Electrical Installation; Lightning Protection - Hitachi 670 Series Installation Manual

Section 6
Connecting
Always position the antenna and its console so that a continuous clear line-of-sight visibility to all
directions is obtained, preferably more than 75%. A minimum of 50% clear line-of-sight visibility is
required for un-interrupted operation.
IEC99001046 V1 EN-US
Figure 48:
6.5.2

Electrical installation

Use a 50 ohm coaxial cable with a male TNC connector on the antenna end and a male SMA connector
on the receiver end to connect the antenna to the IED. Choose cable type and length so that the total
attenuation is max. 26 dB at 1.6 GHz. A suitable antenna cable is supplied with the antenna.
The antenna has a female TNC connector to the antenna cable. For location of GPS time module (GTM),
refer to section
6.5.3

Lightning protection

The antenna should be mounted with adequate lightning protection, that is the antenna mast must not
rise above a neighboring lightning conductor.
74
Antenna line-of-sight
"Rear side connectors". Connection diagram for GTM is shown in figure 19.
Make sure that the antenna cable is not charged when connected to the antenna or to the
receiver. Short-circuit the end of the antenna cable with some metal device, then connect to
the antenna. When the antenna is connected to the cable, connect the cable to the receiver.
The IED must be switched off when the antenna cable is connected.
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670 series
Installation manual