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3.4.
–
SOLUTION TO INTERFERENCE ON THE POWER SUPPLY.
IF IN DOUBT CONTACT A LOCAL QUALIFIED MARINE ELECTRICAL ENGINEER BEFORE
PROCEEDING. For each device interfering with DGPS reception, put a 2 or 3 microfarad
suppression capacitor from the positive connection to the metal case of the device causing the
problem. Note: It may be necessary to put additional capacitors between positive and negative
and from negative to the case, which must be earthed (grounded)
N.B.: For engines equipped with alternators it is necessary to wire the 3 capacitors as shown in
the following diagram:
In difficult cases an isolated battery power supply may be the only solution.
3.5.
–
SOLUTION OF INTERFERENCE BY R
ADIATION
For every device interfering with the FX412, check the earth bonding of the device to the ships
ground connection.
If the engine is the source of interference, the construction of a low resistance, fine mesh cage
inside the engine compartment, bonded to the engine block should be considered. (Faraday
cage principle)
Try various sites for the antenna of the FX412.
3.6.
–
SOLUTION TO MECHANICAL INTERFERENCE
If the interference is caused only when the propeller is engaged in gear, it may be necessary to
earth (ground) the propeller shaft, utilising a set of shaft brushes.
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