5-26 SPECIAL INSTRUCTIONS FOR ELECTRONIC SUBSYSTEMS E UROCARGO Euro 4/5 The connection and positioning of the cables that involve the installations must be done taking care to: - use a good quality antenna cable, particularly for the effects of visual coverage of the protective screen; - for the aforesaid cable make a route that has a suitable distance (min.
50 mm) from the pre-existing wiring, saving the minimum distance from the metal structure of the cab, taking care that the cable is not too taut and preventing the cable getting folded and crushed; application is preferable on the left or right side; - never shorten or lengthen the coaxial antenna cable; - use the existing holes for the cable passage. If necessary and essential make an additional hole; take the precautions to preserve the bodywork (rustproofing, liner, etc..); - assure a good connection with the structure of the vehicle (ground), both of the base of the antenna and of the containers of the appliances, to achieve the maximum transfer of power.
The typical installation positions of equipment are those of the dashboard-gearbox or roof assembly zone - driver side. The electric supply of the appliances, if requiring a different voltage to that of the system, must be obtained via a suitable DC/DC 24-12V converter if not already contemplated. The supply cables must be as short as possible, avoiding any coils (twisting) and ob- serving the minimum distance from the reference surface. Installations of GPS antenna cables and navigation receiving equipment Correct and careful assembly of the GPS antennas on the vehicle is extremely important to accomplish correct operation and obtain top performance.
The antennas must be mounted, preferably, in hidden places, out of sight. The position of the GPS antenna is delicate. The signal levels received from the satellite have very low power (approximately 136 dBm), so that any obstacle for the antenna can affect the quality and performance of the receiver. • The value of the SWR must be as near as possible to unity, the recommended value is 1.5 while the maximum acceptable value must in no case be greater than 2 in the GPS frequency range (1575.42 +1.023 MHz).
• The values of the ANTENNA GAIN must be as high as possible and assure a sufficient characteristic of spatial uniformity, char- acterized by deviations from the mean in the order of 1.5dB in the band 1575.42±1.023 MHz. The GPS antenna must be installed in such a way that it has the greatest possible view of the sky. It is recommended to have 90° as the absolute minimum angle of vision of the sky. This view of the sky must not be obscured by any object or metal structure. The position has to be Horizontal. An ideal location for the GPS antenna is under the plastic dashboard in the centre and at the base of the vehicle’s windscreen.
It must not be installed below any metal that belongs to the cab structure. Position the GPS antenna at a distance of no less than 30 cm from another antenna. The connection and positioning of the cables that involve the installations must be done taking care to: - use a good quality antenna cable, particularly for the effects of visual coverage of the protective screen; - for the aforesaid cable make a route that has a suitable distance (min.
50 mm) from the pre-existing wiring, saving the minimum distance from the metal structure of the cab, taking care that the cable is not too taut and preventing the cable getting folded and crushed; application is preferable on the left or right side; - never shorten or lengthen the coaxial antenna cable; - use the existing holes for the cable passage. If necessary and essential make an additional hole; take the precautions to preserve the bodywork (rustproofing, liner, etc..); - assure a good connection with the structure of the vehicle (ground), both of the base of the antenna and of the containers of the appliances, to achieve the maximum transfer of power.
The installation of navigator appliances must use the supply system already set up on the vehicle, making the connection to ter- minal 30 via an additional fuse. This equipment must be type approved according to the law and be the fixed type (not portable). Install the transmitting part in a flat and dry zone separated from the electronic components of the vehicle sheltered from moisture and vibration. Electrical system: modifications and drawing-off power Base - January 2008 Print 603.93.431