JRC JLN-900 Installation And Instruction Manual page 148

Do not use twisted quads or ordinary multi-pole cable, which also has somewhat twisted parts.
In a twisted quad the signals in one pair will cross-couple to the other pair, because they are so
close, and because one pair has no means of protecting itself from the other pair. In an ordinary
multi-pole cable, the noise-cancelling properties are random or unknown i.e. cross-coupling
between the individual wires is bound to occur.
EMI
Electromagnetic Interference (EMI) is everywhere. It is the unwanted signal component that
disrupts a system, creates unwanted noise in the audio channels, or causes the system to go
down at irregular intervals. If EMI is not counter-acted at installation time, it will be very costly
to troubleshoot and change the system later. Intermittent faults with an EMI background can be
impossible to find.
The Speed-log units has been designed and tested with EMI protection in mind, but defective
wiring may destroy that protection.
Termination of Signal Cables
To reduce the risk of
EMI induction
Excessive noise on audio channels
Short circuits
Intermittent faults
Entanglement
Mix-ups
and to ease re-dressing of cabling and re-connections after service
All signal cables must be connected carefully and by using described method depending
on type of connection block terminal.
1. Where the connection block terminals are of press-type we recommend to use bare
wires
2. Where the connection block terminals are of screw-type we recommend to press
end-caps on the bare wire ends as described below
Same principles can be used on power cables.
The free ends should be as short as possible. This tends to make connecting more difficult, but
greatly reduces the risk of EMI induction.
The end caps must be crimped with the proper tool to attain a proper connection. Never use
pliers or crimp-tools intended for anything else than end caps.
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