Specifications

FCS1362 Page 37 of 74 © Nov 2010
particularly at frequencies above 400MHz. It may be more effective to find a different location for the
antenna to achieve a shorter cable run.
4.2.5.1. Routing of the antenna cable
Ensure that the cable is:
• properly secured but ensure that the cable is not strained or distorted, by excessive tightening of
cable ties for example
• routed in such a way as to avoid sharp bends
• not run in parallel with vehicle wiring wherever possible
• routed as far away as possible from any electronic module
Ensure that any trim panels do not trap, crush or distort the cable when vehicle trim is replaced.
Additional care should be taken when installing a glass mount antenna to the rear screen of a hatchback
type vehicle to allow the boot to open but to prevent damage to the cable over a period of time. This may
be achieved by providing a loop of cable across the boot opening.
Special care should be taken when routing coaxial cable used with a high power radio system (see
section 2.3.1.1) due to the much higher risk of causing RF interference to the vehicle’s electronics.
4.2.5.2. Fitting of coaxial connectors
Fit the correct antenna connectors at each end of the coaxial cable. Crimp type connectors are preferred
and should be fitted using the correct ratchet tool. Ensure that all joints are both electrically and
mechanically sound and, if exposed to harsh environmental conditions, sealed to prevent ingress of dirt
and water.
4.3. Installation of cables
Installation must follow the safety guidance in section 2.
See section 2.6.1.4 for joining cables etc.
Do not attach any wire or cable to the vehicle fuel system and pipes or use a common hole through a
bulkhead.
4.3.1. Routing of power and control cables
For guidance on cable runs refer to vehicle manufacturers instructions where available, or, if not available,
seek expert advice and specification from client or customer.
Where possible all cables should pass under carpets and through trim or mouldings in such a way as to
ensure that any panels do not trap, crush or distort the cable when refitted. Use sleeving or cable
protection and cable ties where required.
Cables should be securely affixed so as not to distract the driver when the vehicle is moving. Similarly
adequate securing can avoid future failure due to fatigue from vibration.
Care should be taken to avoid strain on any cabling likely to cause broken connections.
Ensure that excess length of any cable tie used is cut flush with its locking mechanism to avoid leaving
sharp and potentially dangerous projections.
See section 4.2.5 if dealing with antenna cable.
4.3.1.1. Grommets
Whenever the cables pass through a bulkhead, a grommet must be fitted. It is always better to use an
existing hole rather than drilling another, provided it is in the right position, is large enough, and is fitted
with a grommet. The quality of the original seal should not be impaired.