Product Manual

© MiMOMax Wireless Ltd
Tornado Product Manual
49
The technique recommended to protect the radio unit, antenna, feeder and tower uses earthing kits in strategic places. The
key points are: adjacent to the feeder connector at the antenna, where the feeder leaves the base of the tower and where the
feeder enters the building structure. If earthing kits supplies are limited or connection to an earth point is difficult, then order
of importance of the earthing locations is as follows:
(a) For a top mounted antenna acting for lightning protection:
1. At antenna connection point.
2. At the tower base.
3. At the entry to the building.
(b) For a general mounting of antenna:
1. At the entry to the building.
2. At the tower base.
3. At the antenna connector.
Earthing kit
Earthing kits
1/2" heliax cable
Polyphase
discharge
unit
Coax to
cabinet
45º cone of
protection
Lightning protection
A gas discharge unit is required to release high voltage charges developed between the cable inner and outer. There are two
types available, a transmitting and a receiving variant. The transmitting variant is the larger. It is very important that these
variants are not confused because the lower discharge potential rating for the receiver unit will be triggered by transmitting
voltages. This will cause a high VSWR and poor performance.