1.
EMC is the process of predicting and
controlling potential interference in new equipment through design and
their intended working environment without suffering or causing unacceptable
degradation due to electromagnetic radiation or response. The signal officer
has primary responsibility for spectrum management in his unit. EMC is just
one consideration under spectrum management.
The signal officer, in
coordination with the electronic warfare (EW) officer, establishes and
maintains a joint restricted frequency list.
That list is based on G3/S3
reports and priorities.
2.
Electromagnetic Interference. EMI is any electromagnetic disturbance
that interrupts, obstructs, degrades, or limits the performance of
electronic or electrical equipment. It can be natural, man-made, or mutual
interference.
a. Natural interference has four categories (Figure 3-1).
They are
atmospheric, solar and cosmic, precipitation static, and fading.
Natural
interference affects most frequencies with its effects decreasing as the
frequency increases.
Figure 3-1.
(1) Electrical
storms
in
the
atmosphere
cause
atmospheric
interference.
(2) Eruptions
on
the
sun
or
other
stars
cause
solar
and
cosmic
interference.
(3) Charged particles in the atmosphere cause precipitation static
interference.
SS0135
3-2
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