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OmniSTAR 5220HP User Manual
Issue 1.32 12/2010
14
Counter Electromagnetic Force (CEMF)
A potential problem inherent in any installation of electronic systems within a
vehicle is Counter Electro-Magnetic Force (CEMF).
CEMF is caused when relays or solenoids, connected to the vehicle DC power
distribution, are de-energised. The voltage produced may exceed 400 volts.
CEMF is produced by equipment such as the following:
•
Electric fan brakes
•
Air conditioners
•
Starter relays
•
Electric pump relays
CEMF is more than sufficient to damage or cause erratic operation of any
electronic system that is also connected to the same vehicle DC power supply.
CEMF can be eliminated by installing diodes at the relays and solenoids that
cause the problem, and more importantly at the power supply cable
connections on the receiver.
Cable Installation
Cables must be correctly installed for optimum system operation. Therefore,
the following should be noted:
•
Do not route an L-Band receiver remote antenna cable with the cabling of
any other radio system. This may cause interference between both
systems.
•
If at all possible, do not run L-Band receiver antenna cables parallel to
other radio system cabling closer than 30 centimetres.
•
If cables must cross, ensure that they cross at an angle of 90°. This
minimises the possibility of interference.
•
As far as is practicable, ensure that cables and I/O connectors are unique
and fit only in their allocated location.
•
Avoid routing cables along-side power generator cabling and other high
electrical noise sources. This can cause interference.
Содержание 5220HP
Страница 1: ...OmniSTAR 5220HP User Manual Issue 1 32 Dec 2010...
Страница 12: ...OmniSTAR 5220HP User Manual Issue 1 32 12 2010 12 Figure 3 Drawing Ant Aero 06 antenna...
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Страница 83: ...OmniSTAR 5220HP User Manual Issue 1 32 12 2010 83 User Notes...