T-GPS User Manual Version 1.2 | 33
Another important consideration is safety; a lightning protection device (not supplied) should be
mounted in close proximity to, and above, the antenna to prevent damage being caused by a
lightning strike.
As further protection, a surge protective device (SPD) is connected in series with the antenna
cable is provided (see below):
The SPD should be mounted directly on to the copper ground bar of the cabinet. If this is impossible,
use the short yellow-green cable provided.
The antenna cable is connected to the SPD; the output of the SPD is connected to the Signal Input
(Antenna) module using the additional cable, 3 m long. Do not shorten this cable!
The length of the antenna cable should be specified at order. The cable has a BNC connector.
NOTE: the surge arrester attenuates the antenna signal, especially if the cable is long. If
synchronisation problems occur, remove the arrester, and directly connect the antenna to the
module. After synchronisation, insert the arrester, the synchronisation should then be
established quickly (less than one minute).
Figure 6.7 Surge protective device
