Toshiba HHGP1 - Manual (Page 17)

 15 
6 F 2 S 0 7 3 8
6.4 Installing Surge Arrester
The GPS antenna must be installed outdoors, so a surge arrestor is required as a measure against
induced surges due to lightening. (This is not effective against a direct lightening strike.)
The arrestor should be installed at the point where the coaxial cable from the antenna enters the
building. A recommended arrestor is CA-23RS made by Daiichi Denpa Kogyo. The
specifications for and the appearance diagram of the arrestor are described in Appendix C. The
surge arrestor is not water-proof and should be installed in a box. Connect the coaxial cable to the
arrestor by an N-type connector.
Stitch or solder a copper earth wire, 2.5 to 3.2 mm in diameter, to the earthing terminal on the
arrestor. Connect the other end of the wire to the arrestor’s own earthing point. Make the
connection distance between the arrester and the earthing point as short as possible and protect
the earth cable with an insulation pipe.
The surge arrestor must have its own direct connection to earth and must not share an earth
connection with other equipment. Failure to comply with this requirement will result in risk of
electric shock at time of lightening strike.
6.5 Installing Fibre Optics
For the fibre optic connection, multi-mode GI fibre (62.5/125 µm) is used. When laying fibre
optic lines, ensure a minimum curvature radius of 50 mm.
CAUTION
Do not bend the fibre optic cable sharply, as this may damage it and may cause malfunctions.
Ensure that fibre optic connectors are fixed securely.