7.
Summary.
a. EMC involves predicting and controlling interference.
It results in
signal systems operating without unacceptable degradation.
b. EMI is a disturbance that interrupts, obstructs, degrades, or limits
the performance of electronic or electrical equipment. It can be natural,
man-made, or mutual interference.
(1) Natural interference has four categories.
They are atmospheric
solar and cosmic, precipitation static, and fading.
(a) Electrical
storms
in
the
atmosphere
cause
atmospheric
interference.
(b) Eruptions on the sun or other stars cause solar and cosmic
interference.
(c) Charged particles in the atmosphere cause precipitation static
interference.
(d) The medium through which radio waves are propagated causes
fading interference.
(2) Man-made interference is caused by electrical devices.
EW is
also a form of man-made interference.
another.
c. EMP is caused by a nuclear
detonation.
It
can
damage
signal
equipment by intense gamma radiation.
d. Radio operations in unusual climatic and atmospheric conditions pose
special and unique situations for operators.
3-9
SS0135
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