User's Manual

Chapter 5 - Main Antenna Feeder System Installation
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Lightning Arrester
Use lightning arrester to protect cable against lightning.
There are two types of common lightning arresters:
 λ/4 stub lightning arrester
Figure 36 shows λ/4 stubs, it is a tri-port passive coaxial component.
Length of each third port is one quarter of wavelength and its external
and internal conductors are short-circuited. Its working principle is
similar to that of band pass filter.
F IGURE 36 - λ /4 S TUB LIGHTNING A RRESTER
 Graviton lightning arrester
Graviton is a short-circuited protection part encapsulated in ceramics
or glass and filled with low-pressure inert gas. Figure 37 shows two
types of graviton lightning arresters: three electrode on left and dual
electrode graviton on right side.
F IGURE 37 - GRAVITON LIGHTNING ARRESTERS
The basic working principle of the graviton is gas discharge. Do not
use graviton in case of excessive currents more 10 kA. Usually, a
graviton has a life of 5 years.