. Terminate the IF cable coming from the tower to the surge side of the
arrestor, and terminate the IF cable coming from AN-30e/AN-50e indoor terminal
to the equipment side of the arrestor. Connect the ground terminal on the lightning
protector to the nearest building ground. If the grounding point is not near to the
building the lightning arrestor can be connected at the back of the AN-30e/AN-50e
indoor terminal equipment and grounded to the nearest building ground point. The
tower ground and the building ground should be connected together.
70-00042-01-02
Proprietary Redline Communications © 2005
August
2005
Page 22 of 34
