Chapter 2: System hardware Installing a GPS receiverPage 2-51Installing a GPS receiverTo install a GPS receiver as the timing reference source, use the following procedures: Mounting the GPS receiver on page 2-52 Cabling the GPS Antenna on page 2-53 Installing and connecting the GPS LPU on page 2-53CautionPrior to power-up of equipment, ensure that all cables are connected to the correctinterfaces of the CMM4 unit and the UGPS receiver module. Failure to do so mayresult in damage to the equipment.GPS receiver locationMount the GPS receiver at a location that meets the following requirements: It must be possible to protect the installation as described in Grounding and lightningprotection on page 3-8. It must have an un-interrupted view of at least half of the southern (resp. northern) sky in thenorthern (resp. southern) hemisphere. For a receiver mounted on a wall there must be noother significant obstructions in the view of the sky. It must be mounted at least 1 m (3 ft), preferably 2 m (6 ft), away from other GPS receivingequipment. It must not be sited in the field of radiation of co-located radio communications equipment andshould be positioned at a distance of at least 3 m (10 ft) away.Mount the UGPS receiver on the wall of the equipment building if there is a suitable location onthe wall that can meet these requirements.Mounting the GPS receiver module on the equipment buildingIf mounting the GPS receiver on the equipment building (Figure 39), select a position on the wallthat meets the following requirements: It must be below the roof height of the equipment building or below the height of any roof-mounted equipment (such as air conditioning plant). It must be below the lightning air terminals. It must not project more than 600mm (24 inches) from the wall of the building.If these requirements cannot all be met, then the module must be mounted on a metal tower ormast.
