ABB REL670 Installation And Commissioning Manual page 46

Installing the GPS antenna Chapter 5
Installing the IED
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 vis-
ibility is required for un-interrupted operation.
A
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Figure 20: Antenna line-of-sight
6.1.2 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 REx670. 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.
Caution!
Make sure that the antenna cable is not charged when connected to the antenna or to the receiv-
er. Short-circuit the end of the antenna cable with some metal device, then connect to the anten-
na. When the antenna is connected to the cable, connect the cable to the receiver. REx670 must
be switched off when the antenna cable is connected.
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